【作者】 符春林； 蔡苇； 邓小玲；

【Author】 FU Chun-lin,CAI Wei,DENG Xiao-ling (School of Metallurgical and Materials Engineering,Chongqing University of Science and Technology, Chongqing 401331,China)

【机构】 重庆科技学院冶金与材料工程学院；

【摘要】 研究了锆钛酸钡（简称BZT）粉体、陶瓷和薄膜的结构和介电、光伏性能。采用溶胶-凝胶法制备的BZT粉体的平均颗粒尺寸约为20 nm且随着煅烧保温时间、老化温度的增加而增大。与采用固相法制备的具有大晶粒尺寸相比,采用溶胶-凝胶法制备的BZT陶瓷具有较小的晶粒尺寸、较低的居里温度和介电常数、较大的介质损耗、较强的扩散相变特征。在BaZr_0.2Ti_0.8O₃陶瓷中,观察到鱼骨状、薄片形和"水印"电畴,而在大晶粒陶瓷中未发现90°畴。采用无机锆盐、溶胶-凝胶法制备的BaZr_0.2Ti_0.8O₃薄膜的介电常数和可调性分别为113和10.2%。BaZr_0.1Ti_0.9O₃薄膜具有明显的光伏特性,短路电流约为0.3μA。更多还原

【Abstract】 The microstructures,dielectric and photovoltaic properties of barium zirconate titanate（short for BZT） powders,ceramics and films were investigated.The average particle size of BZT powders prepared by solgel method is about 20 nm and increases with the increasing of the holding time and aging temperature.The BZT ceramics with smaller grain size prepared by sol-gel method have the lower Curie temperature and dielectric constant,the higher dielectric loss and the stronger diffuse phase transition than that of the ceramics with larger grain size prepared by solid state reaction method.In BaZr_0.2 Ti_0.8 O₃ ceramics domains with herribone,lamellar and "water-mark" characters are observed and 90°-domain has not been observed in large grain size sample.The dielectric constant and tunability of the BaZr_0.2 Ti_0.8 O₃ films using inorganic zirconate are 113 and 10.2%,respectively. There are obvious photovoltaic characteristics in BaZr_0.1Ti_0.9O₃ films and the short-circuit current is about 0.3μA.更多还原