期刊
CERAMICS INTERNATIONAL
卷 41, 期 6, 页码 7723-7728出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.02.103
关键词
X-ray diffraction; Magnetization; Magnetocaloric effect; Manganites
资金
- Tunisian Ministry of Higher Education and Scientific Research
- Neel Institute
In this work, we report the effect of low amount of cobalt doping at the Mn-site on the magnetic and magnetocaloric properties of Pr0.7Ca0.3Mn1-xCoxO3 (0 <= x <= 0.1) powder samples. Our samples, elaborated using the solid solid reaction method at high temperature, are single phase and crystallize in the orthorhombic system with Pnma space group. While the parent compound Pr0.7Ca0.3MnO3 exhibits a charge order state at low temperature, the substituted samples with low amount of cobalt exhibit a paramagnetic to ferromagnetic transition with decreasing temperature. The Curie temperature T-C increases with Co content from 105 K for x=0 to 116 K for x=0.1. The maximum values of the magnetic entropy change vertical bar Delta S-M(max)vertical bar are found to be 0.8 J/kg K, 2.2 J/kg K, 3.1 J/kg K and 3.2 J/kg K in a magnetic field change of 5 T for x=0, 0.02, 0.05 and 0.1 respectively. The maximum value of the relative cooling power RCP is found to be 378.2 J/kg in the Pr0.7Ca0.3Mn0.95Co0.05O3 at 5 T. This value of RCP is about 92% of that obtained in gadolinium metal, known as one of the most important materials for magnetic refrigeration, at the same magnetic field change of 5 T. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据