کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1613213 | 1516313 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental study of the magnetocaloric effect in Dy1âxErxCo2 solid solutions doped with Gd
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Magnetic and magnetocaloric properties of polycrystalline (Dy0.9Er0.1)1âxGdxCo2 (0.0 ⩽ x ⩽ 0.25) solid solutions were investigated experimentally using magnetic measurements. The magnetization behavior and magnetic transition are analyzed in terms of Landau theory. Powder X-ray diffraction analysis performed at room temperature showed that all (Dy0.9Er0.1)1âxGdxCo2 (0.0 ⩽ x ⩽ 0.25) solid solutions are C15 cubic Laves phase with the MgCu2-type structure. The lattice parameter increases from 0.7187 for Dy0.9Er0.1Co2 to 0.7204 nm for (Dy0.9Er0.1)0.75Gd0.25Co2. In this case, the Curie temperature increases from 128 K to 215 K for. At higher temperatures, all solid solutions are Curie-Weiss paramagnets. The isothermal entropy change âÎSmag was calculated using magnetic measurements data and thermodynamic Maxwell's relation. A decrease in the entropy change has been observed with increasing Gd content. Under an external field change of from 0 to 3 T, the maximum entropy change for these compounds decreases from 8.5 at x = 0.0 to 3.1 J/kg K at x = 0.25. The refrigerant capacity of the (Dy0.9Er0.1)1âxGdxCo2 solid solutions (with 0.0 ⩽ x ⩽ 0.25) is presented. The effect of increasing Gd content in the (Dy0.9Er0.1)1âxGdxCo2 solid solutions on their magnetic and magnetocaloric properties is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 580, 15 December 2013, Pages 341-347
Journal: Journal of Alloys and Compounds - Volume 580, 15 December 2013, Pages 341-347
نویسندگان
J. Äwik,