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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >The effect of the annealing temperature on the structural and magnetic properties of the manganites compounds
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The effect of the annealing temperature on the structural and magnetic properties of the manganites compounds

机译：退火温度对锰化合物结构和磁性的影响

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摘要

The electron-doped manganites La_(1-x)Ce_xMnO_3 (x = 0.3, 0.4 and 0.5) compounds were prepared by the sol-gel method and annealed at two different temperatures of 1400 °C and 900 °C The morphology, crystallographic and magnetic properties of these compounds were studied as function of annealing temperature. The morphology study shows a decrease of the grain size for the temperature of 900 °C. The grain size is found to affect the structure which is confirmed by the Rietveld refinements of X-ray diffraction revealing a transition from the orthorhombic phase to the rhombohedral one when decreasing the annealing temperature from 1400 °C to 900 °C. This transition is accompanied by an enhancement of the one-electron bandwidth inducing an increase of the magnetization and the Curie temperature. The magnetocaloric study indicates the existence of a transition from second to first order when decreasing annealing temperature from 1400 °C to 900 °C.
机译：通过溶胶-凝胶法制备了电子掺杂的锰酸盐La_（1-x）Ce_xMnO_3（x = 0.3、0.4和0.5）化合物，并在1400°C和900°C的两个不同温度下进行了退火。研究了这些化合物的性质与退火温度的关系。形态研究表明，温度为900°C时，晶粒尺寸减小。发现晶粒尺寸会影响组织，这通过X射线衍射的Rietveld精炼得到证实，揭示了当将退火温度从1400°C降低到900°C时，从正交晶相过渡到菱面体相的过程。这种转变伴随着单电子带宽的增加，导致磁化强度和居里温度的增加。磁热研究表明，当退火温度从1400°C降至900°C时，存在从二阶到一阶的转变。

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