| La—Na—Mn—O纳米颗粒的磁卡效应 |
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| 引用本文： | 陈伟,钟伟.La—Na—Mn—O纳米颗粒的磁卡效应[J].材料研究学报,1999,13(5):552-554. |
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| 作者姓名： | 陈伟 钟伟 |
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| 作者单位： | 南京大学固体微结构国家重点实验室!河北师范大学(陈伟)，南京大学固体微结构国家重点实验室(钟伟，都有为)，河北师范大学(侯登录，朱明刚，潘成福) |
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| 摘 要： | 用溶胶－凝胶法制备了Ｌａ１－ｘＮａｘＭｎＯｚ多晶纳米颗粒。用结构分析，程序升温还原及磁性测量等方法研究限样品的结构和磁卡效应。结果表明，样品的居里温度ＴＣｎ－Ｏ键长有密切的联系，这些材料在低磁场下在室温附近较大的温度范围内具有相当大的磁熵变，是较为理想的室温磁致冷工作物质。
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| 关 键 词： | 锰钙钛矿 巨磁阻效应 磁卡效应 磁熵变 纳米颗粒 |
MAGNETOCALORIC EFFECT OF THE PEROVSKITE TYPE La Na Mn O |
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| CHEN Wei , ZHONG Wei HOU Denglu ZHU Minggang PAN Chengfu DU Youwei.MAGNETOCALORIC EFFECT OF THE PEROVSKITE TYPE La Na Mn O[J].Chinese Journal of Materials Research,1999,13(5):552-554. |
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| Authors: | CHEN Wei ZHONG Wei HOU Denglu ZHU Minggang PAN Chengfu DU Youwei |
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| Affiliation: | CHEN Wei 1,2** ZHONG Wei 1 HOU Denglu 2 ZHU Minggang 2 PAN Chengfu 2 DU Youwei 1 |
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| Abstract: | The perovskite type manganese oxides La 1- x Na x MnO z were prepared using sol gel method. The structure and magnetocaloric effect of the samples were studied by structure analysis, temperature programmed reduction (TPR) and magnetic measurement. A close relationship between T c and the bond distance of Mn O is observed. Results of magnetic measurement showed that these materials have quite large magnetic entropy changes in a low magnetic field and can be utilized as suitable candidates for magnetic refrigerants in a wide temperature rang. |
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| Keywords: | perovskite type manganese oxides colossal magnetoresistance effect magnetocaloric effect magnetic entropy changes |
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