| La0.5Ba0.5CoO3中Y的替代效应 |
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| 引用本文： | 刘宜华,张汝贞,王成建,岳龙强,季刚,梅良模.La0.5Ba0.5CoO3中Y的替代效应[J].中国稀土学报,2002,20(3):244-247. |
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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： | 山东大学物理学院,山东,济南,250100 |
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| 基金项目： | 国家重点基础研究专项经费 (G19980 613 0 10 )，国家科技部资助项目 |
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| 摘 要： | 用固相反应法制备了La0.5Ba0.5CoO3多晶材料，系统研究了Y的替代对材料磁性和输运特性的影响，结果发现，Y的掺入主要产生了两种效应，一是Y向Co的3d轨道产生了电荷转移，使分子磁矩下降，二是出现了Co离子的反铁磁交换作用，当Y含量少于或等于0.3时，材料中出现了自旋的非共线结构。当Y含量大于0.3时，材料从铁磁态为主转变为反铁磁态为主，对不同Y含量的材料，其导电机制都属于极化子的变程跳跃导电，随Y含量增加，材料电经迅速增大。
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| 关 键 词： | La0.5Ba0.5CoO3 替代效应 稀土 电荷转移 自旋非共线结构 变程跳跃导电 钴酸钡镧 半导体 钇 |
| 文章编号： | 1000-4343(2002)03-0244-04 |
| 修稿时间： | 2001年6月25日 |
Substituting Effect of Yttrium in La0.5Ba0.5CoO3 |
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| Liu Yihua,Zhang Ruzhen,Wang Chengjian,Yue Longqiang,Ji Gang,Mei Liangmo.Substituting Effect of Yttrium in La0.5Ba0.5CoO3[J].Journal of the Chinese Rare Earth Society,2002,20(3):244-247. |
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| Authors: | Liu Yihua Zhang Ruzhen Wang Chengjian Yue Longqiang Ji Gang Mei Liangmo |
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| Institution: | Liu Yihua~*,Zhang Ruzhen,Wang Chengjian,Yue Longqiang,Ji Gang,Mei Liangmo |
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| Abstract: | La 0.5- x Y xBa 0.5 CoO 3 polycrystals were prepared by the solid state reaction. 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 or equal to 0.3, the non co linear structure of spins in materials is observed. When the content of Y is greater than 0.3, the materials transit from mainly ferromagnetic state to mainly 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: | rare earths La 0 5- x Y x Ba 0 5 CoO 3 compound charge transfer non co linear structure of spins variable range hopping conduction |
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