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    ZHAO Jie, WANG Zhi-qi, MA Yong-chang, MA Xu, BAO Jun-cheng, LIU Ji-wen. Preparation and Electrical Properties of LaGaO3-based Rare Earth Composite Oxides Doped with Multielement[J]. Materials and Mechanical Engineering, 2009, 33(3): 35-38.
    Citation: ZHAO Jie, WANG Zhi-qi, MA Yong-chang, MA Xu, BAO Jun-cheng, LIU Ji-wen. Preparation and Electrical Properties of LaGaO3-based Rare Earth Composite Oxides Doped with Multielement[J]. Materials and Mechanical Engineering, 2009, 33(3): 35-38.
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    Preparation and Electrical Properties of LaGaO3-based Rare Earth Composite Oxides Doped with Multielement

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    • LaGaO3-based rare earth composite oxides of La0.8Sr0.2Ga0.72Mg0.20Fe0.08O2.8(LSGMF) and La0.8Sr0.2Ga0.72Mg0.20Co0.08O2.8(LSGMC) doped with Sr,Mg and Fe or Co were synthesized by improved solid reaction method.The composition,phase structure and microstructure of LSGMF and LSGMC samples were analyzed by means of EDS,XRD and SEM.The electrical conductivities of LSGMF and LSGMC as a function of the temperature were measured by DC four-probe technique in the temperature range of 350-850 ℃.The results show that a single phase material of orthorhombic perovskite-type structure was formed after sintering in air at 1 400 ℃ in LSGMF and LSGMC.Other impurity elements were not found except for small amount of Ca in LSGMF and LSGMC samples.The relationship between temperature and the conductivity of LSGMF and LSGMC conformed to the Arrhenius equation in the temperature range of 350-500 ℃ and 500-850 ℃.The activation energies of LSGMF and LSGMC were low at 350-500 ℃(Ea<0.3 eV).The conductivities of LSGMF and LSGMC were considerably increased compared with Sr,Mg-doped LSGM.
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