Synthesis, characterization and electrical properties of sol-gel derived 0.63Bi(Mg_1/2Ti_1/2)O₃-0.37PbTiO₃ high-T_c piezoelectric ceramics

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• 作者：Xun Ji ; Ruzhong Zuo ; ^{piezolab@hfut.edu.cn} ; Shishun Qi ; Longdong Liu
• 关键词：Ceramics ; Chemical synthesis ; Sol&ndash ; gel growth ; Sintering ; Microstructure ; Ferroelectricity ; Piezoelectricity
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：15 June, 2012
• 卷：134
• 期：2-3
• 页码：1179-1184
• 文件大小：997 K

摘要

The nano-scaled powders of a high Curie temperature piezoelectric system with a composition of 0.63Bi(Mg_1/2Ti_1/2)O₃-0.37PbTiO₃ (0.63BMT-0.37PT) have been synthesized via a citrate sol-gel method. The thermal decomposition process of the as-prepared xerogel was investigated through the thermo-gravitometry and differential scanning calorimetry. The lattice structure of the powders as the function of heat-treatment temperatures was explored by using X-ray diffraction, Fourier-transform infra-red and Raman spectra. The results indicated that the transparent gel could be obtained via the chelate reaction of citric acid with ethylene glycol and ethanolamine assist. Gels can be transformed into crystallite powders with a single-phase perovskite structure when heat-treated at 600聽掳C for 3聽h, much lower than that of traditional solid-state reaction method. The sol-gel derived 0.63BMT-0.37PT ceramics sintered at 1020聽掳C exhibit excellent dielectric, ferroelectric and piezoelectric properties of T_c聽=聽463聽掳C, , tan聽未聽=聽0.063, P_r聽=聽22.1聽渭C聽cm^鈭? and d₃₃聽=聽230聽pC聽N^鈭?. Moreover, a small amount of Mn²⁺ doping could cause the reduced leakage current and slightly increased T_c values.