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SmCoO3的固相合成及性质

刘润茹1,2,许大鹏1,李霜1,吕喆3,薛燕峰1,王德涌1,苏文辉1,3,4   

  1. (1.吉林大学物理学院,长春130021;2.长春大学应用理学院,长春130022;3.哈尔滨工业大学凝聚态科学与技术研究中心,哈尔滨150001;4.中国科学院国家材料与技术研究中心,沈阳110015)
  • 收稿日期:2004-12-30 修回日期:1900-01-01 出版日期:2005-09-26 发布日期:2005-09-26
  • 通讯作者: 许大鹏

Solid-state Synthesis and Properties of SmCoO3

LIU Run-ru1,2,XU Da-peng1,LI Shuang1,Lü Zhe3,XUE Yan-feng1,WANG De-yong1,SU Wen-hui1,3,4   

  1. (1.College of Physics,Jilin University,Changchun130021,China;2.Applied Physics Insititute, Changchun University,Changchun130022,China;3.Center for the Condensed-matter Science and Technology,Harbin Institute of Technology,Harbin150001,China;4.International Center for Materials Physics,Academic Sinica,Shenyang110015,China)
  • Received:2004-12-30 Revised:1900-01-01 Online:2005-09-26 Published:2005-09-26
  • Contact: XU Da-peng

摘要: 以Sm2O3和Co2O3为原料,使用高温固相反应法合成SmCoO3正交钙钛矿化合物,采用X射线衍射、Raman谱、热膨胀仪和高温电导等测试技术对样品进行了结构和性能研究.结构分析表明,Sm2O3与Co2O3在1353K附近可以进行固态反应,形成单相性很好的SmCoO3正交钙钛矿相.高温电导测量显示单相SmCoO3随温度升高由绝缘体向半导体转变,Arrhenius图表明绝缘体—半导体转变点在470K附近.单相SmCoO3的热膨胀系数在873K以上为2.17×10-5K-1,和掺杂LaGaO3相近,但明显大于SDC(Ce0.85Sm0.15O2)的热膨胀系数.

关键词: SmCoO3, 固相反应, 阴极材料, 结构表征, 电导率

Abstract: The solid-state reaction method was used to prepare the perovskite oxide SmCoO3.The structure and properties of the samples have been investigated by XRD,Raman spectral techniques and DC measurements and so on.The XRD and Raman spectra show that the mixtures of Co2O3 and Sm2O3 can form a single-phase perovskite oxide SmCoO3 by solid-state reaction around 1353K.The clearly observed band in the room temperature Raman spectra of single-phase SmCoO3 is at 140~175cm-1,,which is assigned to the stretching of Sm—O and the winding of O—Sm—O.The single-phase SmCoO3is an insulator below 600K,and the conductivity is enhanced obviously with temperature increasing above 600K.This may be explained by the fact that an insulator to semiconductor transition occurs around 470K.The thermal expansion coefficient(2.17×10-5,K-1,)of the single-phase SmCoO3is approximately equal to that of doped LaGaO3,but bigger than that of SDC(Ce0.85Sm0.15O2)above 873K.

Key words: SmCoO3, solid-state reaction, cathode material, structure characteristic, conductivity

中图分类号: 

  • O643.4