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《Rare Metal Materials and Engineering》 2004-02
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Structure and Electrical Properties of La_0.6 Sr_0.4 Co_1-y Fe_yO_3 Perovskite-Type Oxides

Xu Qing, Huang Duanping, Chen Wen, Wang Hao, Yuan Runzhang ( Sate Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan 430070, China) ( School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China)  
La0.6Sr0.4CO1-yFeyO3 system oxides were synthesized by using a solid reaction method, and the perovskite-type structure with rhombohedral symmetry was certified by XRD for the oxides with different Co/Fe ratios. The results show that the electrical conductivity of La0.6Sr0.4CoO3 (y=0) decreases monotonously with increasing temperature in the range from room temperature to 900℃, while the electrical conductivities of the samples with other compositions increase with temperature and then decrease after a maximum. The temperature corresponding to the electrical conductivity maximum shifts from 250 ℃ for La0.6Sr0.4Co0.8Fe0.2O3 (y=0.2) to 650 ℃ for La0.6Sr0.4FeO3 (y=1.0) with increasing Co/Fe ratio. It was confirmed that the hopping of small polarons is the dominating mechanism for the electrical conduction at low temperature. The activation energy of the small polarons increases from 0.033 ev with the increase of Co/Fe ratio.
【Fund】: 湖北省自然科学基金(2001ABB075);; 武汉市晨光计划资助项目(20015005031);; 材料复合新技术国家重点实验室重点基金
【CateGory Index】: TB32
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