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  • 廖杨芳,詹建友,宋春红,杨姗姗,吕兵.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]
  • LIAOYangfang,ZHANJianyou,SONGChunhong,YANGShanshan,LVBing.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
廖杨芳, 詹建友, 宋春红, 杨姗姗, 吕兵
0
(贵州师范大学 物理与电子科学学院, 贵阳 550001)
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:10.13380/j.ltpl.02019.03.007
基金项目:
Magnetic and Magnetic Entropy Changes of Perovskite Manganese Oxide La0.8-xEuxSr0.2MnO3 (x = 0,0.05)
LIAOYangfang, ZHANJianyou, SONGChunhong, YANGShanshan, LVBing
(College of Physics and Electronic Sciences,Guizhou Normal University,Guiyang 550001)
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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