کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5490044 | 1524778 | 2017 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magnetic and magnetocaloric properties of Sm1âxCaxMnO3 (x = 0.88) nanoparticles
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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
We used the mechanical milling to prepare orthorhombic Sm0.12Ca0.88MnO3 samples with the average crystallite size (d) changing from 100 to 139 nm. Their magnetic and magnetocaloric properties were then studied upon magnetization data versus the temperature and magnetic field, M(T, H). The results revealed the samples undergoing the ferromagnetic-paramagnetic (FM-PM) phase transition at the Curie temperature TC â 110 K. Around this transition, the magnetic-entropy change (ÎSm) reaches the maxima. The maximum |ÎSm| values are about 2-4 J·kgâ1·Kâ1, corresponding to relative cooling power of 35-60 J·kgâ1, for an applied field H = 30 kOe. The assessments based on Banerjee's criteria and constructing a universal curve for |ÎSm(T, H)| data indicate the samples having the nature of a second-order phase transition. Also, the detailed analyses based on the Curie-Weiss law and magnetic-order exponent prove the existence of the Griffiths phase and magnetic inhomogeneity in the samples. These properties would be changed by changing d.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 443, 1 December 2017, Pages 233-238
Journal: Journal of Magnetism and Magnetic Materials - Volume 443, 1 December 2017, Pages 233-238
نویسندگان
T.L. Phan, N.T. Dang, T.A. Ho, J.S. Rhyee, W.H. Shon, K. Tarigan, T.V. Manh,