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无机材料学报

无机材料学报

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La0.9Sr0.1Ga0.8Mg0.2O3-α的柠檬酸盐法制备和表征

郑文君1; 武丽艳1; 彭定坤; 孟广耀2   

  1. 1. 南开大学化学系, 天津 300071; 2. 中国科学技术大学材料科学与工程系, 合肥 230026
  • 收稿日期:2000-03-30 修回日期:2000-05-08 出版日期:2001-03-20 网络出版日期:2001-03-20

Preparation and Characterization of La0.9Sr0.1Ga0.8Mg0.2O3-α by Citrate Method

ZHENG Wen-Jun1; WU Li-Yan1; PENG Ding-Kun2; MENG Guang-Yao2   

  1. 1. Department of Chemistry; Nankai University; Tianjin 300071; China; 2. Department of Materials Science and Engineering; University of Science and Technology of China; Hefei 230026; China
  • Received:2000-03-30 Revised:2000-05-08 Published:2001-03-20 Online:2001-03-20

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摘要： 采用柠檬酸盐法制备了　Ｌａ０．９Ｓｒ０．１Ｇａ０．８Ｍｇ０．２Ｏ３－α（ＬＳＧＭ）粉体材料．ＴＧ和　ＤＴＡ分析表明，凝胶在２６５～３０９℃下分解为相应的氧化物．ＸＲＤ测试表明，凝胶在１３００℃以上煅烧时，转变为简单立方钙钛矿结构的纯相产物．１４５０℃下烧结体的相对密度为８８％，其复阻抗特性表明产物中没有明显的晶界过程，且在８００℃下的电导率为 ２.１×１０－２Ｓｃｍ－１，活化能为０．９８ｅＶ．

关键词: 柠檬酸盐法, 氧离子导体, LSGM

Abstract: La0.9Sr0.1Ga0.8Mg0.2O3-α was prepared by a citrate method. Thermal analysis (TG/DTA) was used to characterize the thermal decomposition of the organic ligands of the gel. The gel decomposed to its oxides at 256-309℃. X-ray diffraction patterns indicate a pure primitive-cubic phase is formed by 1300℃ without impure phases. The impedance spectra of an 88%-dense sample exhibit no grain-boundary contribution, a conductivity σ=2.l×10-2Scm-1 at 800℃ and an activity energy E=0.98eV.

Key words: citrate method, oxide-ion conductor, LSGM

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