Dr. Y.B.Kannan, M.Sc., M.Phil., CIC.,
Department of Physics, Arumugam Pillai Seethai Ammal College,
Tiruppattur – 630 211. Sivagangai Dt. Tamil Nadu, India.
Contact No. +91 8870787042
Synthesis and Characterization of Ferrite Materials
Date of Regis: 12.03.2011 Reg. No. P9315 Viva-Voce date: 28.09.2018
Introduction about research work:
Understanding the bond strengths requires an intense knowledge on charge density distribution. Hitherto, published research work reported the interactions between the tetrahedral (A) site and octahedral (B) site based on the values of interatomic distances and angles. There is not much work has been reported so far on bond strengths between atoms at A-site and B-site of ferrites by deploying maximum entropy method (MEM) techniques in the unit cell of ferrites. The advantage of employing MEM method is that this method can be used to determine the numerical values of the bond strength between various sites (A-A, A-B and B-B sites) instead of predicting the strengthening/weakening of the various sites interactions based on the interatomic distances and angles value, in the unit cell of ferrite. This motivated to carry out intense research on the bond strengths and other characterization on ferrites. The physical and chemical properties of atoms or molecules mostly depend on the charge density distribution, bond strength etc. Hence, in this doctoral work, the following samples were synthesized and studied for their bond strength between various sites (A-A, A-B and B-B sites) using MEM.
•Ni0.5Zn0.5Fe2O4 - sintered at 700°C to 1400°C.
•Mn0.4Zn0.6Fe2O4 & Co0.4Zn0.6Fe2O4
In this work, Rietveld refinement method was employed to refine the raw X-ray diffraction data using the software program JANA 2006 and Maximum Entropy Method (MEM) was used to evaluate the mid bond electron density values between the A-A, A-B and B-B site atoms in the unit cell of ferrite. PRIMA (Practice Iterative MEM Analyses) software, which is a MEM analysis program, was employed to evaluate the mid bond electron densities from the X-ray diffraction data and VESTA (Visualization of Electron/Nuclear densities and Structures) software was used to plot the 3D, 2D and 1D plot of electron densities in this doctoral work. Grain size of the samples synthesized in the present doctoral work was determined using the software GRAIN (Saravanan R, GRAIN software) written by Dr. R. Saravanan.
List of Publications 1. Synthesis and characterization of NiFe2O4 nano particles prepared by the chemical reaction method. Novel Ceramic Materials, ISBN: 978-1-945291-02-9, Materials Research Foundations, Published by Materials Research Forum, USA, LLC, Vol.2, Ch.11, 147-162, 2016., Y.B. Kannan, R. Saravanan, N. Srinivasan. 2. Synthesis and characterization of some ferrite nanoparticles prepared by co-precipitation method, Journal of Materials Science: Materials in Electronics, (Springer Publication), 27(11), 12000 – 12008, 2016. Impact factor: 1.798., Y.B. Kannan, R. Saravanan, N. Srinivasan, K. Praveena, K. Sadhana. 3. Study of various sites interactions using maximum entropy method on mechanically alloyed Ni0.5Zn0.5Fe2O4 nano ferrite particles sintered from 1100°C to 1400°C, Journal of Superconductivity and Novel Magnetism, Springer Publication, 30(2), 407-417, 2017. Impact factor: 1.100., R.Saravanan, Y.B. Kannan, N. Srinivasan, I. Ismail. 4. Sintering effect on structural, magnetic and optical properties of Ni0.5Zn0.5Fe2O4 ferrite nano particles Journal of Magnetism and Magnetic Materials, Elsevier, 423, 217-225, 2017. Impact factor: 2.357., Y.B. Kannan, R. Saravanan, N. Srinivasan, I. Ismail. 5. Structural, magnetic and optical characterization of Ni0.8Zn0.2Fe2O4 nano particles prepared by co-precipitation method, Physica B, Elsevier, 502, 181-186, 2016. Impact factor: 1.352., Y.B. Kannan, R. Saravanan, N. Srinivasan, K. Praveena, K. Sadhana. 6. Structural, Magnetic, Optical, and MEM Studies on Co-precipitated X0.4Zn0.6Fe2O4 (X = Co, Mn) Nanoferrite Particles Journal of Superconductivity and Novel Magnetism, Springer Publication, 30(9), 2673-2682, 2017. Impact factor: 1.100., Y.B. Kannan, R. Saravanan, N. Srinivasan, K. Praveena, K. Sadhana. 7. Effect of sintering on dieletric and AC conductivity properties of Ni0.5Zn0.5Fe2O4 nano ferrite particles. Journal of the Australian ceramic society, Springer Publication, 53(2), 577-581, 2017. Impact factor: 0.960., Y.B.Kannan, R.Saravanan, N.Srinivasan, I.Ismail.