کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8158611 | 1524880 | 2013 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effect deficient of strontium on structural, magnetic and magnetocaloric properties of La0.57Nd0.1Sr0.33âxMnO3 (x=0.1 and 0.15) manganite
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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 have investigated the effect of nominal strontium deï¬ciency on the structure, magnetic and magnetocaloric properties of La0.57Nd0.1Sr0.33âxMnO3 (x=0.1 and 0.15), [LNS0.23MO and LNS0.18MO] manganese perovskites. The polycrystalline samples have been elaborated by the conventional ceramic method at 1673 K. The refinement of the structure by the Rietveld method revealed that these compounds crystallize in a rhombohedral (R3¯C) perovskite structure. Magnetization as a function of temperature shows that these compounds exhibit a paramagnetic to ferromagnetic phase transition with decreasing temperature. The ferromagnetic transition temperature (TC) decreases from 339 K for x=0.1 to nearly the room temperature 315 K for x=0.15 with increasing nominal strontium content. A large magnetic entropy change|ÎSM|deduced from isothermal magnetization curves, has been observed in our samples with a peak centered around their respective TC. The maximum of the magnetic entropy change |ÎSMmax| in a magnetic field change of 5 T is found to be 4.42, 4.36 Jkgâ1 Kâ1 for x=0.10, 0.15 respectively. The ï¬eld dependence of the magnetic entropy change is also analyzed showing the power law dependence, ÎSMâHn where n=0.684(1) for x=0.1 and n=0.714(4) for x=0.15 at their respective transition temperatures. Large relative cooling power value of 214 Jkgâ1 is obtained for La0.57Nd0.1Sr0.18MnO3 sample, at a field change of 5 T. This relatively large value associated to a curie temperature of 315 K make the present compound a promising candidate for magnetic refrigerators around room temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 340, August 2013, Pages 91-96
Journal: Journal of Magnetism and Magnetic Materials - Volume 340, August 2013, Pages 91-96
نویسندگان
S. Mnefgui, A. Dhahri, N. Dhahri, El.K. Hlil, J. Dhahri,