过渡和碱土金属掺杂对LaGaO3固体电解质电性能影响

Influence of alkaline earth and transition metal-doping on electrical properties of LaGaO3 solid electrolyte

    摘要
  • 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LaGaO3基氧化物LS-GMC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在400℃-850℃温度区间的电导率;利用EDS和XRD等技术分析样品的微区成分和晶体结构等。结果表明,约在1000℃开始形成钙钛矿相,经1400℃烧结,获得单一正交钙钛矿结构;在测试温度范围,电导率与温度的关系符合Arrhenius方程,合成的LSGMC和LSGMF为氧离子导体;在相同温度下,Sr、Mg和Fe或Co复合掺杂氧化物LSGMC和LSGMF与仅Sr、Mg双掺杂氧化物LSGM相比具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。

     

    Abstract: Alkaline earth metal Sr,Mg and transition metal Fe or Co-doped LaGaO3 based oxide LSGMF and LSGMC were prepared by solid state reaction.The Forming process of complex oxide sample was analyzed via TG/DTA.The conductivity of sample has been measured by DC four-probe technique in 600℃-850℃.The composition and crystal structure were investigated by using EDS and XRD.The Experimental results show that the formation of perovskite phase begins at about 1000℃,single phase material of the orthorhombic perovskite-type structure are obtained after sintering in air at 1400℃.Oxygen ion conductor according to the fact that temperature dependence of the conductivity conforms to the Arrhenius equation.Complex oxide LSGMF and LSGMC exhibits higher ionic conductivity than LSGM doped with Sr and Mg under same temperature.Doping with small amount of transition metal Fe or Co is effective for improving the oxide ion conductivity.

     

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