无机材料学报

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掺有过渡金属氧化物的氧化铁系统陶瓷的气敏特性

贺蕴秋; 解庆红   

  1. 同济大学材料工程系; 上海200433
  • 收稿日期:1995-12-11 修回日期:1996-01-31 出版日期:1997-02-20 网络出版日期:1997-02-20

Gas Sensitivity of Ferric Oxide Ceramics with Transition-Metal Oxide

HE Yunqiu; XIE Qinghong   

  1. Department of Materials Engineering; Tongji University Shanghai 200433 China
  • Received:1995-12-11 Revised:1996-01-31 Published:1997-02-20 Online:1997-02-20

摘要: 掺有过渡金属氧化物的氧化铁系统陶瓷在不同温度下烧结,如CuO-Fe2O3和ZnO-Fe2O3系统,形成α-Fe2O3和含有铁空位的尖晶石晶相.材料对还原气体具有显著的气敏性.尖晶石相和其中的铁空位浓度随组成和烧结温度而变化.文章认为材料的气敏性因铁空位而产生,并随铁空位浓度增加灵敏度上升.

关键词: 气敏性, 铁空位, 固溶体

Abstract: The ferric oaide system with transition metal oxides such as CuO-Fe2O3 and ZnO-Fe2O3, were Sintered at different temperatures and formed a porous ceramic with a-Fe2O3 and spinel crystal phases. This ceramic possesses a remarked sensitivity to reductive gases. The special property is considered to relate to the ferric vacancy coccentration in a spinel phase. The ferric vacancy concentration varies with composition and heating temperature. The gas sensitivity can be improved by the increment of the ferric vacancy concentration.

Key words: gas sensitivity, ferric vacancy, solid solution