摘要
采用固相反应法合成碱土金属Sr,Mg与过渡金属Fe或Co复合掺杂的LaGaO_3基氧化物LSGMC和LSGMF。通过TG/DTA研究LSGMC和LSGMF的形成过程。采用直流四端子法测量样品的电导率。利用EDS和XRD等技术分析样品的微区成分和物相结构等。结果表明LSGMC和LSGMF经1400℃烧结,获得单一正交钙钛矿结构,合成的LSGMC和LSGMF为氧离子导体;在400～850℃区间电导率与温度的关系符合Arrhenius方程;在相同温度下,Sr,Mg和Fe或Co共同复合掺杂氧化物LSGMC和LSGMF有较高的离子电导率,说明少量过渡金属Fe或Co的掺杂,有利于提高离子电导率。
Alkaline earth metal Sr, Mg and transition metal Fe or Co-doped LaGaO3based oxide LSGMF and LSGMC were prepared by solid state reaction. Forming of the complex oxides was analyzed by TG/DTA, their conductivities were measured by DC four-probes, and their composition and crystal structure were investigated by EDS and XRD. Single phase of the orthorhombic perovskite-type structure were obtained by sintering in air at 1400 ℃. The temperature dependence of the conductivity conforms for oxygen ion conductor was in aggrement with the Arrhenius equation. The complex oxide LSGMF and LSGMC exhibited a higher ionic conductivity between 600 ℃ and 850 ℃. Doping a small amount of transition metal Fe or Co could improve ion-conductivity of the oxides.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A01期40-43,共4页
Rare Metal Materials and Engineering
基金
天津市自然科学基金资助项目(33700111)
