共查询到1条相似文献,搜索用时 0 毫秒
1.
Xibao Li Zhijun Feng Jinshan Lu Fajun Wang Mingshan Xue Gangqin Shao 《Ceramics International》2012,38(4):3203-3207
Ce1?xGdxO2?x/2 (GDC) powders with different Gd3+ contents (x = 0.05–0.3) were prepared by a simple citrate–nitrate combustion method. The influence of the Gd3+ doping content on the crystal structure and the electrical properties of GDC were examined. Many analysis techniques such as thermal analysis, X-ray diffraction, nitrogen adsorption analysis, scanning electron microscopy and AC impedance analysis were employed to characterize the GDC powders. The crystallization of the GDC solid solution occurred below 350 °C. The GDC powders calcined at 800 °C showed a typical cubic fluorite structure. The lattice parameter of GDC exhibited a linear relationship with the Gd3+ content. As compared with that sintered at other temperatures, the GDC pellet that sintered at 1300 °C had a high relative density of 97%, and showed finer microstructure. The conductivity of GDC was firstly increased and then decreased with the increase of the Gd3+ content. The sintered GDC sample with the Gd3+ content of 0.25 exhibited the highest conductivity of 1.27 × 10?2 S cm?1 at 600 °C. 相似文献