Magnetic and Magnetocaloric Properties of La0.65Ca0.35MnO3/La0.7Ca0.2Ba0.1MnO3 and La0.65Ca0.35MnO3/Pr0.5Sr0.5MnO3 Composite Manganites

被引：3

作者：

Sellami-Jmal, E. ^{[1
]}

Regaieg, Y. ^{[1
,2
]}

Cheikhrouhou-Koubaa, W. ^{[1
,3
]}

Koubaa, M. ^{[1
]}

Cheikhrouhou, A. ^{[1
]}

Njah, N. ^{[4
]}

机构：

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

[2] Univ Paris Diderot, Sorbonne Paris Cite, ITODYS, CNRS UMR 7086, F-75205 Paris, France

[3] Ctr Rech Informat Multimedia & Traitement Numer D, Sakiet Ezzit 3021, Tunisia

[4] Sfax Univ, Fac Sci Sfax, Lab Georessources Environm Mat & Changements Glob, Sfax 3000, Tunisia

来源：

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM | 2015年 / 28卷 / 10期

关键词：

Composites; Manganites; X-ray diffraction; Electron microscopy; Magnetocaloric effect; ROOM-TEMPERATURE; MAGNETORESISTANCE;

D O I：

10.1007/s10948-015-3135-1

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

La0.65Ca0.35MnO3/La0.7Ca0.2Ba0.1MnO3 (COMPI) and La0.65Ca0.35MnO3/Pr0.5Sr0.5MnO3 (COMPII) composite manganites were prepared using a conventional ceramic double-sintering process. The microstructural, magnetic and magnetocaloric properties of the composites were investigated using scanning electron microscopy (SEM) and vibrating sample magnetometry (VSM). X-ray diffraction analysis using Rietveld refinement shows that the starting La0.65Ca0.35MnO3, La0.7Ca0.2Ba0.1MnO3 and Pr0.5Sr0.5MnO3 manganites are single phases and crystallize in the orthorhombic system with a Pbnm space group. Magnetization measurements versus temperature for each composite reveal two magnetic transition temperatures associated to both manganites, which induces an enlargement of the magnetic entropy change peak. A better relative cooling power (RCP) value of 308 J kg(-1) around 280 K is obtained for COMPI and is about 75 % of that observed in pure Gd, which makes our composite a potential candidate for magnetic refrigeration around room temperature.

引用

页码：3121 / 3126

页数：6

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