摘要
采用甘氨酸燃烧法制备GDC（Gd2O3掺杂的CeO2）粉纳米体,研究了添加不同含量的Gd2O3（摩尔分数）对GDC烧结体的电性能的影响。结果表明：GDC纳米粉体的晶粒大小为30 nm左右,烧结性能良好,GDC纳米粉体的晶格常数随Gd2O3含量的增加而增大,3种GDC电解质在1 250℃烧结3 h后相对密度均超过97.0%。Gd2O3含量为15%的GDC电导率在低于700℃时最大,且氧离子活化能最小,迁移焓最小为0.593 e V。Gd2O3含量为10%的GDC电解质氧空位从团簇中解离成为自由氧空位的临界温度点为550℃,15%和20%的GDC临界温度点为600℃。
GDC（Gd2O3 doped CeO2） nanopowders were synthesized by a glycine combustion method, and the effect of gadolinium content on the electrical properties of GDC sintered body was investigated. The results indicate that the grain size of GDC nanopowder is approximately 30 nm, and the optimum sintering properties are obtained. The lattice parameter of GDC nanopowder increases with the increase of Gd2O3 content, and the sintered body of GDC with a relative density of 〉 97% can be obtained after sintering at 1 250 ℃ for 3 h. When the Gd2O3 content is 15%（mole fraction）, the conductivity of GDC is the maximum at 〈 700 ℃, and the activation energy of oxygen ion is 0.593 eV. The oxygen vacancies in the GDC electrolyte with Gd2O content of 10% dissociate from the clusters into free oxygen vacancies, and the critical temperature point is 550 ℃. The critical temperature point of GDC with Gd2O3 contents of 15% and 20% is 600 ℃.
作者
程亮
罗凌虹
徐序
石纪军
吴也凡
CHENG Liang, LUO Linghong, XU Xu, SHI Jijun, WU Yefan(Jingdezhen Ceramic Institute, National Engineering Research Center for Domestic ＆ Building Ceramics, Key Laboratory of Fuel Cell Materials and Devices, Jiangxi Province, Jingdezhen 333001, Jiangxi, Chin)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2018年第3期354-360,共7页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(51662015
51462011)
江西省教育厅科技落地计划(KJLD13072)资助
关键词
氧化钆掺杂的二氧化铈
电导率
活化能
氧空位缔合
gadolinia doped ceria
electrical conductivity
activation energy
oxygen vacancy association
