کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5461558 | 1516202 | 2017 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Universal curves in assessing the order of magnetic transition of La0.7âxPrxCa0.3MnO3 compounds exhibiting giant magnetocaloric effect
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Universal curves in assessing the order of magnetic transition of La0.7âxPrxCa0.3MnO3 compounds exhibiting giant magnetocaloric effect Universal curves in assessing the order of magnetic transition of La0.7âxPrxCa0.3MnO3 compounds exhibiting giant magnetocaloric effect](/preview/png/5461558.png)
چکیده انگلیسی
The magnetic properties of La0.7-xPrxCa0.3MnO3 (x = 0.0, 0.2, 0.3, 0.4, and 0.5) compounds fabricated by a solid-state reaction are studied by using Arrott plots and universal curves. The Arrott plots near the Curie temperature show negative slopes over the entire magnetic field range up to 50 kOe, indicating a first-order magnetic phase transition (according to Banerjee's criterion) for the x = 0.0, 0.2, 0.3, and 0.4 samples. For the x = 0.5 sample, however, the plots show positive slopes at low magnetic fields below 10 kOe, indicating a second-order transition. These results are further checked by universal curves of the normalized entropy change versus reduced temperature. The universal curves show a divergence among the curves with different magnetic fields for a first-order magnetic transition, but for a second-order transition, they collapse onto the same curve. The Curie temperature, around which the maximum magnetic entropy change occurs, decreases continuously from 260 to 110 K as x increases from 0.0 to 0.5. In the same x range, the maximum entropy change measured at a magnetic field span of 50 kOe decreases from 10.70 to 7.14 J/kg K, but the relative cooling power increases from 278 to 380 J/kg under the same magnetic field span.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 692, 25 January 2017, Pages 687-692
Journal: Journal of Alloys and Compounds - Volume 692, 25 January 2017, Pages 687-692
نویسندگان
T.A. Ho, S.H. Lim, T.L. Phan, S.C. Yu,