Magnetic properties and magnetic entropy change of perovskite manganites La0.9-xEuxSr0.1MnO3（x=0.000,0.075） by experimental method and numerical fitting
来源期刊：JOURNAL OF RARE EARTHS2019年第6期
论文作者：Xiang Jin Jianjun Zhao Hongye Wu Bao Xu Yunbin Sun Xiaodong Sun Fengze Cao Kai Wang Wenxing Wang Yutong Zhang Yi Lu
文章页码：622 - 627
摘 要：Polycrystalline samples La0.9-xEuxSr0.1MnO3（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 |△SM| value of the samples is near the Curie temperature（Tc）, and the value of|△SM| 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）.
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
摘 要：Polycrystalline samples La0.9-xEuxSr0.1MnO3（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 |△SM| value of the samples is near the Curie temperature（Tc）, and the value of|△SM| 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）.
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