| Instability of Structural, Magnetic, and Magnetoresistive Properties in Ordered Double-perovskite Sr_2FeMoO_6 Polycrystals |
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| 作者单位： | Jianming DAI and Yijun YANGDepartment of Physics，Huaibei Coal Industry Teachers' College，Huaibei 235000，ChinaWenhai SONG，Jiaju DU and Yuping SUNLaboratory of Internal Friction and Defect in Solids，Institute of Solid State Physics，Chinese Academy of Sciences，Hefei 230031，China |
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| 基金项目： | This work is supported by the National Key Basic Research un-der contract No，the National Natural Science Foun-dation of China under contract No，NSF ofAnhui Province under，the Fundamental Bureau of Chinese Academy of Sciences |
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| 摘 要： | The problem of instability in polycrystalline ordered double-perovskite Sr2FeMoO6, is presented in this paper. By the X-raydiffraction analysis and the measuring of electrical and magnetic transports, it is indicated that the perovskite structure of thecompound is destroyed, and the Sr2FeMoO6 phase is mainly transformed into SrMo04 phase when the samples are exposedin damp atmosphere for several weeks or immersed in water for several hours. Simultaneously, their electrical and magneticproperties obviously change, and the value of magnetoresistance remarkably reduces and even vanishes at room temperature.A possible micromechanism of the instability and an effective method to avoid the problem of instability are also discussed.
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Instability of Structural, Magnetic, and Magnetoresistive Properties in Ordered Double-perovskite Sr2FeMoO6 Polycrystals |
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| Authors: | Jianming DAI Yijun YANG Wenhai SONG Jiaju DU Yuping SUN |
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| Affiliation: | Department of Physics, Huaibei Coal Industry Teachers'College, Huaibei 235000, China... |
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| Abstract: | The problem of instability in polycrystalline ordered double-perovskite Sr2FeMoO6, is presented in this paper. By the X-raydiffraction analysis and the measuring of electrical and magnetic transports, it is indicated that the perovskite structure of thecompound is destroyed, and the Sr2FeMoO6 phase is mainly transformed into SrMo04 phase when the samples are exposedin damp atmosphere for several weeks or immersed in water for several hours. Simultaneously, their electrical and magneticproperties obviously change, and the value of magnetoresistance remarkably reduces and even vanishes at room temperature.A possible micromechanism of the instability and an effective method to avoid the problem of instability are also discussed. |
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| Keywords: | Ordered double-perovskite Instability Electrical and magnetic properties Magnetoresistance |
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