以碳酸钡、二氧化钛、二氧化锆等为主原料，以氧化钆为掺杂剂，采用传统固相法分别于1250，1280，1300，1330℃下制备了BaZr0.1Ti0.9O3(BZT)+xGd2O3(0≤x≤0.7%)陶瓷样品。XRD结果表明，Gd3+掺杂后的陶瓷样品主晶相不变，均为钙钛矿结构。SEM结果表明，随着Gd3+掺杂量的增加，陶瓷的晶粒尺寸先减小后增大。陶瓷样品的体积密度和介电常数在x=0.2%，0.6%时出现较高值，介质损耗tanδ随Gd3+掺杂量的增大呈减小趋势。Gd2O3掺杂改善了BZT陶瓷的介电温度特性，具有一定的移峰与压峰的作用。%BaZr0.1Ti0.9O3(BZT)+xGd2O3(0≤x≤0.7%) ceramics were prepared by solid state method at the temperature of 1 250, 1 280, 1 300, 1 330℃, respectively. Barium carbonate, zirconium dioxide, titanium dioxide were used as main raw materials, and gadolinium oxide was used as the dopant. X-ray diffraction results reveal that the main crystal phase of the ceramic sample with the Gd3+ doping doesn’t make any change, which is still the perovskite structure. SEM observation shows that, with the increase of Gd2O3 addition, the grain size of the ceramic decreases firstly, and then increases. Whenx=0.2%, 0.6%, the volume density and permittivity appear a higher value and the dielectric loss shows a trend of decreasing. Gd2O3 doping can improve the dielectric temperature change rate of the BZT ceramics.
展开▼
