东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (9): 1257-1262.DOI: 10.12068/j.issn.1005-3026.2017.09.010

• 材料与冶金 • 上一篇    下一篇

La0.8Sr0.2(Ga0.8Mg0.2)1-○xFexO3-○δ混合导体的热分析及动力学

张小芳， 刘涛， 于景坤， 高翔   

  1. (东北大学 冶金学院， 辽宁 沈阳110819)
  • 收稿日期:2016-04-19 修回日期:2016-04-19 出版日期:2017-09-15 发布日期:2017-09-08
  • 通讯作者: 张小芳
  • 作者简介:张小芳(1983－)， 女， 辽宁庄河人， 东北大学博士研究生; 于景坤(1960－)， 男， 辽宁康平人， 东北大学教授， 博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51374055).

Thermal Analysis and Kinetics of La0.8Sr0.2(Ga0.8Mg0.2)1-○xFe○xO3-○δ○ Mixed Conductor

ZHANG Xiao-fang， LIU Tao， YU Jing-kun， GAO Xiang   

  1. School of Metallurgy， Northeastern University， Shenyang 110819， China.
  • Received:2016-04-19 Revised:2016-04-19 Online:2017-09-15 Published:2017-09-08
  • Contact: LIU Tao
  • About author:-
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摘要： 采用固相合成法制备了La0.8Sr0.2(Ga0.8Mg0.2)1-○xFe○xO3-○δ(LSGMF)混合导体，利用SEM和TGA对LSGMF的性能进行了研究，考察了不同Fe掺杂量对LSGMF的热失重过程及其动力学的影响规律，并采用Coats-Redfem法求解其失重过程的表观活化能.结果表明:LSGMF热失重过程包括三个阶段，低温区域的热失重主要是由于试样表面吸附的H2O和CO2加热脱附所致，表观活化能为0.154~0.227eV，中温区域和高温区域的热失重主要归因于晶格位置上的氧离子转变为氧分子并进入气相，表观活化能为0.280~0.350eV.x=0.9时，LSGMF的失重速率峰值最小(0.0137/s)，表观活化能E○2+3最大，说明失重速率最慢，材料稳定性最高.

关键词: 混合导体, LSGMF, 热分析, 动力学, Coats-Redfem

Abstract: The mixed conductor La0.8Sr0.2(Ga0.8Mg0.2)1-○xFe○xO3-○δ (LSGMF) samples were prepared by solid-state reaction. The performances were researched by scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The influence of doped Fe content on the thermal weight loss process and kinetics of LSGMF was investigated， and the apparent activation energy for the process was calculated with the Coats-Redfem method. The results showed that the thermal weight loss process of LSGMF can be divided into three stages. In the low-temperature region， the thermal weight loss is mainly caused by desorption of H2O and CO2 adsorbed on the surface of LSGMF， and the apparent activation energy is 0.154~0.227eV. In the medium and high temperature region， it mainly attributes to some of the lattice oxygen atoms becoming O2， and the apparent activation energy is 0.280~0.350eV. When the doped Fe content x is 0.9， the peak value of weight loss rate is the smallest (0.0137/s)， and the apparent activation energy E○2+3 is the highest. It indicates that the weight loss rate is the slowest and the stability of LSGMF is the highest.

Key words: mixed conductor, LSGMF, thermal analysis, kinetics, Coats-Redfem

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