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首页> 外文期刊>Solid State Communications >Effect of Mn-site vacancies on the magnetic entropy change and the Curie temperature of La0.67Ca0.33Mn1-xO3 perovskite
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Effect of Mn-site vacancies on the magnetic entropy change and the Curie temperature of La0.67Ca0.33Mn1-xO3 perovskite

机译：锰空位对La0.67Ca0.33Mn1-xO3钙钛矿磁熵变和居里温度的影响

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摘要

Single-phase polycrystalline samples of La0.67Ca0.33Mn1-xO3 (x = 0.00, 0.02, 0.04, 0.06) have been prepared using the sol-gel method. The structure, magnetocaloric properties and the Curie temperature of the samples with different Mn vacancy concentrations have been investigated. The experimental results show that vacancy doping at the Mn-sites has a significant influence on the magnetic properties of La0.67Ca0.33Mn1-xO3. The Curie temperature decreases monotonically with increasing the Mn-site vacancy concentration x. A remarkable enhancement of the magnetic entropy change has been obtained in the La0.67Ca0.33W0.98O3 sample. The entropy change reaches vertical bar Delta S-M vertical bar = 3.10 J kg(-1) K-1 at its Curie temperature (264 K) under an applied magnetic field H = 10 kOe, which is almost the same value as that of pure Gd. (c) 2006 Elsevier Ltd. All rights reserved.
机译：使用溶胶-凝胶法制备了La0.67Ca0.33Mn1-xO3（x = 0.00、0.02、0.04、0.06）的单相多晶样品。研究了不同Mn空位浓度的样品的结构，磁热性能和居里温度。实验结果表明，Mn位点的空位掺杂对La0.67Ca0.33Mn1-xO3的磁性能有显着影响。居里温度随着Mn-位空位浓度x的增加而单调降低。在La0.67Ca0.33W0.98O3样品中，磁熵变得到了显着增强。在施加的磁场H = 10 kOe下，其居里温度（264 K）时，熵的变化达到垂直线Delta SM垂直线= 3.10 J kg（-1）K-1，该值几乎与纯Gd的值相同。 （c）2006 Elsevier Ltd.保留所有权利。

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