| 稀土空位庞磁电阻材料La(1-x)2/3Ca1/3MnO3的结构变化和输运性质 |
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| 引用本文： | 李小怡,罗广圣,吴小山. 稀土空位庞磁电阻材料La(1-x)2/3Ca1/3MnO3的结构变化和输运性质[J]. 中国稀土学报, 2006, 24(2): 201-204 |
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| 作者姓名： | 李小怡 罗广圣 吴小山 |
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| 作者单位： | 1. 南昌大学材料科学与工程学院,江西,南昌,330047;南京大学固体微结构国家重点实验室,江苏,南京,210093
2. 南昌大学材料科学与工程学院,江西,南昌,330047 |
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| 基金项目： | 中国科学院资助项目;广东省博士启动基金 |
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| 摘 要： | 利用标准的固相反应法制备了La（1-x）2/3Ca（1/3）MnO3（x〈0.1）系列具有稀土La空位的庞磁电阻锰氧化物多晶样品.X射线粉末衍射（XRD）测量分析表明所有的样品均为单相,单胞具有正交对称性（Pnma）.分析了不同浓度的La空位对磁电输运性质的影响： 随着空位浓度的增大,绝缘体-金属的转变温度（TMI）几乎不变（约为267 K）,这表明少量的稀土空位不会破坏双交换作用;但当La空位浓度x〉0.04时,零场电阻率增大,但磁电阻（MR）值减小;在x=0.04时MR值在转变温度TMI处达到最大值约为220%（8 T）.
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| 关 键 词： | La空位 结构 磁电阻 稀土 |
| 文章编号： | 1000-4343（2006）02-0201-04 |
| 收稿时间： | 2005-08-24 |
| 修稿时间： | 2005-08-242005-10-18 |
Structure and Transport Properties in CMR Materials of La(1-x)2/3Ca1/3MnO3 with Rare Earth Vacancies |
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| Li Xiaoyi,Luo Guangsheng,Wu Xiaoshan. Structure and Transport Properties in CMR Materials of La(1-x)2/3Ca1/3MnO3 with Rare Earth Vacancies[J]. Journal of the Chinese Society of Rare Earths, 2006, 24(2): 201-204 |
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| Authors: | Li Xiaoyi Luo Guangsheng Wu Xiaoshan |
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| Affiliation: | 1. School of Material Science and Engineering,Nanchang University, Nanchang 330047, China; 2. Lab of Solid Microstructures, Nanjing University, Nanjing 210093, China |
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| Abstract: | Samples of manganese oxides La_ (1-x)2/3Ca_ 1/3MnO_3 (x<0.10) with La-vacancy were prepared by standard solid-state reaction method. All the samples are single phase, with orthorhombic symmetry(Pnma), analyzed by XRD and with Rietveld Refinement. The effect of different La-site vacancies concentration on electronic transport of La_ 2/3Ca_ 1/3MnO_3 was investigated. The insulator-metal transition temperature(about 267 K) nearly remains unchanged with the increase of vacancy concentration, which indicates that small La-vacancy does not destroy the double exchange interaction. But the electronic resistance increases and MR value decreases with La-vacancy content x>0.04. The maximum of the MR value (8 T) is about 220% at transition temperature(T_ MI). |
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| Keywords: | La(1-x)2/3Ca1/3MnO3 |
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