کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5490110 | 1524777 | 2017 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Transformation behavior and magnetocaloric effect in Mn1âxCrxCoGe (x = 0.04 and 0.11) melt-spun ribbons tailored by heat treatment
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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
Recently, MnNiGe and MnCoGe intermetallic compounds have received a considerable attention due to the coupled tunable martensitic and magnetic transitions as well as giant magnetocaloric effect (MCE) they exhibit. In this work, by doping with Cr and varying of the annealing regime, a merged magnetostructural transition between a ferromagnetic orthorhombic and a paramagnetic hexagonal structure was received near room temperature in Mn1âxCrxCoGe melt-spun ribbons with x = 0.04 and 0.11. Structural and magnetic characterizations have been performed by X-ray diffraction, differential scanning calorimetry and magnetization measurements. It is found that, in ribbons with x = 0.04 (0.11) annealed at 1148 K, the peak value of the magnetic entropy change and the refrigerant capacity through the orthorhombic to hexagonal transition strongly increase with the annealing time from 7.3 (9.4) Jkgâ1 Kâ1 to 10.6 (13.7) Jkgâ1 Kâ1 and from 182 (235) Jkgâ1 to 214 (267) Jkgâ1, respectively, at 5 T for the time increase from 4 h to 8 h. Compared to bulk alloys of similar composition, the fabricated melt-spun ribbons show much broader working temperature range and a higher cooling efficiency.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 444, 15 December 2017, Pages 263-269
Journal: Journal of Magnetism and Magnetic Materials - Volume 444, 15 December 2017, Pages 263-269
نویسندگان
Gerardo Daniel-Pérez, J.L. Sánchez Llamazares, P. Alvarez-Alonso, C.F. Sánchez-Valdés, R. Varga, V. Chernenko, A. Quintana-Nedelcos,