کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10128950 | 1645163 | 2019 | 19 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Changes in structural, magnetic and magnetocaloric properties due to homogenization annealing in Ni54Mn19Ga27
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Structural and magnetic transformations in the Heusler system Ni54Mn19Ga27 due to different annealing time are studied by X-ray diffraction (XRD) and magnetization measurements. The developing of inter-martensitic and second order phase transition are investigated as a function of the annealing time. Analysis of the XRD data reveals that the austenite state has an L21 structure, whereas the structures of the martensite is a 14M (tetragonal) and the alloy crystallizes in the mixture phase at room temperature. In magnetic measurements, these martensite and austenite phases are ferromagnetic and due to ferromagnetic exchange caused different Curie temperatures for the austenitic and martensitic states in the sample with as prepared, 0.5 and 1â¯h except 5â¯h. The saturation magnetization changed from 35 to 68â¯Aâ¯m2â¯kgâ1 and the coercivity of these decreased from 1.8 to 0.3â¯mT as a function of annealing time. And also, the magnetic entropy change was determined to be 2.4â¯Jâ¯kgâ1â¯Kâ1 for as-prepared sample and 5.4â¯Jâ¯kgâ1â¯Kâ1 for 5â¯h sample. At 2â¯T magnetic field, the calculated relative cooling power (RCP) values for all alloys were found to be 85.8, 113.8, 120.8, 169.1â¯Jâ¯kgâ1 as annealing time increase.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 469, 1 January 2019, Pages 183-188
Journal: Journal of Magnetism and Magnetic Materials - Volume 469, 1 January 2019, Pages 183-188
نویسندگان
Atakan Tekgül, KaÄan Åarlar, İlker Küçük,