Electrical Properties and Grain Growth Kinetics of PZN-based Ceramics Using Microwave Sintering
Effectiveness of microwave sintering process through investigation of microstructural characteristics and electrical properties of x(0.94PbZn1/3 Nb2/3O3 + 0.06BaTiO3) + (1 - x)PbZryTi1-yO3 (PBZNZT) ceramics with x = 0.6 and y = 0.52 was evaluated. The relative density of 95％ was achieved with sintering at 800℃ for 2 h. The small grain growth exponents indicate how easy the grain growth in these materials sintered using microwave radiation. Grain growth rate increases abruptly and is higher than that of conventional sintering at a temperature higher than 1050℃. This is attributed to the lower activation energy and higher grain boundary mobility. The activation energy required for the grain growth is found to be 132kJ/mol. Higher remanent polarization (Pr = 50.1μC/cm2) and increase in remanent polarization with sintering temperature are observed in microwave sintering process when compared to that of conventional sintering process,due to fast increase in grain growth rate and homogeneity in the specimen. The results indicate lower sintering energy and reduction of PbO pollution in the working environment by microwave sintering process.
sintering activation energy grain growth diffusion ferroelectrics
LI Chen-liang M. B. Suresh CHOU Chen-chia
国际会议
第二届功能原料国际研讨会(The 2rd International Symposium on Functional Materials)
杭州
英文
878-882,891
2007-05-16（万方平台首次上网日期，不代表论文的发表时间）