کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7998846 | 1516252 | 2015 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhancement of magnetocaloric effect in CoMn0.9Fe0.1Ge alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
The magnetic and magnetocaloric properties of CoMn0.9Fe0.1Ge alloy has been investigated by using of electron microscopy, X-ray diffraction, calorimetric, heat capacity and magnetic measurements. The substitution of Fe atoms for Mn atoms in the CoMnGe system leads to a decrease in the martensitic transition temperature from 650Â K to room temperature (RT) and presents the magnetostructural properties in vicinity of RT. In order to assess MCE, temperature dependent of magnetization measurements have performed under applying variable magnetic fields. The largest entropy change values are â34.9Â JÂ kgâ1Â Kâ1 (magnetization) and â33.6Â JÂ kgâ1Â KÂ â1 (demagnetization) for ÎH=5T. The adiabatic temperature change value of CoMn0.9Fe0.1Ge is calculated 8.5Â K for 2Â T from magnetic and heat capacity measurements. The density of states of electrons at Fermi level and the Debye temperature values of this alloy are found 1.19 states eVâ1Â atomâ1 and 353Â K from low temperature heat capacity measurements. This giant magnetocaloric effect makes this material a very promising candidate for future RT cooling applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 641, 25 August 2015, Pages 69-73
Journal: Journal of Alloys and Compounds - Volume 641, 25 August 2015, Pages 69-73
نویسندگان
E. Yüzüak, I. Dincer, Y. Elerman, I. Dumkow, B. Heger, S. Yuce Emre,