Magnetocaloric properties, magnetic interactions and critical behavior in Ho6(Fe,Mn)Bi2 intermetallics

被引：17

作者：

Herrero, A. ^{[1
]}

Oleaga, A. ^{[1
]}

Salazar, A. ^{[1
]}

Garshev, A. V. ^{[2
]}

Yapaskurt, V. O. ^{[3
]}

Morozkin, A. V. ^{[2
]}

机构：

[1] Univ Pais Vasco UPV EHU, Dept Fis Aplicada 1, Escuela Ingn Bilbao, Plaza Torres Quevedo 1, Bilbao 48013, Spain

[2] Moscow MV Lomonosov State Univ, Dept Chem, House 1,Bldg 3,GSP-2, Moscow 119991, Russia

[3] Moscow MV Lomonosov State Univ, Dept Petrol, Geol Fac, Moscow 119991, Russia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 821卷

关键词：

Magnetocaloric effect; Rare earth compound; Magnetic properties; Spin-ordering; Critical behavior; ENTROPY CHANGE; COMPOUNDS R; MN; FE; SB; CO; REFRIGERATION; GD6FEBI2; HO; DY;

D O I：

10.1016/j.jallcom.2019.153198

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：

Four polycrystaline Fe2P-type Ho-6(Fe,Mn)Bi-2 intermetallic compounds (space group P (6) over bar 2m, No. 189, hP9) have been studied using magnetic techniques in order to explore their ability as magnetocaloric materials, and study the critical behavior of the paramagnetic (PM) to ferromagnetic (FM) transitions to obtain a deeper understanding of the range of the magnetic interactions. The obtained critical exponents beta, gamma and delta for the four compounds studied (Ho6MnBi2, Ho6FeBi2, Ho-6(Mn0.5Fe0.6)Bi-2, Ho-6(Mn0.25Fe0.25)Bi-2) point to long-range order interactions, as they are close to those of the Mean Field Universality class. All of the compounds show relevant magnetocaloric properties over a very broad temperature range, limited by the PM-FM transition and a spin-reorientation one, well separated in all cases. They present very high values of the refrigerant capacities (from 520 J/kg to 709 J/kg at 5 T), good magnetic entropy changes (from 3.4 to 5.7 J/(kgK) at 5 T), and a flat and wide temperature span for the working temperature range (nearly 200 K for Ho6MnBi2, 80 K for Ho6FeBi2 at 5T). The change in properties with composition proves that the magnetocaloric properties can be tuned in Fe2P-type compounds to accommodate different refrigeration applications. Finally, the magnetocaloric scaling laws have been successfully tested and universal curves for the magnetic entropy change have also been obtained in the PM-FM transition region. (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：12

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