کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10623989 | 989582 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study of physical properties of cobalt substituted Pr0.7Ca0.3MnO3 ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
An investigation on single phase semiconducting polycrystalline Pr0.7Ca0.3MnO3 and Pr0.7Ca0.3MnCo0.1O3 crystallized in the orthorhombic system with Pnma space group is reported. We found that ÏDC increases when introducing Co for T<110Â K but for T>110Â K, it decreases. Also, the contribution of hopping process in conduction mechanism was in agreement with the Jonscher law and Mott theory. Capacitance was extensively dependent on temperature and frequency. A dielectric transition was observed at T=150Â K for the doped compound. The temperature dependence of dielectric permittivity is well described by Curie-Weiss law. The parameter of deviation from Curie-Weiss behavior to modified Curie-Weiss law is found to be ÎTm=30Â K. The substitution of Mn by Co was found to destroy the charge order state observed in the parent compound and to induce a ferromagnetic phase at low temperature. The cobalt-substituted sample exhibits a maximum value of magnetic entropy change |âSmax|=3.2Â JÂ kgâ1Â Kâ1and a large relative cooling power with a maximum value of 301Â J/kg under an applied field of 5Â T. Technically, these large values make the prepared material very promising for magnetic refrigeration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 42, Issue 5, April 2016, Pages 6145-6153
Journal: Ceramics International - Volume 42, Issue 5, April 2016, Pages 6145-6153
نویسندگان
R. M'nassri, M. Khelifi, H. Rahmouni, A. Selmi, K. Khirouni, N. Chniba-Boudjada, A. Cheikhrouhou,