| 晶粒尺寸对Bi0.2Ca0.8MnO3电荷有序的影响 |
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| 引用本文： | 李晓娟,王强. 晶粒尺寸对Bi0.2Ca0.8MnO3电荷有序的影响[J]. 物理学报, 2009, 58(9): 6482-6486 |
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| 作者姓名： | 李晓娟 王强 |
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| 作者单位： | (1)陕西教育学院数理工程系，西安 710061; (2)西安工业大学材料与化工学院，西安 710032 |
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| 摘 要： | 利用溶胶-凝胶法制备了平均晶粒尺寸在38—1500 nm的系列Bi0.2Ca0.8MnO3多晶样品，研究了它们的结构、电输运性质和磁性.研究结果表明，随着晶粒尺寸的减小，电荷有序逐渐消失、最后被完全压制，导致低温下出现自旋玻璃态.利用马氏体相变图像和表面效应解释了相关现象.关键词：钙钛矿锰氧化物电荷有序马氏体相变自旋玻璃
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| 关 键 词： | 钙钛矿锰氧化物 电荷有序 马氏体相变 自旋玻璃 |
| 收稿时间： | 2008-11-23 |
| 修稿时间： | 2009-03-09 |
Grain size effect of charge ordering of Bi0.2Ca0.8MnO3 |
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| Li Xiao-Juan,Wang Qiang. Grain size effect of charge ordering of Bi0.2Ca0.8MnO3[J]. Acta Physica Sinica, 2009, 58(9): 6482-6486 |
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| Authors: | Li Xiao-Juan Wang Qiang |
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| Abstract: | A series of Bi0.2Ca0.8MnO3 samples with average grain size ranging from 38 to 1500 nm have been prepared by the sol-gel method and their structure，electrical transport，and magnetic properties were investigated. It is found that with the reduction of the grain size，the charge ordered phase gradually diminishes till it is completely suppressed，leading to appearance of the spin-glass state at low temperature. These behaviors are discussed in terms of the martensitic transformation and surface effect. |
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| Keywords: | perovskite manganites charge ordering martensitic transformation spin glass |
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