Acceptor Doped BiFeO3 Ceramics: A New Material for Oxygen Permeation Membranes
Acceptor Doped BiFeO3 Ceramics: A New Material for Oxygen Permeation Membranes
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DOI：
10.1143/jjap.46.l93
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发表时间：
2007-01
影响因子：
1.5
通讯作者：
K. Brinkman;T. Iijima;H. Takamura
中科院分区：
文献类型：
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作者：
K. Brinkman;T. Iijima;H. Takamura
在铁酸铋（BiFeO 3）中掺杂受主元素，制备了一种新型的中温混合导电材料。研究发现，在5摩尔%的水平上掺杂Ca或Sr的受主可以使陶瓷的最高工作温度提高100 °C以上，并消除了纯BiFeO 3系统中经常报告的第二相形成。通过测量掺杂陶瓷的氧渗透性质来确认混合的离子和电子电导率，所述掺杂陶瓷在800 °C下在0.21 atm（空气）至10-6 atm（He）的氧分压范围内表现出约0.018 μmol/（cm 2 s）的通量。陶瓷膜的氧通量随着样品厚度的减小而增加，表明该体系具有良好的表面催化性能。
A new intermediate temperature mixed conducting material has been fabricated based on acceptor doping of bismuth ferrite (BiFeO3). Acceptor doping at levels of 5 mol % with either Ca or Sr was found to increase the maximum operating temperature of ceramics by more than 100 °C as well as eliminate secondary phase formation often reported in the pure BiFeO3 system. Mixed ionic and electronic conductivity was confirmed by measuring the oxygen permeation properties of doped ceramics which exhibited flux's on the order of 0.018 µmol/(cm2 s) at 800 °C over the oxygen partial pressure range 0.21 atm (air) to 10-6 atm (He). Ceramic membranes showed an increase in oxygen flux with decreasing sample thickness indicating good surface catalysis properties of the system.