| La_(1-x)K_xMnO_3磁卡效应的研究 |
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| 引用本文： | 陈伟,钟伟,侯登录,都有为. La_(1-x)K_xMnO_3磁卡效应的研究[J]. 河北科技大学学报, 1998, 0(3) |
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| 作者姓名： | 陈伟 钟伟 侯登录 都有为 |
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| 作者单位： | 南京大学固体微结构国家重点实验室，河北师范大学物理系 |
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| 摘 要： | 用溶胶法制备了Ｌａ１－ｘＭｎＯ３系列样品，经ＸＲＤ分析表明样品为单相钙钛矿结构。ＴＥＭ结果显示样品的颗粒基本呈球状，粒径约在２００～３００ｎｍ之间。利用振动样品磁强计（ＶＳＭ）测量了样品的Ｍ－Ｔ和Ｍ－Ｈ曲线，研究了样品的居里温度和最大磁熵变随掺杂量的变化规律。结果表明，当调节居里温度在室温附近时，样品在低磁场下仍具有较大的磁熵变，有望成为在室温下使用的磁制冷工质。
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| 关 键 词： | 磁性材料；居里温度；磁卡效应；磁熵变 |
Research on Magnetocaloric Effect of La 1-x K x MnO 3 |
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| Chen Wei , Zhong Wei Hou Denglu Du Youwei .National Laboratory of Solid state Microstuctures,Nanjing University,Nanjing. Research on Magnetocaloric Effect of La 1-x K x MnO 3[J]. Journal of Hebei University of Science and Technology, 1998, 0(3) |
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| Authors: | Chen Wei Zhong Wei Hou Denglu Du Youwei .National Laboratory of Solid state Microstuctures Nanjing University Nanjing |
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| Affiliation: | Chen Wei 1,2 Zhong Wei 1 Hou Denglu 2 Du Youwei 1 1.National Laboratory of Solid state Microstuctures,Nanjing University,Nanjing,210093 2.Department of Physics,Hebei Teachers' University,Shijiazhuang,050061 |
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| Abstract: | Polycrystalline samples of La 1-x K xMnO 3 are prepared by the sol gel method.XRD results show that the samples are single phase of perovskite type oxide.The Curie temperatures and the magnetic entropy changes of the samples are studied by VSM.The quite large magnetic entropy changes upon the application of a low magnetic field suggest that these materials can be used as candidates for magnetic refrigerant with wide applied temperature span. |
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| Keywords: | magnetic materials Curie temperature magnetocaloric effect magnetic entropy change |
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