SrCo0.7Fe0.2Nb0.1O3−δ perovskite stabilized by niobium for oxygen permeation
SrCo0.7Fe0.2Nb0.1O3−δ perovskite stabilized by niobium for oxygen permeation
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DOI：
10.1007/s12598-012-0526-3
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发表时间：
2012-08
期刊：
影响因子：
8.8
通讯作者：
Haihai Wang;Yuwen Zhang;Zhen Geng;Qifei Zhang;Y. Gai;W. Ding
中科院分区：
文献类型：
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作者：
Haihai Wang;Yuwen Zhang;Zhen Geng;Qifei Zhang;Y. Gai;W. Ding
研究了Nb掺杂对SrCoFeO（SCFO）透氧性能和稳定性的影响。SrCoFeNbO（SCFNO）中形成立方钙钛矿相。在850 ℃空气/He梯度下，厚度为1 mm的SCFNO具有1.4ml· min· cm的高透氧通量。当厚度大于1.0 mm时，体扩散是SCFNO整体透氧机制中的限速步骤。通过DSC测量证明，Nb部分替代Co抑制了氧空位有序/无序的转变，提高了低氧分压下的相稳定性。在低氧压力下的长期测试中，SCFNO表现出结构稳定性和稳定的氧气渗透。研究表明，用Nb替代Co是提高超临界燃料油性能的有效途径。
The effect of Nb doping on the oxygen permeation and stability of SrCoFeO (SCFO) was investigated comprehensively. Cubic perovskite phase was formed in SrCoFeNbO (SCFNO). The SCFNO with a thickness of 1 mm had a high level of oxygen permeation flux of 1.4 ml· min· cm at 850 C 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.