کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1594337 | 1515693 | 2008 | 4 صفحه PDF | دانلود رایگان |
In this paper, structural, microstrucutural and magnetocaloric properties of Ni2.18Mn0.82Ga alloys submitted to high-energy ball milling are reported. A 7-layered orthorhombic martensitic (Pnnm) phase was detected in post-milling annealed samples, which reached a microstrucuture composed predominantly by nanograins. The magnetocaloric effect is strongly weakened in comparison with as-cast samples of similar composition. This effect can be attributed to the absence of the mesoscale twin-related martensitic variants in the nanostructurated powders. However, post-milled samples annealed at 1123 K for 4 h present relative cooling powers as high as those observed for manganites. Therefore, these materials can be considered as potential candidates for use as regenerators in prototypal magnetic refrigerators.
Journal: Solid State Communications - Volume 148, Issues 7–8, November 2008, Pages 289–292