کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1624169 | 1516416 | 2008 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure and magnetocaloric effect in Gd5Si2(Ge1âxGax)2 alloys
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
Crystal structure of the phases, microstructure and magnetocaloric effect were investigated in Gd5Si2(Ge1âxGax)2 alloys with x = 0, 0.01, 0.02 and 0.03. The phase identification and compositional analysis were carried out by a combination of X-ray diffraction, scanning electron microscopy and electron probe micro-analysis. The Gd5Si2Ge2-type matrix phase having an orthorhombic structure co-exists with Gd5Ge3-type and GdGe-rich phases. Ga was found to have preferentially partitioned to the orthorhombic Gd5Si2Ge2-type matrix phase. Magneto-structural transition temperatures determined from differential scanning calorimetry and thermo-magnetic techniques revealed that Ga substituted alloys exhibit only magnetic transition unlike parent Gd5Si2Ge2 alloy which displays both structural and magnetic transitions. A maximum magnetic entropy change (ÎS)M of 7.0 J/kg K was obtained in x = 0 alloy for a magnetic field change of 2 T and its magnitude was lower in the Ga substituted alloys.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 461, Issues 1â2, 11 August 2008, Pages 14-20
Journal: Journal of Alloys and Compounds - Volume 461, Issues 1â2, 11 August 2008, Pages 14-20
نویسندگان
D.M. Raj Kumar, M. Manivel Raja, R. Gopalan, R. Balamuralikrishnan, A.K. Singh, V. Chandrasekaran,