Mr. O. V. Saravanan

Mr. O.V. Saravanan, Assistant Professor
Research Centre and PG Department of Physics
The Madura College (Autonomous), Madurai – 625 011
Mobile: +91 90439 38284,

Ph.D. topic:

Synthesis and characterization of solid solutions of NaBiTiO3 based lead-free ceramic materials

Date of Registration : 23/02/2018
Registration no. : P5212
Date of viva voce examination :

About the topic:
Perovskite type materials with general formula ABO3 have attracted much research interest due to their interesting crystal structure, symmetry, excellent piezoelectric, ferroelectric, dielectric properties and wide range of industrial applications. Na0.5Bi0.5TiO3 (NBT) ceramic materials have been devoted special attention from the view point of environmental safely, fabrication process and electro mechanical properties.

For the next generation lead-free piezoelectric ceramic applications, NBT is considered as one of the most promising materials. It has strong ferroelectricty and high Curie temperature. But, its low depolarization temperature below 200°C and coercive field limit its application range. In addition to, these facts, the evaporation of bismuth at high sintering temperatures is believed to increase the conductivity of the material and make it difficult to pole.

For improvement of poling process and the corresponding piezoelectric response, the NBT ceramic materials are synthesized by adding other perovskite ceramics. In the proposed Ph. D. Research work, the structure and electrical properties of lead-free ceramic solid solution of NBT will be synthesized and characterized.


  1. Na5Bi0.5TiO3 - SrTiO3
  2. Na5Bi0.5TiO3 - CaTiO3
  3. Na5Bi0.5TiO3 - BaZrO3
  4. Na5Bi0.5TiO3 – SrZrO3
  5. Na5Bi0.5TiO3 - BaSrTiO3
  6. Na5Bi0.5TiO3 - BaTiO3 - SrTiO3

List of publications:

Electronic structure and bonding interactions in Ba1-xSrxZr0.1Ti0.9O3 ceramics, 
Jegannathan Mangaiyarkkarasi, Subramanian Sasikumar, Olai Vasu Saravanan, 
and Ramachandran Saravanan, 
Frontiers of Material Science, Springer, 11, 182–189 (2017), 
(Impact Factor = 1.701).
Investigation on interatomic chemical bonding and charge-related optical, 
multiferroic properties of La1−xZnxFeO3 bulk ceramics. 
G.Gowri, R.Saravanan, N.Srinivasan, O.V.Saravanan, S.Sonai
Materials Chemistry and Physics (Elsevier), 267, 124652 (2021)
(Impact Factor = 3.408) 
Charge Density Analysis, Structural, Electrical and Magnetic Studies of 
(1-x)BaTiO3+NiFe2O4 Ceramic Composite
S.V. Meenakshi, R. Saravanan, N.Srinivasan, O.V.Saravanan, 
D.Dhayanithi, and Nambi Venkatesan Giridharan,
J.Electronic Materials (Springer), 49,7349–7362 (2020)  
DOI: 10.1007/s11664-020-08481-4
(Impact Factor= 1.774)