Characterization and theoretical investigation of the magnetocaloric effect of La0.67Ba0.33Mn1-xSbxO3 compounds

被引:12
|
作者
Ben Hassine, A. [1 ]
Dhahri, A. [1 ]
Bouazizi, L. [2 ]
Oumezzine, M. [1 ]
Hlil, E. K. [3 ]
机构
[1] Fac Sci, Dept Phys, Lab Phys Chem Mat, Tunis, Tunisia
[2] Prince Sattam Bin Abdulaziz Univ, Coll Engn, Alkharj 11942, Saudi Arabia
[3] Univ Grenoble 1, CNRS, Inst Neel, BP166, F-38042 Grenoble, France
关键词
Perovskite; Magnetocaloric effect; Phenomenological model; TRANSPORT-PROPERTIES;
D O I
10.1016/j.ssc.2016.02.005
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
In this study, the structural, magnetic and magnetocaloric properties of the polycrystalline La0.67Ba0.33Mn1-xSbxO3 (x=0.01, x=0.03 and x=0.07) were consistently investigated. X-ray analysis revealed that the substitution of Mn by Sb produced no considerable structural change just the diffraction peaks of rhombohedric symmetry were obtained all the samples. The variation of the magnetization M versus temperature T, under an applied magnetic field of 1.5 T, shows a ferromagnetic-paramagnetic transition. The experimental results exhibit that with the increase of Sb substitution T-c decreases from 326 K to 296 K. The prediction of magnetic entropy change, relative cooling power and specific heat for magnetic field variation were predicted with the help of a phenomenological model. A large magneto-caloric effect has been observed, the maximum of magnetic entropy change, broken vertical bar Delta S-m(max)broken vertical bar reaches the highest value of 2.74 J kg(-1) K-1 under a magnetic field of 1.5 T with an RCP value of 132.8 J kg(-1) for La0.67Ba0.33M1-xSbxO3 (x=0.07) composition, which will be an interesting compound for application materials working as magnetic refrigerants near room temperature. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:6 / 10
页数:5
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