کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8156876 | 1524857 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Large magnetocaloric effect in lanthanum-deficiency manganites La0.8âxâ¡xCa0.2MnO3 (0.00â¤xâ¤0.20) with a first-order magnetic phase transition
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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
Lanthanum-deficiency effect on the magnetic and magnetocaloric properties of La0.8âxâ¡xCa0.2MnO3 (0.00â¤xâ¤0.20) polycrystalline samples has been investigated using X-ray diffraction and magnetization measurements. The structural characterization has revealed that all samples are crystallized in the orthorhombic structure with Pnma space group. From magnetic measurement a first-order magnetic phase transition from ferromagnetic to paramagnetic state is observed at the Curie temperature (TC) which is found to increase from 236.5 to 247 K when lanthanum-deficiency rate increases. Besides, both magnetocaloric effect (MCE) and relative cooling power (RCP) has been estimated. As important result, the values of MCE and RCP in our managanite with Lanthanum-deficiency are reported to be near to those found in the gadolinium considered as magnetocaloric material reference. Finally, the first-order magnetic phase transition has been confirmed by the construction of the universal curve of the magnetic entropy change.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 364, September 2014, Pages 5-10
Journal: Journal of Magnetism and Magnetic Materials - Volume 364, September 2014, Pages 5-10
نویسندگان
R. Skini, A. Omri, M. Khlifi, E. Dhahri, E.K. Hlil,