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首页> 外文期刊>RSC Advances >Structural, magnetic and theoretical investigations on the magnetocaloric properties of La0.7Sr0.25K0.05MnO3 perovskite
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Structural, magnetic and theoretical investigations on the magnetocaloric properties of La0.7Sr0.25K0.05MnO3 perovskite

机译：La0.7Sr0.25K0.05MnO3钙钛矿磁热性质的结构，磁性和理论研究

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摘要

The La0.7Sr0.25K0.05MnO3 (LSKMO0.05) manganite compound was synthesized by the solid state reaction method. X-ray diffraction analysis revealed that this sample crystallizes in the distorted rhombohedral system with the R (3) over barc space group. The magnetic study showed a second order paramagnetic (PM)-ferromagnetic (FM) transition at the Curie temperature T-C = 332 K. In addition, isothermal measurements of magnetization allowed us, through thermodynamic Maxwell relations, to determine the magnetic entropy change (Delta S-M). The maximum magnetic entropy change (Delta S-max) and the relative cooling power (RCP) were found to be, respectively, 2.37 J kg(-1) K-1 and 102 J kg(-1) for a 2 T magnetic field change along with a negligible hysteresis loss, making this material a promising candidate for magnetic refrigeration. In order to eliminate the drawbacks due to the use of multistep nonlinear fitting in a conventional manner, the field dependence of magnetic entropy change was applied to study the critical behavior. As expected, our results are consistent with the values derived for the 3D-Heisenberg model.
机译：通过固相反应法合成了La0.7Sr0.25K0.05MnO3（LSKMO0.05）锰矿化合物。 X射线衍射分析表明，该样品在扭曲的菱面体系统中结晶，其中R（3）位于整个巴克空间群上。磁性研究表明，在居里温度TC = 332 K时，顺磁性（PM）-铁磁性（FM）发生了二阶跃迁。此外，等温测量的磁化强度使我们能够通过热力学麦克斯韦关系确定磁熵变（Delta SM ）。发现对于2 T磁场，最大磁熵变（Delta S-max）和相对冷却功率（RCP）分别为2.37 J kg（-1）K-1和102 J kg（-1）的变化以及可忽略的磁滞损耗，使这种材料成为磁制冷的有希望的候选者。为了消除以常规方式使用多步非线性拟合带来的弊端，将磁熵变的场相关性应用于研究临界行为。正如预期的那样，我们的结果与3D-海森堡模型得出的值一致。

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