کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8163830 | 1525661 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of K addition on the magnetic and magnetocaloric properties of La2-xKxNiMnO6 (xâ¯=â¯0, 0.2 and 0.4) double perovskite
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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
The structural and magnetic properties of La2-xKxNiMnO6 (xâ¯=â¯0, xâ¯=â¯0.2 and xâ¯=â¯0.4) synthesized by a sol gel method have been investigated. Refinements of X-ray diffraction data reveal that our compositions crystallized in monoclinic structure with P21/n space group. Double magnetization transition are observed from the magnetization measurements versus temperature (TC1 at high temperature and TC2 at low temperature) and can be ascribed to Ni2+-O-Mn4+ and Ni3+-O-Mn3+ superexchange interactions, respectively. Based on Banerjee criterion, the nature of magnetic transition is of second order for all synthesized samples. The magnetic entropy change was calculated from the measurement of isothermal magnetization versus magnetic field at different temperatures. The maximum (âÎSMmax) under a magnetic field of 5â¯T is found to be 1.17â¯J/kg K, 1.10â¯J/Kg and 0.96â¯J/Kg K for xâ¯=â¯0, xâ¯=â¯0.2 and xâ¯=â¯0.4, respectively. The relative cooling power (RCP) increases with K doping and reaches 173â¯J/kg for xâ¯=â¯0.4.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity and its Applications - Volume 553, 15 October 2018, Pages 13-16
Journal: Physica C: Superconductivity and its Applications - Volume 553, 15 October 2018, Pages 13-16
نویسندگان
N. Ouled Nasser, E. Zghal, F Ayadi, M. Koubaa, W. Cheikhrouhou-Koubaa, A. Cheikhrouhou,