THERMAL, MICROSTRUCTURE AND DIELECTRIC BEHAVIOR OF LA-MODIFIED BISMUTH TITANATE CERAMIC

Nagbasavanna Sharanappa, Chandrashekhar M. Tavade, R L Raibagkar

Abstract: Environmentally safe and lead free La-modified bismuth titanate (BLT) was synthesized by conventional solid state reaction method. The thermal, dielectric, Microstructural behaviors of BLT ceramic have been investigated. Based on the thermal stability of BLT, samples were calcined at 7500 C, percentage weight loss and thermal behavior was studied by TGA/DSC. The influence of La on crystal structure of BLT showed orthorhombic crystal structure. Increase of La concentration does not show a secondary phase. Among all the La-doped BLT ceramic samples, x = 0.60 exemplified good results. Dielectric permittivity of BLT is higher at x = 0.60 comparing to other, microstructure study of sintered ceramic sample showed plate-like shape with enhanced density. The results show that the La3+ doped BLT ceramics may be used as a probe for the phase transition of the ferroelectric materials.

Keywords: La-substituted bismuth titanates, Thermal, Microstructure, Dielectric.

DOI: https://doi.org/10.15623/ijret.2014.0305134