EFFECT OF SINTERING TEMPERATURE ON DIFFUSE PHASE TRANSITION OF BARIUM ZIRCONATE TITANATE CERAMICS

ABSTRACT

The crystal structure, surface morphology and dielectric properties of BaZr_0.2Ti_0.8O₃ ceramics sintered at 1250°C, 1300°C and 1350°C for 4 h in air atmosphere were investigated. The BZT ceramics sintered at 1250°C, 1300°C and 1350°C possess a pure perovskite structure and no secondary phase is observed. As the sintering temperature increased, the average grain size of the BZT ceramics increased. The temperature dependence of the dielectric constant was studied and the diffuse transition behavior is enhanced with the increase of sintering temperature.

Keywords:

• BaTiO₃ and titanate
• ceramics
• sintering temperature
• diffuse phase transition

ACKNOWLEDGMENT

This research is supported by the Science and Technology Research Project of Chongqing Education Committee the Research Foundation of Education Bureau of Chongqing, China (Grant No. KJ081411), and the Chunhui Program, Ministry of Education of China (Grant No. Z2007-1-63013).