Effect of Fe substitution on the structure and magnetocaloric effect of Mn5-xFexGeSi2 alloys

被引：5
作者：
Sun, Y. W. [1 ]
Yan, J. L. [1 ]
Feng, E. L. [1 ]
Tang, G. W. [1 ]
Zhou, K. W. [1 ]
机构：
[1] Guangxi Univ, Coll Mat Sci & Engn, Nanning 530004, Guangxi, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2017年 / 422卷
基金：
中国国家自然科学基金;
关键词：
Mn5Ge3; Crystal structure; Curie temperature; Magnetocaloric effect; MAGNETIC-PROPERTIES; CRYSTAL;
D O I：
10.1016/j.jmmm.2016.09.007
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structure and magnetocaloric effect of Mn5-xFexGeSi2 compounds were studied.Analysis of X-ray powder diffraction and energy dispersive X-Ray spectroscopy revealed that Mn(5-x)Fe(x)GeSi(2)alloys with x < 1 crystallize in the Mn5Si3-type structure (space group P6(3)/mcm), maintaining the structure of Mn5Ge3; and alloys with x=1.5 and 2 consist of the major Mn5Si3-type phase and the minor Ni(2)ln-type phase (space group P6(3)/mmc). The results of Rietveld refinement showed that the cell parameters for the Mn5Si3-type phase decrease with increasing Fe content. The positive slopes in Arrott plots indicate that a second-order ferromagnetic to paramagnetic transition occurs. The Curie temperature increases with increasing Fe content from 182 K for x=0.6 to 224 K for x=2. The maximum magnetic entropy change of 3.7J/(kg K) for x=0.8 was found under a magnetic field change of 0-20 kOe. (C) 2016 Elseveier B.V.All rights reserved.
引用
收藏
页码：356 / 361
页数：6
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