Abstract The effect of slight changes of the chemical composition on Magneto-caloric properties of manganite was investigated on a series of ceramic nano-particles of La0.6-xGdxSr0.4MnO3 (x = 0, 0.0125, 0.05, 0.10) where they synthesized using the Sol-gel method. The X-ray powder diffraction data and the Rietveld refinement analysis indicated that the gradual replacement of La with Gd reduced the cell volume acting in a comparable manner to applying external pressure. Similarly, the magnetization measurements as a function of temperature on all La0.6-xGdxSr0.4MnO3 samples showed a ferromagnetic transition, in which the transition temperature reduced as x increased. The calculated magnetic entropies of all samples of La0.6-xGdxSr0.4MnO3 as a function of temperature suggest a magneto-caloric effect similar to that of pure Gd. These results provide evidence that La0.6-xGdxSr0.4MnO3 compounds have a potential for magnetic refrigeration application.

中文翻译：

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Gd离子取代对La0.6-xGdxSr0.4MnO3(x=0. 0.0125, 0.05,0.10)锰矿磁热效应的影响

摘要 在一系列 La0.6-xGdxSr0.4MnO3 (x = 0, 0.0125, 0.05, 0.10) 陶瓷纳米颗粒上研究了化学成分的微小变化对锰矿磁热性能的影响溶胶-凝胶法。X 射线粉末衍射数据和 Rietveld 精修分析表明，用 Gd 逐渐替代 La 减少了电池体积，其作用与施加外部压力的方式相当。类似地，在所有 La0.6-xGdxSr0.4MnO3 样品上作为温度函数的磁化测量显示铁磁转变，其中转变温度随着 x 的增加而降低。La0.6-xGdxSr0.4MnO3 的所有样品的计算磁熵作为温度的函数表明磁热效应类似于纯 Gd 的磁热效应。