RELAXOR BEHAVIOR OF BaZr_0.2Ti_0.8O₃ CERAMICS WITH DIFFERENT GRAINS

ABSTRACT

The surface morphology and dielectric properties of BaZr_0.2Ti_0.8O₃ ceramics sintered at 1350°C for 0.5 h, 4 h and 8 h in air atmosphere were investigated. As the sintering time increased, the average grain size of the BZT ceramics increased. The temperature dependence of the dielectric constant was studied and an enhanced diffuse phase transition behavior is found to be caused by the decreased grain size.

Keywords:

• ferroclectric properties
• grain size
• BaTiO₃ and titanates

ACKNOWLEDGMENTS

This work is supported by the National Science Foundation for Post-doctoral Scientists of China (Grant No. 20070410774), the Natural Science Foundation of Chongqing, China (Grant No. CSTC2007BB4212) and the Research Foundation of Education Bureau of Chongqing, China (Grant No. KJ071401).