SrCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ) perovskite stabilized by niobium for oxygen permeation  

作　　者：Wang, Haihai  Zhang, Yuwen  Geng, Zhen  Zhang, Qifei  Gai, Yongqian  Ding, Weizhong 

机构地区：[1]Shanghai Key Laboratory of Modern Metallurgy and Materials Processing,Shanghai University,Shanghai 200072,China

出　　处：《Rare Metals》2012年第4期392-396,共5页稀有金属（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 51174133);the National High Technology Research and Development Program of China(No. 2006AA11A189);the Science and Technology Commission of Shanghai Municipality (No. 11ZR1412900)

摘　　要：The effect of Nb doping on the oxygen permeation and stability of SrCo_(0.8)Fe_(0.2)O_(3-δ)(SCFO) was investigated comprehensively.Cubic perovskite phase was formed in SrCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ)(SCFNO).The SCFNO with a thickness of 1 mm had a high level of oxygen permeation flux of 1.4 ml.min^(-1).cm^(-2) at 850 ℃ under air/He gradient.The bulk diffusion is the rate-limiting step in overall oxygen permeation mechanism for SCFNO when the thickness is higher than 1.0 mm.The partial substitution of Nb for Co suppresses the transition of oxygen vacancies order/disorder proven by DSC measurement and enhances the phase stability under low oxygen partial pressure.During long-term tests under low oxygen pressure,the SCFNO exhibites structural stability and stable oxygen permeation.It is proved that substitution of Nb for Co is an effective way to improve the properties of SCFO.

关 键 词：SrCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ)(SCFNO) oxygen permeability structural stability 

分 类 号：O6[理学—化学]