Magnetocaloric Effect in La(Fe,Mn,Si)13Hx Based Composites: Experiment and Theory

被引：4

作者：

Kamantsev, A. P. ^{[1
]}

Amirov, A. A. ^{[2
]}

Yusupov, D. M. ^{[2
]}

Golovchan, A. V. ^{[1
,3
]}

Kovalev, O. E. ^{[1
,3
]}

Komlev, A. S. ^{[4
]}

Aliev, A. M. ^{[2
]}

机构：

[1] Russian Acad Sci, Kotelnikov Inst Radioengn & Elect, Moscow 125009, Russia

[2] Russian Acad Sci, Amirkhanov Inst Phys, Dagestan Fed Res Ctr, Makhachkala 367003, Republic Dagest, Russia

[3] Galkin Donetsk Inst Phys & Technol, Doneck 283048, Russia

[4] Lomonosov Moscow State Univ, Moscow 119991, Russia

来源：

PHYSICS OF METALS AND METALLOGRAPHY | 2023年 / 124卷 / 11期

基金：

俄罗斯科学基金会;

关键词：

magnetocaloric effect; high magnetic fields; exchange interaction; TRANSITION; ENERGY;

D O I：

10.1134/S0031918X23601695

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Samples of composites with different porosity and surface roughness based on LaFe11.4Mn0.3Si1.3H1.6 (LFMSH) alloy powders were obtained, their magnetocaloric properties were studied by the direct method in cyclic magnetic fields of mu H-0 = 1.2 T with a frequency of 2 Hz. The maximal value of the adiabatic temperature change in pure LFMSH powder was Delta T = 3 K at T-0 = 287 K in the sample cooling regime, and for composite samples, this value was approximately two times lower than that in the powder. The effect of Mn and H atoms on the electronic structure and local magnetic characteristics of the initial La(Fe,Si)(13) alloy was studied using electron density functional theory. Replacement of some Fe atoms with Mn reduces the total magnetic moment and somewhat lowers the Curie temperature. In contrast, hydrogenation leads to an increase in exchange interactions between Fe atoms located at the vertices of the icosahedron and an increase in the Curie temperature.

引用

页码：1121 / 1131

页数：11

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