Mrs. G. Gowri

Ms. G. Gowri, Assistant Professor, Research Centre and PG Department of Physics,
The Madura College, Madurai- 625 011
Mobile: 99445 68916, 
Email: gowrikanna01@gmail.com

Ph.D. topic:

Synthesis, characterization and charge density of multiferroic materials

Date of Registration : 19/12/2015
Registration no. : P4287
Date of viva voce examination :

About the research work:
The research work focuses on the Synthesis, characterization and charge density of multiferroic material. Since the magnetic and electric properties coexist in the multiferroic material, it will be of interest to synthesis and characterize it. The structural, optical, magnetic and the electric properties of the multiferroic material can be altered by doping divalent or trivalent or tetravalent ions at the host lattice site.

The pure and doped LaFeO3 multiferroic materials such as i) La1-xAlxFeO3 ii) La1-xCexFeO3 iii) La1-xSrxFeO3 have been synthesized through high temperature solid state reaction method and La1-xZnxFeO3 has been synthesized by chemical co-precipitation method.

Characterization techniques such as, powder X-ray diffraction (PXRD), Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), UV-Vis spectra and dielectric measurement have been used to analyze the effect of various dopants (Zn2+, Sr2+, Al3+, and Ce4+) on structural, surface morphological, elemental composition, optical and polarization properties. The structural analysis has been done through Rietveld refinement process using JANA2006 software. The charge density and interatomic bonding analysis in the unit cell have been investigated through high resolution maximum entropy method (MEM) by employing the softwares PRIMA and VESTA. The magnetic and electric properties have been investigated by recording the magnetization–magnetic field (M-H) hysteresis loop and the polarization–electric field (P–E) hysteresis loop, using VSM and P-E loop tracer. The optical behavior, polarization behavior, magnetic ordering and electric ordering have been correlated separately with the experimental charge densities which have not been done so far.

Materials Interest:

Ceramic materials, multiferroic materials, dielectric and magnetic materials

List of Publications:

1.
Charge Density of Al Doped Lanthanum Orthoferrites, Novel Ceramic materials,
R. Saravanan, G. Gowri,
Materials Research Forum, LLC, Materials Research Foundation, USA, 
Chapter  9, Vol.  2,   108 - 127, (2016), ISBN : 978-1-945291-02-9.
2.  
Bonding in La0.9Zn0.1FeO3 multiferroic material, Contemporary dielectric materials,
G. Gowri, R. Saravanan, R. Pradeepa, M. Raja Rajeswari, K. Abirami,
Materials Research Forum, LLC, Materials Research Foundations, USA, 
Chapter 6, Vol.7, 63-78, (2017), ISBN: 978-1-945291-12-8.
3.
Interatomic bonding and charge ordering in superpramagnetic La0.8Zn0.2FeO3 
multiferroic,
G. Gowri, R. Saravanan,
International Journal of Latest Trends in Engineering and Technology,
Special Issue - International Conference on Nanotechnology: The Fruition 
of Science-2017, pp.144-150, 2017.
4.
Exchange bias effect, ferroelectric property, primary bonding and charge 
density analysis in La1-xCexFeO3 multiferroics, 
G.Gowri, R.Saravanan, S.Sasikumar, I.B.ShameemBanu,
Materials Research Bulletin, 118, 110512, (2019) 
MRB - 2019 (Impact Factor = 3.355)
(Materials Research Bulletin - Info)
5.
Interatomic chemical bonding and charge correlation of optical, magnetic
and dielectric properties of La1-xSrxFeO3 multiferroics synthesized by 
solid state reaction method
G.Gowri, R.Saravanan, S.Sasikumar, M.Nandhakumar, R.Ragasudha 
Journal of Materials Science : Materials in Electronics, 30, 4409-4426, (2019) 
JMSE - 2019 (Impact Factor = 2.195)
(Journal of Materials Science : Materials in Electronics - Info)
6. 
Communicated 1
7. 
Communicated 2