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ABSTRACT
This paper deals with the systematic investigation of microstructure, optical and magnetic properties of Co doped CaSnO3 nanostructures prepared by hydrothermal route. Detailed structural analysis using XRD, FTIR and Raman analysis reveals the formation of orthorhombic CaSnO3 with pnma space group. Optical absorption studies authenticates the tuning of optical band gap upto 1eV was achieved by varying Co concentration in Ca-Sn-O lattice. Presence of oxygen vacancies and defects in the grown nanostructures were supported by PL and EPR studies. Room temperature M-H loops implies clear occurrence of room temperature ferromagnetism in all the Co doped nanostructures and the saturated magnetization (Ms) increases with increase Co doping. The magnetization behaviour was explained based on F-centre exchange interactions mediated by oxygen vacancies. The overall findings open up a pathway to tune the ferromagnetism as well as bandgap of stannate systems by varying the concentration of transition metal dopant’s.
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Sumithra
Dr. S. Sumithra.S received her doctorate in the field of materials science in the year 2018 from Anna University, College of Engineering, Chennai, Tamilnadu, India. Her research focus was on Investigation on physiochemical properties of dilute magnetic semiconductors She has proposed an R&D work and secured her own project from Indian government, under Women Scientist Scheme (WOS-A) of department of science and technology. Her current research focus is on morphologically or dimensionally controlled preparation, characterization and application of novel bio nanomaterials with different biocompatible dyes and to explore the one dimensional silica nanofibers embedded with magnetic as well as florescent materials by electrospinning technique and to conjugate them with bioassays to check their ability towards disease diagnosis from a single-molecule level to human body applications, from in vitro diagnosis to in vivo real-time imaging.
N. Victor Jaya
Dr Victor Jaya is a Professor at Department of Physics, Anna University, College of Engineering, Guindy, Chennai, Tamil Nadu, India. He received his Bachelor's degree in Physics from Christian College, Marthandam, Madurai Kamaraj University, (1981), M.Sc. in Physics from Christian College, Marthandam, Madurai Kamaraj University, (1983) and Ph.D. in Physics / Materials Science from Anna University, Guindy, Chennai (1988). He works in the field of the processing, properties and possible applications of composites, semiconductors of various nanostructures and high temperature superconductors. The characterization of these materials has been carried out using X-ray, Raman, AFM, AUGER and SEM. The synthesis, characterization and high pressure x-ray and electrical resistivity studies on GaN and nanomaterials. Established a high pressure and x-ray laboratory in which high pressure electrical resistivity can be measured at room temperature and at high temperatures. The high pressure x-ray diffraction using Diamond Anvil Cell with energy dispersive x-ray diffraction set was developed. With this facility it is possible to study the pressure temperature phase diagram of materials. A new facility is developed to prepare carbon nanotubes using arch method and synthesis of nanomaterials by ball mill method and sol gel method. He carried out work in the field of High pressure X-ray diffraction with Diamond Anvil Cell at Cornell High Energy Synchrotron Radiation Source (CHESS) at Cornell University, Ithaca, NY, USA. Designed and fabricated Diamond Anvil cell for High pressure X-ray diffraction and also Designed and fabricated Belt apparatus for high pressure and high temperature work (150 kbar, 1500K). He is the recipient of awards including: 1.Young Scientist Research grant from Department of Science and Technology, Govt. of India. 2. BOYSCAST fellowship from Department of Science and Technology, Govt. of India. He has organized fifth National Conference on high pressure science and technology during 1-3, March, 2001, at Anna University, Chennai, India. He has edited a book on Advances in High Pressure Science and Technology V Proceedings of the Fifth National Conference on High Pressure Science and Technology, Mar 1-3, 2000, Chennai, India. Published by Allied Publishers Limited, New Delhi. ISBN 81-7764-084-4. He has more than 100 publications in reputed journals and invited talks at different scientific meetings in India and abroad.