Magnetocaloric effect in layered perovskite manganese oxide La1.4(Sr1-xBax)1.6Mn2O7 (0≤x≤0.6) bulk materials

被引：23

作者：

Cherif, K.

Zemni, S.

Dhahri, J. ^{[1
]}

Ournezzine, M.

Said, M.

Vincent, H.

机构：

[1] Fac Sci Monastir, Lab Phys Solides, Dept Phys, Monastir 5019, Tunisia

[2] Fac Sci Monastir, Lab Physicochim Strucr, Dept Phys, Monastir 5019, Tunisia

[3] Ecole Natl Super Phys Grenoble, Mat & Genie Phys Lab, F-38402 St Martin Dheres, France

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2007年 / 432卷 / 1-2期

关键词：

perovskite; Ruddlesden-Popper compounds; magnetocaloric effect;

D O I：

10.1016/j.jallcom.2006.06.007

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 magnetocaloric effect in the bilayered Ruddlesden-Popper perovskites La-1.4(Sr1-xBax)(1.6)Mn2O7 (0 <= x <= 0.6) prepared by sol-gel methods have been investigated. The dependence of magnetization M on applied magnetic field H and temperature T was measured carefully near the Curie temperature T-C for all samples. The experimental results indicate that T-C decreases from 161 to 94 K with increasing Ba substitution. With increasing Ba concentration, an increase in the values of magnetic entropy is observed (1.95 J kg(-1) K-1 <= vertical bar Delta S-M(max)vertical bar <= 2.84 J kg(-1) K-1) at Delta H = 2 T. (c) 2006 Elsevier B.V. All rights reserved.

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页码：30 / 33

页数：4

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