Magnetic properties and magnetic entropy change of perovskite manganites La_(0.9-x)Eu_xSr_(0.1)MnO_3(x=0.000,0.075) by experimental method and numerical fitting

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英文篇名：Magnetic properties and magnetic entropy change of perovskite manganites La_(0.9-x)Eu_xSr_(0.1)MnO_3(x=0.000,0.075) by experimental method and numerical fitting 作者：Xiang ; Jin ; Jianjun ; Zhao ; Hongye ; Wu ; Bao ; Xu ; Yunbin ; Sun ; Xiaodong ; Sun ; Fengze ; Cao ; Kai ; Wang ; Wenxing ; Wang ; Yutong ; Zhang ; Yi ; Lu 英文作者：Xiang Jin;Jianjun Zhao;Hongye Wu;Bao Xu;Yunbin Sun;Xiaodong Sun;Fengze Cao;Kai Wang;Wenxing Wang;Yutong Zhang;Yi Lu;Key Laboratory of Magnetism and Magnetic Materials at Universities of Inner Mongolia Autonomous Region,Baotou Teachers College; 英文关键词：Perovskite;;Magnetic properties;;Magnetic entropy change;;Preforming cluster phase;;Least square method;;Rare earths 中文刊名：YXTB 英文刊名：稀土学报(英文版) 机构：Key Laboratory of Magnetism and Magnetic Materials at Universities of Inner Mongolia Autonomous Region,Baotou Teachers College; 出版日期：2019-05-20 出版单位：Journal of Rare Earths 年：2019 期：v.37 基金：Project supported by the State Key Development Program for Basic Research of China(11164019,51562032,61565013);; Inner Mongolia Natural Science Foundation(2015MS0109);; Research Program of Sciences at Universities of Inner Mongolia Autonomous Region of China(NJZZ11166,NJZY 16237,NJZY12202);; Young Science and Technology Foundation of Baotou Teachers'College(BSYKJ2014-22) 语种：英文; 页：YXTB201906010 页数：6 CN：06 ISSN：11-2788/TF 分类号：66-71

摘要

Polycrystalline samples La_(0.9-x)EuxSr_(0.1)MnO_3(x = 0.000, 0.075) were prepared by the standard solid-state reaction method. The results show that the samples preform a characteristic of clusters spin-glass state at low temperature. The samples show a characteristic of ferromagnetism(FM) characteristic in the temperature range of 15-125 K and 15-150 K respectively; the samples show preformed clusters in the temperature range of 125-343 K and 150-325 K, respectively, the samples show paramagnetism(PM)characteristic above 343 and 325 K, respectively. The second-order transitions are found at 118 and 135 K for undoped and doped sample, respectively. When the applied magnetic field is 7 T, the maximum magnetic entropy change |△S_M| value of the samples is near the Curie temperature(Tc), and the value of|△S_M| reaches 2.76 and 3.03 J/(K kg), respectively. In addition, the relative cooling power(RCP) is found to be 425.28 and 443.53 J/kg. The numerical fitting data fit well with experimental data. These results indicate that both the samples have the potential to realize magnetic refrigeration in the high temperature region(T > 77 K).
        Polycrystalline samples La_(0.9-x)EuxSr_(0.1)MnO_3(x = 0.000, 0.075) were prepared by the standard solid-state reaction method. The results show that the samples preform a characteristic of clusters spin-glass state at low temperature. The samples show a characteristic of ferromagnetism(FM) characteristic in the temperature range of 15-125 K and 15-150 K respectively; the samples show preformed clusters in the temperature range of 125-343 K and 150-325 K, respectively, the samples show paramagnetism(PM)characteristic above 343 and 325 K, respectively. The second-order transitions are found at 118 and 135 K for undoped and doped sample, respectively. When the applied magnetic field is 7 T, the maximum magnetic entropy change |△S_M| value of the samples is near the Curie temperature(Tc), and the value of|△S_M| reaches 2.76 and 3.03 J/(K kg), respectively. In addition, the relative cooling power(RCP) is found to be 425.28 and 443.53 J/kg. The numerical fitting data fit well with experimental data. These results indicate that both the samples have the potential to realize magnetic refrigeration in the high temperature region(T > 77 K).

引文

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