RAMAN - 2022 - Initial Souvenir

CONTENTS Pg. No. RAMAN - 2022 1 Title 2 1. Message from the Director General 3 2. From the Director’s Desk 3. Address by the Chief Guest 4 – 17 4. Invited Talks 17 - 26 5. Abstracts International Conference on “Recent Advancements in Materials science And Nanotechnology”, 2022

Message from the Director General RAMAN - 2022 To begin with, I would like to offer my heartfelt appreciation to the RAMAN-2022 organizers for hosting an international conference on the theme 'Recent Advancement in Materials science and Nanotechnology' during 04-05 February 2022. The realm of knowledge is enormous. Even a minuscule piece of it to comprehend Dr. Anup K Singh individually leads to perplexity. Therefore, the Director General, significance of conferences such as RAMAN, Nirma University where individuals from all over the world come together to discuss their ideas, is paramount. This exchange of novel ideas benefits society by broadening the scope of research and development. Science and technology have played a pivotal role in the evolution of mankind. This international conference on the emerging trends in the realm of materials science and nanotechnology will undoubtedly contribute to a novel body of knowledge and so to the advancement of civilization. I am confident that erudite participants from diverse disciplines of science and technology would endeavour together to make the conference a grand success. My wholehearted support and wishes are with RAMAN-2022. Dr. Anup K Singh (Director General) International Conference on “Recent Advancements in 1 Materials science And Nanotechnology”, 2022

From the Director’s Desk RAMAN - 2022 Greeting to all the delegates of RAMAN 2022! The International Conference on Recent Advancements in Materials Science And Nanotechnology (RAMAN- 2022) aims at research-based innovations in the fields of Materials science and Nanotechnology. It Dr. R N Patel would provide an excellent opportunity for Director, Academicians, Researchers, Technocrats, and Students. Institute of Technology, Nirma University The conference thus comes at an opportune time when there is a growing need for innovations in the fields of Materials Science and Nanotechnology. Such conference not only highlights the major trends in technology but also provides a forum for researchers to get together and share their work, validate their findings and explore opportunities to collaborate. I congratulate the Department of Electronics and Communication Engineering on their initiative in organizing this International Conference on areas which are of relevance today. I must also thank all the various committee members, contributors, reviewers, and volunteers for their support in organizing this event. Wishing the conference a grand success and that it proves to be educative and effective in all respects. Dr. R N Patel (Director) International Conference on “Recent Advancements in 2 Materials science And Nanotechnology”, 2022

Address by the Chief Guest RAMAN - 2022 I congratulate the Nirma University for organizing the international conference on Recent Advancements in Materials science And Nanotechnology jointly by the Department of Electronics and Communication Engineering and Faculty of Physics of the University. In the present difficult situation of the world hit by pandemic, it is an extremely encouraging and timely step forward, Prof. Tanusri Saha- overcoming the challenge of holding the entire Dasgupta conference in online mode. The topics covered are diverse in nature, covering frontier areas (Chief Guest) of research, spanning from nanomaterials, nanotechnology to energy storage devices, and experimental and theoretical condensed matter in general. Talks have been arranged to be delivered by experts, which will beneficial to a large community of students. I wish all success of the conference. Prof. Tanusri Saha-Dasgupta Senior Professor & Director APS fellow, FTWAS, FNA, FASc, FNASc, J.C. Bose National Fellow International Conference on “Recent Advancements in 3 Materials science And Nanotechnology”, 2022

Invited Talks 2D Nanomaterials for Energy Storage and Bio-Sensing RAMAN - 2022 Applications: Perspectives From DFT Simulations Brahmananda Chakraborty High Pressure & Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai-400085 Faculty, Homi Bhabha National Institute, Mumbai Email: [email protected] Various 2D nonmaterials have drawn immense attention as energy storage device (hydrogen energy & electro-chemical energy) due to their high surface area, high conductivity and high mechanical strength. Carbon nanostructures functionalized by transition metals are promising candidates for hydrogen storage media at ambient conditions. This presentation will describe Density Functional Theory (DFT) results on interaction, charge transfer mechanism and hydrogen storage capability of various 3d and 4d transition metals attached on various carbon nanostructure (graphene, graphyne, carbon nanotubes). This talk will also highlight electro-chemical energy storage performance of various graphene and transition metal oxides based hybrid structures, e.g., MoO3/RGO, WO3/RGO, CrVO4/RGO for making electrodes for supercapacitors. Recent synthesized 2D materials MXene and their hybrid structures are more promising for energy storage and water splitting applications. Some of our recent work on MXene based materials will be described. The increasing demand of glucose sensor has driven tremendous effort for the development of reliable, high precision and cost effective sensors. This talk will highlight DFT simulation results on the interactions and charge transfer mechanism of glucose and other bio- molecules on various nanostructured transition metal oxides, e.g, NiCo2O4, MnWO4, WO3 and Mo3 etc. Keywords: Graphene, Hydrogen Storage, Carbon Nanomaterials, MXene, Transition Metal dichalcogenides, Supercapacitors, Glucose Sensors. References: 1. Abhijeet Gangan, Brahmananda Chakraborty*, Lavanya M. Ramaniah and Srikumar Banerjee, International Journal of Hydrogen Storage, 44, 16735 (2019) 2. Sushanta K. Das,. .Suddhasatwa Basu, Brahmananda Chakraborty*and Bikash Kumar Jena *, Carbon 149 (2019) 307-317. 3. A. Yadav, …Brahmananda Chakraborty, L. M. Ramaniah, R. Fernandes, A. Miotello, M. R. Press and N. Patel, CARBON, 143, 51-62, 2019. 4. Brahmananda Chakraborty, P. Modak and S. Banerjee, J. Phys. Chem. C, 116, 22502−22508 (2012). 5. A. Yadav, Brahmananda Chakraborty*, Abhijeet Gangan ,Nainesh Patel, M.R. Press and L. M. Ramniah Journal of Physical Chemistry C, 2017, 121 (31), pp 16721–16730. 6. Satyajit Ratha, .. Brahmananda Chakraborty Bikash Kumar Jena, Chandra Sekhar Rout, ACS Applied Materials & Interfaces 2017 9 (11), 9640-9653. 7. Naik, Kusha; .. Chakraborty, Brahmananda*; Rout, Chandra Sekhar*, ACS Applied Materials & Interfaces 2017 9 (28), pp 23894–23903. 8. Facile Production of Mesoporous WO3-rGO Hybrids for High-Performance Supercapacitor Electrodes: An Experimental and Computational Study, Samal, Rutuparna; Brahmananda Chakraborty*; Saxena, Manav; Late, Dattatray; Rout, Chandra Sekhar*, ACS Sustainable Chemistry & Engineering, 7, 2350, 2019 International Conference on “Recent Advancements in 4 Materials science And Nanotechnology”, 2022

Magnetic oxides: synthesis, characterizations and applications RAMAN - 2022 Rajshree B. Jotania Department of Physics, Electronics and Space science University school of sciences, Gujarat University Ahmedabad-380 009, Gujarat, India Email: [email protected] Ferrites are ceramics; magnetic oxides belong to ferro/ferromagnetic materials. There is increase interest in ferrites (both bulk and nano) because of their large applications. These materials are very important commercially and technologically. They are divided into four different types: Spinel, ortho, hexagonal (or hexa) and garnets. Ferrites can be synthesized using various experimental techniques like solid state, wet chemical, ball milling, hydrothermal, sol gel auto combustion, microemulsion, reverse microemulsion green synthesis etc. Nanostructured (show superparmagnetism) ferrites are used in biomedical sciences and biotechnology [1, 2] Hexaferrites are divided into six different types according to their crystal structure and chemical compositions: M (magnetoplumbite- Ba/Sr/Pb/Ca-Fe12O19), W (like BaFe12O27), Y (Ba2Co2Fe12O22), X (Ba2Co2Fe28O46), U (Ba4Co2Fe36O40) and Z (Ba3Co2Fe24O41). Hexaferrites are used as magnetic materials, data storage, magnetic recording, Radar absorbing materials, microwave components and devices (operating at GHz frequency) [3, 4] In the talk I would like to cover various aspects of synthesis, characterizations and applications of ferrites. References: 1. Modern ferrite technology, Alex Goldman, 2nd Edition, Springer 2. Spinel ferrites, Surendra K. Sharma, Springer 3. Hexagonal ferrites: A review of the synthesis, properties and applications of 4. Hexaferrite ceramics, Robert C. Pullar, Progress in Materials Science, 57 (7) 2012, 1191- 1334 5. Modern ferrites in Engineering, synthesis, processing and cutting-edge applications, Sabrina Arcaro, Janio Venturini, Springer International Conference on “Recent Advancements in 5 Materials science And Nanotechnology”, 2022

Quasi- 2 dimensional electron gas at non-stoichiometric RAMAN - 2022 CaxTayO3+δ/STO Anjana Dogra1,2, Sumit Kumar1,2, Biswarup Satpati3 , D S Rana4 , Sunil Ojha5 , C.S.Yadav, Bhasker Gahtori1,2 , J. J. Pulikkotil1,2 1 CSIR-National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi 110012, India 2 Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201002, India 3 Surface Physics & Material Science Division, Saha Institute of Nuclear Physics, Kolkata700 064, India 4 Indian Institute of Science Education and Research Bhopal, Bhopal 462066, India. 5 Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi, 110067, India 6 School of Basic Sciences, Indian Institute of Technology Mandi, Kamand, Mandi-175075, India In search of novel oxide heterostructures that display highly mobile two-dimensional charge transport at its heterointerface, we report the synthesis of non-stoichiometric CaxTayO3+δ epitaxial films on TiO2 terminated SrTiO3 (001)substrate. The layer-by-layer growth of the films was accomplished by the pulsed laser deposition (PLD) technique monitored by the in-situ Reflection high energy electron diffraction (RHEED). The highly crystalline and abrupt heterointerface is confirmed with high-resolution electron microscopy. The experiment shows that a quasi-two-dimensional electron gas (q-2DEG) in CaxTayO3+δ becomes effective only after 8 unit cell (uc) of the film-thickness (which is much higher than the 4uc that is reported in other oxide interfaces). The non-stoichiometry of epitaxial thin films, obtained from Rutherford backscattering measurements RBS and XPS, makes the origin mechanism quite complex with active role of lattice structure and disorder. The measured room temperature carrier concentration (ns) is found to be in order of 1013 cm-2 at the interface and carrier mobility (µH) of 4-7 cm2V- 1s-1. The study offers a new perovskite heterostructure for unraveling the q-2DEG phenomena towards a clear mechanism and futuristic applications. International Conference on “Recent Advancements in 6 Materials science And Nanotechnology”, 2022

Magnetism and Magnetocaloric effect in perovskites RAMAN - 2022 Prof. Dr. Mohamed Ellouze University of Sfax, Faculty of Sciences of Sfax, B.P. 1171-3072, Sfax, Tunisia Email: [email protected], [email protected] We present in this contribution a summary of magnetism that would be an introduction for persons that they don’t have any idea about history of magnetism. We will introduce also the magnetocaloric effect properties in perovskites in particularly manganites and also for other magnetic materials. Keywords: magnetic properties, Magnetic Entropy, perovskites International Conference on “Recent Advancements in 7 Materials science And Nanotechnology”, 2022

Studies on doped RFeO3 Perovskites RAMAN - 2022 D.G. Kuberkar Department of Nanoscience & Advanced Materials, Saurashtra University, Rajkot 360005. Email: [email protected] Research on Perovskite structured rare-earth orthoferrites RFeO3 (R =rare earth ion) has attracted the attention of material scientists owing to their unique low-temperature magnetic behavior and interesting dielectric properties across wide temperature range with the possibility of coexisting ferroelectric and magnetoelectric properties. These fascinating aspects make rare-earth orthoferrites a suitable candidate for applications in thin film capacitors, magnetic field sensors, memory-based devices, etc. Studies on the magnetic properties of RFeO3 are interesting due to the existence of different magnetic transitions governed by various interactions, such as, Fe-O-Fe, Fe- O-R and R-O-R, generally characterized by isotropic, antisymmetric and anisotropic – symmetric super exchanges. The weak interaction between R-O-R leads to the ordering of R3+ ions at low temperature (TRO), whereas, spin-reorientation and magnetization reversal occur below compensation temperature due to the Fe-O-R interaction. The exchange interaction between Fe3+ -ions leads to the antiferromagnetic ordering of Fe-ions at high temperature with Neel temperature (TN) in the range of 600–750 K. Hence, both the ions, R3+ and Fe3+, contribute to the total magnetization of the system. In this talk, I will summarize our results on the studies on the doped Er1-xLaxFeO3 (ELFO) (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) orthoferrites synthesized by co-precipitation method. The observed variation in magnetic behavior in these systems will be discussed. Colossal dielectric (CD) response is one of the unusual properties exhibited by RFeO3 (R = La, Pr and Sm). The results of our studies on crystal structure, electronic structure and dielectric response of ELFO orthoferrites will be presented. Effect of grain and grain boundary contribution on the dielectric behavior has been studied using complex dielectric permittivity measurements. The results of the investigations on the electronic structure modifications in ELFO using Soft X-ray Absorption Spectroscopy (SXAS) will be discussed in the light of observed CD behavior. International Conference on “Recent Advancements in 8 Materials science And Nanotechnology”, 2022

Nanoparticles: angels and demons RAMAN - 2022 Martin Desimone Universidad de Buenos Aires, Argentina In recent years, the knowledge about the biological, chemical and physical characteristics of nanoparticles has increased exponentially. Indeed, the global production of nanoparticles is continuously growing. In fact, nanoparticles have become essential and beneficial in many fields of application, including the improvement of the quality of human life. Indeed, the pandemic caused by COVID-19 motivated a race to develop vaccines to overcome the crisis generated and many of the developments are based on the use of NPs. In addition, drug delivery systems were designed to improve therapy efficacy as well as patient compliance. Nanoparticles have gained ground in the biomedical field for their biocompatibility and biodegradability, being themselves stable, thus enabling a variety of formulation designs for application in the pharmaceutical industry. However, on the other hand, its many uses inevitably lead to uncontrolled and exponential discharge into the environment. In this sense, it seeks to present the need to study the fate and effect of nanomaterials, which is important not only from the point of view of the possible use of nanoparticles in therapeutic formulations but also from the nanotoxicity that they can produce. In this sense, the functionalization of the surface of nanoparticles and green synthesis procedures emerge as a key factor that improves the delivery of therapeutic molecules and also reduces their toxicity. International Conference on “Recent Advancements in 9 Materials science And Nanotechnology”, 2022

Multiferroicity in Tb2BaNiO5: From Neutron Diffraction RAMAN - 2022 Perspective Sudhindra Rayaprol UGC-DAE Consortium for Scientific Research, Mumbai Centre, 246C, Common Facility Building, BARC Campus, Trombay, Mumbai – 400085 Email: [email protected] , [email protected] Materials using spin of electrons, in addition to charge has been the focus of studies in recent times owing to their immense potential in spintronic devices. Therefore, the materials exhibiting magnetism induced polarization or vice-versa has been at the core of search as multiferroic materials which can be used for spintronic applications. In this talk, we shall discuss the multiferroic properties of a Haldane spin-chain system Tb2BaNiO5 which is surprisingly large among its peers. Neutron diffraction studies, particularly the temperature dependent variation of the critical canting angles between Tb and Ni moments with respect to crystallographic c-axis throws some light on the correlation between magnetism and polarization in this compound. We shall also discuss how substitution of different cations at Tb, Ba and Ni site influence the magnetic structure and overall multiferroicity in this class of compounds. Keywords: Neutron Diffraction, Magnetism, Magnetic Structure, Structure-Property Correlations. International Conference on “Recent Advancements in 10 Materials science And Nanotechnology”, 2022

Role of Confinement on Phonon Transport RAMAN - 2022 Prafulla K. Jha* Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara-390002, India Email: : [email protected], [email protected] The research on graphene despite some serious drawbacks motivated the researchers to explore other two dimensional (2D) materials. The 2D materials are one of the most active areas of nanomaterials research due to their far reaching potential applications. So far monolayer of hexagonal boron nitride (h-BN), silicine, transition metal chalcogenides, phosphorene and many other have been synthesized or predicted. A significant impact for the development of nanodevices and nanoelectronics has been gathered by these 2D materials due to their astonishing electrical, optical and mechanical properties. The 2D materials are one-atom thick honeycomb lattice of elements and compounds. While most of the works on these 2D materials focus on the electronic properties, the recent studies focus on the phonon studies mainly to reveal whether monolayer honeycomb structures possess local minima on the Born-Oppenheimer surface. Furthermore, the transport properties of the materials play an important role in their applications. For application in thermoelectric energy (TE) conversion, one requires low lattice thermal conductivity of material simultaneously maintaining the high value of electrical conductivity. The TE figure of merit of ZT can be improved by optimizing the geometry size to decrease the lattice thermal conductivity. Thus systematic investigation of phonon transport properties for 2D materials is needed for which a detail phonon studies is essential. In this presentation, we report on density functional theory (DFT) simulations aiming to understand the phonon and phonon transport properties of two classes of materials, selected IV-VI mono-chalcogenides and boron nitride (BN) in bulk as well as 2D forms. The focus lies on the phonon dispersion of these two different classes of materials. While in the case of IV-VI chalcogenides, we have studied not only the phonon properties of GeSe and GeTe with pressure for selected three pressure dependent phases but also in 2D structure. A complete analysis of phonon dispersion curves and thermoelectric properties will be provided in context of structure and dimension. The other material which we choose is the haeckelite BN (heck-BN) sheet a material similar to the h-BN sheet, the second most important material in the 2D materials category after graphene. The heck-BN sheet is a new form of structure in 2D, demonstrated based on the presence of square-octagonal pair in BN monolayer grown on Cu (111) surface. We discuss phonon dispersion curve and phonon transport properties of heck-BN and compare with other BN nanostructure including bulk BN. International Conference on “Recent Advancements in 11 Materials science And Nanotechnology”, 2022

Organic Electronics: Devises and Applications RAMAN - 2022 Nandu B. Chaure Professor in Physics Savitribai Phule Pune University (Formerly University of Pune), Pune 411 007, INDIA Email: [email protected] Phthalocyanine molecules are potential candidates for use as the organic semiconductor material in thin-film transistor structures. Inverted structure organic thin-film transistors (OTFT) were fabricated using spin-coated films of substituted copper phthalocyanine (CuPc) as the active semiconductor layer on pre-patterned octadecyl trichlorosilane (OTS) treated Si/SiO2 substrates. Plasma-enhanced chemical vapor deposited 250 nm thick SiO2 layer was used as the gate dielectric. Annealing temperature-dependent electrical, morphological, and structural properties were studied. OTFTs showed improved values of device parameters as the annealing temperature was increased to 100oC. The devices which were heat-treated at 100oC were found to exhibit high carrier mobility of 0.4cm2/Vs, an on/off current modulation ratio of ~107, a low threshold voltage of 2V, and a sub-threshold swing of 1.1 V/decade. The performance of the devices annealed at temperature 150 oC was reduced, probably due to the formation of very large crystalline grains (over 2microns) and associated layer discontinuity. The densities of trap states in the interfaces between the semiconductor and gate dielectric and the grain boundary region were evaluated by the method due to Levinson. The resulting values were found to be consistent with the observed annealing temperature-dependent performance of the field-effect transistors and with the measured surface morphology. Novel solution-processable phthalocyanine materials, coupled with optimal processing regimes, show excellent promise for the active layer in flexible transistor circuitry. International Conference on “Recent Advancements in 12 Materials science And Nanotechnology”, 2022

Solar Photovoltaic Trends & Sustainable Developments RAMAN - 2022 M.L.C. Attygalle Department of Physics, Faculty of Applied Sciences, University of Sri Jayewardenepura, Gangodawila, Nugegoda, Sri Lanka Email: [email protected] The global energy requirement has increased due to the development of technology and the increment of electricity usage. The low cost and higher efficiency renewable energy sources are popular all over the world to achieve the sustainable development following the roadmap. The global energy demand needs to follow the roadmap with economically feasible pathway for the development of carbon free technology towards a sustainable and clean energy future. The generation of electricity by using a renewable energy source, such as solar cell has received more attention due to the rapid developments of solar cell technologies and increment of solar cell efficiency. There are many Photovoltaic (PV) technologies. The first-generation technologies such as monocrystalline Silicon and polycrystalline Silicon based solar cells remain the principal driver of solar industry development and still hold most of the market value. The emerging multi- junctionand perovskite technologies also offer interesting perspectives; however, several barriers still need to be overcome. These new cell architectures have enabled higher efficiency levels. The adoption of advanced cell architecture is the most important solar PV trend leads the global market shift and as an example, Passive Emitter and Rear (PERC) solar cells are compatible with new innovations,and it is also more cost-effective as it allows energy output to be maximized due to more efficient energy conversion. The future trends of photovoltaic demand innovative solar technologies at the application level and across the globe several research projects and prototypes are going to stimulate future global market growth. Building integrated photovoltaic, Agri-voltaic, and Shadow-voltaic are some of the new application trends to drive the solar cell research aiming at multifunctionality, cost efficiency, versatility, and design flexibility. After three decades solar photovoltaic (PV) would represent the second-largest power generation source and lead the way for the transformation of the global electricity sector. Solar PV would generate 25% of total electricity needs globally, becoming one of prominent generations source by 2050 according to the International Renewable Energy Agency. Keywords: Photovoltaics, Thin-films, Sustainable developments, efficiency, Solar cell, Energy. International Conference on “Recent Advancements in 13 Materials science And Nanotechnology”, 2022

Porous Ceria Ceramics from Natural Templates and 3D RAMAN - 2022 Printing for Solar Thermochemical Production of Sustainable Fuels Robert Pullar Ca' Foscari University of Venice, Italy Email: [email protected] We are developing two novel forms of ceria for use in the thermochemical fuel production (TCFP) of renewable fuels using concentrated solar power (CSP), a concentrated beam of solar light capable of reaching up to 2000 ºC, to drive the reaction. The aim is to make renewable fuels from splitting water (to make hydrogen) or CO2 (to make CO which can then be used ti make synthetic fuels), powering the reaction using sunlight. The two forms of ceria are: 1. Biomorphic/biomimetic ceria ecoceramics made from cork templates. We convert cork into a pure ceria ceramic which maintains the highly porous 3DOM microstructure of cork, to create ceria catalysts for water splitting with improved efficiency. Cork is a renewable resource in itself, as the tree is not harmed in harvesting the cork bark each decade, and lives on as a carbon sink for a working life of over 200 years. Furthermore, we use by-products (waste powder) or recycled wine corks to make these materials. The cork is pyrolysed to carbon, infiltrated with a ceria precursor solution, and then converted to a pure ceramic at 1600 ºC, while maintaining the microstructure of the cork (~20 um hexagonal cells). We have tested this for the production of both H2 from water and CO (to make synthetic fuels) from CO2 using actual concentrated solar energy in a medium scale solar furnace at CNRS-PROMES, France. We have obtained excellent H2 and CO yields and among the highest reported fuel production rates, while using a smaller temperature swing (1450ºC to 1050 oºC) than that used by most other work in the Redox process, improving both speed and efficiency of fuel production. 2. 3D printed robocast and sintered ceria scaffolds have been produced for the first time, and these have been tested for CO and H2 production from the splitting of CO2 and water, with good preliminary results. International Conference on “Recent Advancements in 14 Materials science And Nanotechnology”, 2022

DFT modelling and Raman spectroscopy at pressures RAMAN - 2022 exceeding 1 GPa Dominik Kurzydłowski1* 1 Faculty of Mathematics and Natural Sciences, Cardinal Stefan Wyszyński University Email: [email protected] Pressures used in laboratories and industry rarely exceed 100 MPa (=0,1 GPa). However due to the development of new measurement techniques, in particular the diamond anvil cell (DAC), it is now possible to probe in situ materials at pressures exceeding 1 GPa, an even reaching 400 GPa. Experiments performed at high pressure enable observation of many intriguing phenomena, such as the transformation of nitrogen into a polymeric structure resembling that of diamond.1 By combining density functional theory (DFT) modelling and confocal Raman microscopy we were able to study the high pressure phase transformations in various inorganic fluorides (CuF2,2 ZnF2,3 AuF3,4 and NaZnF3 5 ), as well as organic hydrogen-bonded molecular crystals.6,7 The results of these studies provide a deeper understanding on some of the fundamental aspects of solid-state chemistry and physics, such as the Jahn-Teller effect, pressure- induced coordination changes, stabilization of low-oxidation states, van der Waals and hydrogen bonding interactions. Keywords: high pressure, diamond anvil cell, phase transitions, fluorides, hydrogen bond References: 1. M. I. Eremets et al. , Nat. Mater., 2004, 3, 558–563. 2. D. Kurzydłowski, Crystals, 2018, 8, 140. 3. D. Kurzydłowski, A. Oleksiak, S. B. Pillai and P. K. Jha, Inorg. Chem., 2020, 59, 2584– 2593. 4. D. Kurzydłowski, S. Kobyakov, Z. Mazej, S. B. Pillai, B. Chakraborty and P. K. Jha, Chem. Commun., 2020, 56, 4902–4905. 5. D. Kurzydłowski, A. Gajek and Z. Mazej, Phys. Rev. Mater., 2021, 5, 113602. 5. D. Kurzydłowski, T. Chumak and J. Rogoża, Crystals, 2020, 10, 920. 7. D. Kurzydłowski, T. Chumak, J. Rogoża and A. Listkowski, Molecules, 2021, 26, 3802. International Conference on “Recent Advancements in 15 Materials science And Nanotechnology”, 2022

Stealth Technology RAMAN - 2022 Charanjeet Singh School of Electrical and Electronics Engineering Email: [email protected], [email protected] This technology era has been growing exponentially in the field of warfare. The countries have developed various stealth devices to strength their defense line. The stealth aircrafts create camouflage creating invisible to the defense tracking system. This talk will be focused on different mechanism associated with stealth aircrafts which will include geometrical structure and materials. International Conference on “Recent Advancements in 16 Materials science And Nanotechnology”, 2022

Investigations on Structural and Magnetic Properties of Pb RAMAN - 2022 Doped NdMnO3 Dr. J. A. Bhalodia Associate Professor, Department of Physics, Saurashtra University, Rajkot – 360 005 (Guj.) India Email: [email protected] The Nd1-xPbxMnO3 with x ≤ 0.4 compounds were synthesized by an inexpensive modified sol-gel method. X-ray data were analyzed by using Rietveld refinement. The samples with x = 0.3 & 0.4 show the single-phase nature while the samples with x = 0.1 & 0.2 show the presence of minor extra developed NdMn2O5 phase with orthorhombic symmetry. Scanning Electron Microscographs show only slight variation in grain arrangement due to the variation of A-site cation (Pb-doping). Elemental presence and ratio were confirmed through the Energy Dispersive X-ray analysis. The magnetic properties studied by measuring dc magnetization through a vibrating sample magnetometer indicate the appreciable differences between zero-field cooled and field cooled profiles below the ferromagnetic to paramagnetic transition temperature ranging from 78 K to 192 K with increasing content of Pb doping. During the talk, the variation in structural and magnetic properties will be discussed in detail in the light of Pb concentration. International Conference on “Recent Advancements in 17 Materials science And Nanotechnology”, 2022