(1-x)Pb(Sc_(1/2)Ta_(1/2))O_3x-PbTiO_3陶瓷的结晶特性与介电性能研究

Research on the Crystalline and Dielectric Propertiesof (1-x)Pb(Sc_(1/2)Ta_(1/2))O_3x-PbTiO_3Ceramics

在钽钪酸铅中加入钛酸铅,形成具有复合钙钛矿结构的钽钪酸铅 钛酸铅固溶体(1-x)Pb(Sc1/2Ta1/2)O3 xPbTiO3(简称PSTT(x)),可有效提高钽钪酸铅材料体系的居里点、降低其制备温度,从而扩大PST体系的应用范围.用常规氧化物合成电子陶瓷方法制备了钽钪酸铅 钛酸铅弛豫铁电陶瓷,采用XRD,SEM等分析技术,研究了PSTT(x)陶瓷的结晶特性和微观形貌,测试了PSTT(x)陶瓷的介电性能.实验结果表明,利用常规氧化物合成电子陶瓷方法可以合成钙钛矿结构的PSTT(x)陶瓷,其钙钛矿相的含量可达到90%以上,最高达100%.SEM分析表明,PSTT(x)陶瓷的晶粒饱满、晶界清晰.PSTT(x)陶瓷的热滞温度随x的不同,大致在6～12℃之间变化;PSTT(x)陶瓷的居里常数C 为3.7～8.3×106K2.

It was found that when lead titanate added into lead scandium tantalate to form lead scandium tantalate-lead titanate solid solution (1-x)Pb(Sc1/2Ta1/2)O3-xPbTiO3 (abbr. PSTT(x)) with the complex perovskite structure, the Curie temperature of the lead scandium tantalate system could be increased, and their sintering temperature could be decreased. So that the application fields of the PST system could be enlarged. The lead scandium tantalate -lead titanate ceramics was prepared using the conventional oxide electric ceramics process method. The crystalline property and morphology of the PSTT(x) ceramics were characterized by XRD, SEM analysis techniques. The dielectric properties of the PSTT(x) ceramics were measured. The experimented results showed that the PSTT(x) ceramics with the perovskite structure could be prepared by using the conventional oxide electric ceramics process method. The percent of the perovskite structure of the PSTT(x) ceramics could be as high as 90%, the highest was 100%. The SEM observation showed that the crystalline grains of the PSTT(x) ceramics were well-stacked and the grain boundaries were well clear. The thermal hysteretic temperature of the PSTT(x) were changed from 6 ℃ to 12 ℃ with different x concentration. The Curie constants of the PSTT(x) ceramics were 3.7～8.3×106 (K2).