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    赵捷, 王志奇, 马永昌, 马叙, 包俊成, 刘技文. 多元掺杂LaGaO3基稀土复合氧化物的制备与导电性能[J]. 机械工程材料, 2009, 33(3): 35-38.
    引用本文: 赵捷, 王志奇, 马永昌, 马叙, 包俊成, 刘技文. 多元掺杂LaGaO3基稀土复合氧化物的制备与导电性能[J]. 机械工程材料, 2009, 33(3): 35-38.
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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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    多元掺杂LaGaO3基稀土复合氧化物的制备与导电性能

    Preparation and Electrical Properties of LaGaO3-based Rare Earth Composite Oxides Doped with Multielement

      摘要
    • 摘要: 采用改进的固相反应法合成了锶、镁与铁或钴多元掺杂的LaGaO3基稀土复合氧化物La0.8Sr0.2Ga0.72Mg0.20Fe0.08O2.8(LSGMF)和La0.8Sr0.2Ga0.72Mg0.20Co0.08O2.8(LSGMC),利用EDS、XRD及SEM等方法对LSGMF和LSGMC的化学成分、物相组成及显微组织等进行了分析;采用直流四端子法测量了两者在350～850 ℃温度区间的电导率.结果表明:经1 400 ℃烧结后,LSGMF和LSGMC均形成单一正交钙钛矿结构;两者除含少量钙外,不含其他杂质元素;在测试温度范围,材料的电导率与温度的关系分区间符合Arrhenius方程,在较低温阶段(350～500 ℃)具有较低的导电活化能(Ea<0.3 eV);与仅用锶、镁双掺杂的LSGM相比,LSGMF和LSGMC具有较高的电导率.

       

      Abstract: 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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