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Enyao Zhang Yungui ChenTiebang Zhang Yongbai TangMingjing Tu 《Journal of magnetism and magnetic materials》2006
The crystal structure and magnetocaloric effect of Gd5SixSn4−x (with x=2.4, 2.6 and 2.8) alloys were studied by means of X-ray power diffraction (XRD) and magnetic measurements. From the XRD results, these alloys adopt a Gd5Si4-type structure for x=2.8, Gd5Si4-type and Gd5Si2Ge2-type mixed structures for x=2.4 and 2.6, while some minor phases can also be found. The Curie temperatures of the Gd5SixSn4−x increases gradually when x increases from 276 K for x=2.4, to 301.5 K for x=2.8. Magnetic entropy changes of these alloys at a magnetic field change of 0–1.8 T are 1.88, 2.26 and 1.69 J/kg K for x=2.4, 2.6 and 2.8, respectively. The temperature-dependent XRD analysis shows that there is no crystallographic transition for these alloys, which can explain their low magnetic entropy changes. 相似文献
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