| Substituting Effect of Y in La0.5Ba0.5 CoO3 |
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| 作者姓名： | 刘宜华 张汝贞 王成建 岳龙强 季刚 梅良模 |
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| 作者单位： | SchoolofPhysics,ShandongUniversity,Jinan250100,China |
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| 基金项目： | ProjectsupportedbytheStateKeyProjectofFundamentalResearch (G19980 613 0 10 )，theNationalScientificandTechno logicalDepartmentofChina |
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| 摘 要： | La0.5-xYxBa0.5CoO3 polycrystals were prepared by solid state reaction. The substituting effects of Y for La on the magnetic and transport properties of the materials were studied systematically. The results indicate that substitution of Y induces two effects. Firstly, the charge transfer from Y to 3d orbital of Co happens. This causes the molecular magnetic moment to decrease. Secondly, the antiferromagnetic exchange interaction of Co ions appears. When the content of Y is less than or equal to 30%, the non-colinear structure of spins in materials is observed. When the content of Y is greater than 30%, the materials transit from predominant ferromagnetic state to predominant antiferromagnetic one. The conductive mechanism for the materials with different content of Y belongs to the variable range hopping conduction of polarons.The resistivity of materials increases sharply with increasing Y content.
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| 关 键 词： | LaBaCoO3 稀土 电荷转移 尖硬纤维结构 钇 磁性材料 |
Substituting Effect of Y in La0.5Ba0.5CoO3 |
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| Liu Yihua ,Zhang Ruzhen,Wang Chengjian,Yue Longqiang,Ji Gang,Mei Liangmo.Substituting Effect of Y in La0.5Ba0.5 CoO3[J].Journal of Rare Earths,2003,21(3):347-350. |
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| Authors: | Liu Yihua Zhang Ruzhen Wang Chengjian Yue Longqiang Ji Gang Mei Liangmo |
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| Affiliation: | Liu Yihua *,Zhang Ruzhen,Wang Chengjian,Yue Longqiang,Ji Gang,Mei Liangmo |
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| Abstract: | La 0.5- x Y x Ba 0.5 CoO 3 polycrystals were prepared by solid state reaction. The substituting effects of Y for La on the magnetic and transport properties of the materials were studied systematically. The results indicate that substitution of Y induces two effects. Firstly, the charge transfer from Y to 3d orbital of Co happens. This causes the molecular magnetic moment to decrease. Secondly, the antiferromagnetic exchange interaction of Co ions appears. When the content of Y is less than or equal to 30%, the non colinear structure of spins in materials is observed. When the content of Y is greater than 30%, the materials transit from predominant ferromagnetic state to predominant antiferromagnetic one. The conductive mechanism for the materials with different content of Y belongs to the variable range hopping conduction of polarons. The resistivity of materials increases sharply with increasing Y content. |
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| Keywords: | La 0 5- x Y x Ba 0 5 CoO 3 compound charge transfer non colinear structure of spins variable range hopping conduction rare earths |
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