Phase separation and magnetocaloric effect in Pr0.5-xGdxSr0.5MnO3 system

被引：29

作者：

Bourouina, M. ^{[1
]}

Krichene, A. ^{[1
]}

Boudjada, N. Chniba ^{[2
]}

Boujelben, W. ^{[1
]}

机构：

[1] Univ Sfax, Fac Sci Sfax, Lab Phys Mat, BP 1171, Sfax 3000, Tunisia

[2] Inst Neel, BP 166, F-38042 Grenoble 9, France

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 680卷

关键词：

Perovskite manganite; Magnetocaloric effect; Phase separation; Magnetic properties; MAGNETIC-PROPERTIES; GD; TEMPERATURE; X=0;

D O I：

10.1016/j.jallcom.2016.04.135

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The magnetic properties and the magnetocaloric effect have been studied in Pr0.5-xGdxSr0.5MnO3 (x = 0, 0.05 and 0.1) manganites prepared by the solid state reaction method. Magnetic measurements versus temperature in an applied magnetic field of 0.05 T show that the all samples exhibit a paramagnetic to ferromagnetic transition when temperature decreases. The x = 0.1 sample shows a clear transition, from the ferromagnetic state to the antiferromagnetic one at T-N = 125 K. The Curie temperature decreases gradually with increasing gadolinium content. The absolute values of the maximum of magnetic entropy change vertical bar Delta S-M vertical bar for an applied magnetic field of 2 T are equal to1.26, 1.25 and 1.02 J kg(-1) K-1 for x = 0, 0.05 and 0.1, respectively. The decrease of vertical bar Delta S-M vertical bar with Gd doping can be attributed to the enhancement of phase separation phenomenon. The magnetic entropy curves follow the universal law corresponding to the second-ordered paramagnetic-ferromagnetic transition. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：67 / 72

页数：6

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