中华医学超声杂志

应用化学 ›› 2009, Vol. 26 ›› Issue (11): 1328-1331.

• 研究论文 • 上一篇    下一篇

SrFe0.6Cu0.3Ti0.1O3-δ混合导体透氧材料的稳定性

张恒1*,王婷婷1,林维明2   

  1. (1.曲阜师范大学化学与化工学院 曲阜 273165; 2.广州大学 广州)
  • 收稿日期:2008-10-08 修回日期:2009-03-02 出版日期:2009-11-10 发布日期:2009-11-10
  • 通讯作者: 张恒，男，博士，讲师; E-mail:ttlme@126.com; 研究方向：功能陶瓷与催化材料
  • 基金资助:
    广东省自然科学基金(030514)广东省科技计划(2004B33401006)资助项目

Stability of SrFe0.6Cu0.3Ti0.1O3-δ  Mixed Conducting Membrane Material

 ZHANG Heng1*, WANG Ting-Ting1, LIN Wei-Ming2   

  1. (1.School of Chemistry and Chemical Engineering,Qufu Normal University,Qufu 273165;
    2.Guangzhou University,Guangzhou)
  • Received:2008-10-08 Revised:2009-03-02 Published:2009-11-10 Online:2009-11-10

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摘要：

利用柠檬酸络合法制备了SrFe(Cu,Ti)O3-δ混合导体透氧材料。 采用XRD、O2-TPD、H2-TPR、SEM等测试技术考察了材料的稳定性。 结果表明，SrFe0.7Cu0.3O3-δ在低氧压下会发生相分解，产生SrCuO2杂相，而掺杂Ti后的SrFe0.6Cu0.3Ti0.1O3-δ在低氧压下保持单一的钙钛矿结构。 H2-TPR和O2-TPD的测试表明，Ti4+的掺杂提高了材料的氧脱附起始温度和其它金属离子的还原温度。 SrFe0.6Cu0.3Ti0.1O3-δ膜在透氧过程中，会有Cu2+和Sr2+从钙钛矿结构中析出，在原晶粒边界形成新的小晶粒，但这种轻微的组分偏析没有影响到材料的透氧量，此透氧膜在66 h的操作过程中显示了良好的稳定性。

关键词: 透氧，混合导体，钙钛矿，相稳定性

Abstract:

SrFe(Cu,Ti)OO3-δ mixed conducting membrane materials were synthesized by citric acid complexing method. The stabilities of the materials were studied by means of XRD, O2-TPD, H2-TPR and SEM. It was found that phase decomposition occurred in SrFe0.7Cu0.3O3-δ under a low oxygen partial pressure and a minor phase SrCuO2 was formed. The addition of Ti4+ greatly enhanced the structure stability of the material, and SrFe0.6Cu0.3Ti0.1O3-δ maintained singlephased perovskite structure. H2-TPR and O2-TPD results showed that the addition of Ti4+ increased the initial oxygen desorption temperature of the material, and the reduction temperature of the other metal ions. Slight phase decomposition was found on the Heside surface of SrFe0.6Cu0.3Ti0.1O3-δ membrane after oxygen permeating test and fresh small grains congregated at the boundary of the initial grains. SrFe0.6Cu0.3Ti0.1O3-δ  exhibits a high stability during 66 h oxygen permeating process.

Key words: oxygen permeation,mixed conductor,perovskite,phase stability

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