Dr. J. Mangaiyarkkarasi, Associate Professor,
PG and Research Department of Physics, N.M.S.S. Vellaichamy Nadar College
Mobile: 98429 56387,
Preparation and Structural Characterization of Dielectrics and Ceramic Materials
Date of Regis: 18.09.2009 Reg. No. P8545 Viva-Voce date: 06.07.2018
Introduction about Ph.D. work:
The main objective this work is the preparation and structural characterization of some important dielectric and ceramic materials. Five different doped BaTiO3 ceramic solid solutions viz., (i) Ba1-xSrxTiO3, (ii) BaTi1-xZrxO3 (iii) Ba1-x La2x/3TiO3 (iv) BaTi1-xCexO3 and (v) Ba1-xSrxTi0.9Zr0.1O3 have been synthesized by conventional high temperature solid state reaction method using tubular furnace.
The prepared samples have been characterized using powder X-ray diffraction (PXRD) and analyzed using the powder profile refinement technique by adapting the software JANA 2006, to examine the structural properties. Effects of various dopants (Sr, Zr, La, Ce and Sr & Zr (co-doping)) at the host lattice sites of BaTiO3 on the internal electronic structure, chemical bonding and charge density distribution have been examined through maximum entropy method (MEM) by using PRIMA and VESTA.
Optical band gap (Eg) values have been evaluated using UV-visible spectrophotometry (UV-vis). Microstructure and surface morphology are analyzed using scanning electron microscopy (SEM). Elemental compositions of the prepared ceramic systems are studied qualitatively and quantitatively by energy dispersive X-ray spectroscopy (EDS).
Dielectric and ceramic materials, semiconductors and magnetic materials
List of Publications:
1. Synthesis and analysis of electron density distribution in Ba1-xSrxTiO3 ceramics,
R. Saravanan, J. Mangaiyarkkarasi, Journal of Material Science: Materials in Electronics, (Springer Publication), Vol.27, issue 3, 2523-2533, (2016) (Impact Factor: 2.019).
2. Chemical bonding and charge density distribution analysis of undoped and lanthanum doped barium titanate ceramics,
J. Mangaiyarkkarasi, R. Saravanan, Mukhlis M Ismail, Journal of Chemical Science, (Springer Publication), Vol.128, No.12, 1913-1921, (2016) (Impact Factor: 1.235).
3. Effect of Ce addition on the electronic structure and bonding in BaTi1-xCexO3 ceramics,
J. Mangaiyarkkarasi, R. Saravanan, Journal of Material Science: Materials in Electronics, (Springer Publication), Vol.28, issue 3, 2624-2633, (2017) (Impact Factor: 2.019). 4. Electronic structure and bonding interactions in Ba1-xSrxZr0.1Ti0.9O3 ceramics,
J. Mangaiyarkkarasi, S. Sasikumar, O.V. Saravanan, R. Saravanan, Frontiers of Material Science, (Springer Publication), Vol.11, issue 2, 182-189, (2017) (Impact Factor: 1.471).
5. Charge distribution around Ba-O and Ti-O bonds in BaTi1-xZrxO3 through powder X-ray diffraction,
J.Mangaiyarkkarasi, R. Saravanan, Rare Metals, (Springer Publication), DOI: 10.1007/s12598-016-0812-6, (Impact Factor: 1.189) (Published online).
6. Chemical bonding and charge density imaging in Ba0.2Sr0.8TiO3 ceramics by iterative entropy maximization,
J. Mangaiyarkkarasi, R. Saravanan, Novel Ceramic materials, Materials Research Forum, LLC, Materials Research Foundations, USA, Chapter 1, Vol. 2, 1-13, May (2016), ISBN 13: 978-1-945291-02-9.
7. Ferroelectric charge ordering in BaTi0.9Zr0.1O3 lead-free ceramics through powder X-ray diffraction,
J. Mangaiyarkkarasi, R. Saravanan, Novel ceramic materials, Materials Research Forum, LLC, Materials Research Foundations, USA, Chapter 5, Vol.2, 56-68, May (2016), ISBN 13: 978-1-945291-02-9.