Effect of annealing on the structure and magnetocaloric properties of Gd5Ge2(Si2-xAlx ) compounds
All the samples of Gd5Ge2(Si2-xAlx)(x= 0, 0.1, 0.2, 0.5) were produced by arc melting under argon atmosphere. The crystal structures of all samples crystallized in the orthorhombic structure are studied by X-ray powder diffraction (XRD). The crystal symmetry is preserved while the content of Al changes. By Lakeshore VSM, we have measured M-T curves and M-H curves of the samples at different temperatures. The result shows that the magnetocaloric effect of Gd5Ge2Si2-xAlx) is the largest one in all samples at their Curie temperatures, which is 1.4J.Kg-1.k-1 where x = 0.2. The magnetic-entropy changes are small before and after annealing, which indicated that the uniform magnetocaloric effect phase had been formed before annealing.
crystal structure Curie temperature magnetic-entropy change magnetocaloric effect
Yong Xin Xinfa Deng Guangshen Luo
School of Sciences Nanchang University Nanchang 330031, China School of Materials Science and Engineering Nanchang University Nanchang 330031, China
国际会议
哈尔滨
英文
363-367
2011-08-12（万方平台首次上网日期，不代表论文的发表时间）