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  • 曹凤泽,陈红伟,藏宝,刘娇,田野,周敏,鲁毅,赵建军,金香.钙钛矿锰氧化物La0.8-xEuxSr0.2MnO3(x=0,0.05)的磁性和磁熵变研究[J].低温物理学报,2019,(1):42-48.    [点击复制]
  • CAO Fengze,CHEN Hongwei,ZANG Bao,Liu Jiao,Tian Ye,ZHOU Min,CAO Fengze,ZHAO Jianjun,JIN Xiang.Magnetic and Magnetic Entropy Changes of Perovskite Manganese Oxide La0.8-xEuxSr0.2MnO3 (x = 0,0.05)[J].LOW TEMPERATURE PHYSICAL LETTERS,2019,(1):42-48.   [点击复制]
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钙钛矿锰氧化物La0.8-xEuxSr0.2MnO3(x=0,0.05)的磁性和磁熵变研究
曹凤泽1, 陈红伟1, 藏宝1, 刘娇1, 田野1, 周敏1,2, 鲁毅1,2, 赵建军1,2, 金香1,2
0
(1.包头师范学院物理科学与技术学院,内蒙古包头 014030;2.内蒙古自治区磁学与磁性材料重点实验室,包头师范学院,内蒙古包头 014030)
摘要:
本篇文章主要研究钙钛矿氧化物La0.8-xEuxSr0.2MnO3(x=0,0.05)中A位掺杂铕(Eu)后对样品的磁性和磁熵变的影响。采用传统的固相反应法制备多晶样品,根据数据拟合得到XRD图像和晶格参数,通过对两样品的M-T曲线和M-H曲线研究发现:x=0和x=0.05两样品在高温区均表现出顺磁性,居里温度Tc分别为283 K(x=0)和284 K(x=0.05),且在居里温度附近表现出铁磁性。随着掺杂量增加,样品的居里外斯温度降低(θ_(x=0)=322 K、θ_(x=0.05)=304 K),表明〖Eu〗^(3+)掺杂改变了系统内的铁磁耦合。在7 T磁场下磁熵变的最大值分别为2.73 J/kg·K和4.19 J/kg·K,表明〖Eu〗^(3+)掺杂使得最大磁熵变值增大。对比制冷效率,发现该系列样品具有作为磁制冷材料的潜质。
关键词:  钙钛矿,磁性,磁熵变
DOI:
基金项目:
Magnetic and Magnetic Entropy Changes of Perovskite Manganese Oxide La0.8-xEuxSr0.2MnO3 (x = 0,0.05)
CAO Fengze1, CHEN Hongwei1, ZANG Bao1, Liu Jiao1, Tian Ye1, ZHOU Min1,2, CAO Fengze1,2, ZHAO Jianjun1,2, JIN Xiang1,2
(1.Baotou teachers college physics institute of science and technology, Baotou, Inner Mongolia, 014030;2.Key laboratory for magnetism and magnetic material of Inner Mongolia autonomous region, Baotou teachers college, Inner Mongolia Baotou, 014030)
Abstract:
In this thesis, we mainly study the effect of A site doping Eu on the magnetic and magnetic entropy change of La0.8-xEuxSr0.2MnO3(x=0,0.05). The polycrystalline samples were prepared by the traditional solid-state reaction method. According to the analysis of XRD data, there was no obvious impurity peak after the Eu incorporation, and the imaging was good. The results of M-T and M-H curves of two samples show that the two samples show paramagnetismabove 374 K, the Curie temperature Tc is 283 K (x =0) and 284 K (x=0.05), and shows ferromagnetism near the Curie temperature and weak antiferromagnetism at the low temperature. As the doping amount increases, the Curie temperature decreases (θ (x = 0) = 322 K, θ (x = 0.05) = 304 K), indicating that the doping of Eu3+ Ferromagnetic coupling. The maximum values of magnetic entropy change at 7 T magnetic field are 2.73J / kg · K and 4.19 J / kg · K, respectively, indicating that the maximum magnetic entropy change increases with the doping of Eu3+. Comparing the refrigeration efficiency, we found that this series of samples has potential as a magnetic refrigeration material.
Key words:  Perovskite, Magnetic, Magnetic Entropy Changes

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