中文摘要：

采用固相合成法制备了La0.8Sr0.2（Ga0.8Mg0.2）1-xFexO3-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氏0和CO：加热脱附所致,表观活化能为0.154-0.227eV,中温区域和髙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E2＋3最大,说明失重速率最慢,材料稳定性最髙.

英文摘要：

The mixed conductor La0.8Sr0.2（Ga0.8Mg0.2）1-xFexO3-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 H20 and C〇 2 adsorbed on the surface of LSGMF,and the apparent activation energy is 0. 154 ？0. 227 eV. 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？ 350 eV. When the doped Fe content x is 0. 9 ,the peak value of weight loss rate is the smallest （0. 013 7/s ） ,and the apparent activation energy E2＋3 is the highest. It indicates that the weight loss rate is the slowest and the stability of LSGMF is the highest.