中文摘要：

采用溶胶-凝胶方法制备不同组分的（1-x）Ba（Zr0.2Ti0.8）O3-x（Ba0.7Ca0.3）TiO3（BZT-xBCT,0.3≤x≤0.7）纳米粉体并进行常压烧结,研究了BZT-xBCT粉体、陶瓷的结构及其电学性能。结果表明：溶胶-凝胶方法合成的BZT-xBCT粉体具有单一钙钛矿结构,晶粒细小均匀（约为50nm）。与常规固相反应法相比,溶胶-凝胶方法提高了BZT-xBCT粉体的烧结活性,烧结后的陶瓷致密度高（密度〉5.46g/cm^3）,且具有优异的电学性能（BZT-0.5BCT陶瓷的压电系数d33=465pC/N、最大介电常数εmax=8450、剩余极化强度2Pr=23.40μC/cm^2）。不同组分的BZT-xBCT陶瓷均表现出介电弛豫现象,随着BCT组分的增加,其Curie温度逐渐升高。

英文摘要：

Nano-powders of （1-x）Ba（Zr0.2Ti0.8）O3-x（Ba0.7Ca0.3）TiO3（BZT-xBCT, 0.3≤x≤0.7） with different compositions were synthesized by a sol-gel method and further densified by pressureless sintering. The structure and electrical properties of BZT-xBCT powders as well as the ceramics were investigated. All the BZT-xBCT powders appear a pure perovskite structure, and the particle size is 50 nm. Compared to the solid-state reaction, the sol-gel method can enhance the sinterability of BZT-xBCT powders, and the compact structures with densities of higher than 5.46 g/cm^3 can be obtained. As a result, the BZT-xBCT ceramics exhibit the better electric properties （for BZT-0.5BCT, d33=465 pC/N, εmax=8 450, 2Pr=23.40 μC/cm^2）. All the BZT-xBCT ceramics show relaxation phenomena, and the Curie temperature shifts to the high-temperature range when the BCT composition increases.