Comparative study of properties of Barium Titanate synthesized by Solid State and Auto-combustion Method

Abstract

Barium titanate is a well-known ferroelectric and piezoelectric material with high permittivity (more than 1000) and one of the most widely used ceramic materials in the electric industry, especially in multilayer ceramic capacitors (MLCC). The current trend in MLCCs to increase the number of active layers to 200-400 and to lower the dielectric thickness below 2-3μm. To achieve this objective, ultrafine and non-agglomerate powders are required. Preparation methods significantly influence the purity, stoichiometry, particle size or microstructure of the BaTiO3 powder, which in turn influences the dielectric property of the compound. So, present situation is in a need of such a synthesis route which can produce barium titanate of expected particle size with a high permittivity and depressed Curie peak. In the current work, two synthesis routes, solid state synthesis and auto-combustion synthesis has been discussed along with the comparative study of properties of the powder obtained from both the methods.