Volume : 5, Issue : 10, October - 2016

RAMAN SPECTROSCOPY STUDY OF IMPURE BISMUTH SODIUM TITANATE

Aloke Verma

Abstract :

<p>&nbsp;Bismuth sodium titanate, Bi0.5Na0.5TiO3 (BNT) is one of the important ferroelectrics among the lead- free piezoelectric materials with large remnant polarization (Pr = 38 &mu;C/cm2), high Curie temperature (Tc = 320&deg;C), and shows diffuse phase transition (DPT) with perovskite structure. In addition to the DPT, two more phase transitions were reported at 230&deg;C and at 500-600&deg;C. It is observed the coexistence of the cubic and the tetragonal phases in the temperature ranges from 500&deg;C to 540&deg;C, and the tetragonal and the rhombohedral phases from 255&deg;C to 400&deg;C. Raman spectroscopic studies were done on lead-free antimony doped BNT in order to understand the effect of antimony in their local structure and symmetry</p>