A study of structural, magnetic and magnetocaloric properties of (1-x)La0.6Ca0.4MnO3/xMn2O3 composite materials

被引：9
作者：
El Boukili, A. [1 ,2 ]
Mounkachi, O. [1 ]
Hamedoun, M. [2 ]
Lachkar, P. [3 ]
Hlil, E. K. [3 ]
Benyoussef, A. [4 ]
Balli, M. [5 ]
Ez-Zahraouy, H. [1 ]
机构：
[1] Mohammed V Univ Rabat, LaMCScI Lab, Fac Sci, BP 1014, Rabat, Morocco
[2] MAScIR Fdn, Mat & Nanomat Ctr, BP 10100 Rabat, Rabat, Morocco
[3] Univ Grenoble Alpes, Inst Neel, Grenoble INP, CNRS, F-38000 Grenoble, France
[4] Hassan II Acad Sci & Technol, Rabat, Morocco
[5] Int Univ Rabat, Coll Engn & Architecture, AMEEC Team, LERMA, Parc Technopolis, Rocade De Rabat 11100, Sale, Morocco
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 859卷
关键词：
Composites; Magnetic properties; Magnetocaloric effect; Refrigeration applications;
D O I：
10.1016/j.jallcom.2020.158392
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：
Perovskite manganite (1-x)La0.6Ca0.4MnO3/xMn(2)O(3) (x = 0, 0.05. 0.1, 0.15, 0.20) composites were prepared by solid state reaction method. X-ray diffraction measurements were used to confirm the crystal structure and the average crystallite size of the samples. Their magnetic, magnetocaloric and heat capacity properties display a presence of second order magnetic phase transition at 260 K. The maximum magnetic entropy change was found to be 5.33 J/kgK for x = 0.1 of Mn2O3 under 5 T. The relative cooling power (RCP) was found (235 J/kg) to largely exceed that reported in early works for a similar family of materials. In addition, the RCP of the mother alloy is enhanced by more than 20% under 32 kOe without affecting the Curie temperature that remains approximately constant close to 260 K. Our results suggest that the addition of Mn2O3 could be useful for the enhancement of the LCMO refrigerant capacity without affecting the Curie temperature. (C) 2020 Elsevier B.V. All rights reserved.
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页数：9
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