Giant magnetic entropy change in hydrogenated La(Fe0.88Si0.12)13Hy compounds

Asaya Fujita; Shun Fujieda; Kazuaki Fukamichi; Yoshihiro Yamazaki; Yoshiaki Iijima

doi:10.2320/matertrans.43.1202

Giant magnetic entropy change in hydrogenated La(Fe_0.88Si_0.12)₁₃H_y compounds

Asaya Fujita, Shun Fujieda, Kazuaki Fukamichi, Yoshihiro Yamazaki, Yoshiaki Iijima

Division of Inorganic Material Research

Research output: Contribution to journal › Article › peer-review

56 Citations (Scopus)

Abstract

A magnetic entropy change ΔS_M due to the itinerant-electron metamagnetic (IEM) transition was estimated to be -23 J/kg K around the Curie temperature for La(Fe_0.88Si_0.12)₁₃ in the magnetic field change from 0 to 5 T. In order to control the Curie temperature while keeping such a large value of ΔS_M, hydrogen absorption was carried out. La(Fe_0.88Si_0.12)₁₃H_1.0 with T_C = 274 K shows a large ΔS_M due to the IEM transition around room temperature. The adiabatic temperature change ΔT_ad from 0 to 2 T is about 7 K, comparable to that of Gd₅(Ge_0.5Si_0.5)₄. By changing the hydrogen concentration, the Curie temperature can be controlled from 195 to 336 K. It should be noted that the magnitude of ΔS_M is almost the same after hydrogen absorption. Therefore, the hydrogenated La(Fe_0.88Si_0.12)₁₃H_y compounds are promising magnetic refrigerants working in a wide range of temperature.

Original language	English
Pages (from-to)	1202-1204
Number of pages	3
Journal	Materials Transactions
Volume	43
Issue number	5
DOIs	https://doi.org/10.2320/matertrans.43.1202
Publication status	Published - 2002 May

Keywords

Adiabatic temperature change
Hydrogen absorption
Itinerant-electron metamagnetism
Magnetic entropy change
Magnetic refrigerant

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.2320/matertrans.43.1202

Cite this

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title = "Giant magnetic entropy change in hydrogenated La(Fe0.88Si0.12)13Hy compounds",

abstract = "A magnetic entropy change ΔSM due to the itinerant-electron metamagnetic (IEM) transition was estimated to be -23 J/kg K around the Curie temperature for La(Fe0.88Si0.12)13 in the magnetic field change from 0 to 5 T. In order to control the Curie temperature while keeping such a large value of ΔSM, hydrogen absorption was carried out. La(Fe0.88Si0.12)13H1.0 with TC = 274 K shows a large ΔSM due to the IEM transition around room temperature. The adiabatic temperature change ΔTad from 0 to 2 T is about 7 K, comparable to that of Gd5(Ge0.5Si0.5)4. By changing the hydrogen concentration, the Curie temperature can be controlled from 195 to 336 K. It should be noted that the magnitude of ΔSM is almost the same after hydrogen absorption. Therefore, the hydrogenated La(Fe0.88Si0.12)13Hy compounds are promising magnetic refrigerants working in a wide range of temperature.",

keywords = "Adiabatic temperature change, Hydrogen absorption, Itinerant-electron metamagnetism, Magnetic entropy change, Magnetic refrigerant",

author = "Asaya Fujita and Shun Fujieda and Kazuaki Fukamichi and Yoshihiro Yamazaki and Yoshiaki Iijima",

year = "2002",

month = may,

doi = "10.2320/matertrans.43.1202",

language = "English",

volume = "43",

pages = "1202--1204",

journal = "Materials Transactions",

issn = "1345-9678",

publisher = "Japan Institute of Metals (JIM)",

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T1 - Giant magnetic entropy change in hydrogenated La(Fe0.88Si0.12)13Hy compounds

AU - Fujita, Asaya

AU - Fujieda, Shun

AU - Fukamichi, Kazuaki

AU - Yamazaki, Yoshihiro

AU - Iijima, Yoshiaki

PY - 2002/5

Y1 - 2002/5

N2 - A magnetic entropy change ΔSM due to the itinerant-electron metamagnetic (IEM) transition was estimated to be -23 J/kg K around the Curie temperature for La(Fe0.88Si0.12)13 in the magnetic field change from 0 to 5 T. In order to control the Curie temperature while keeping such a large value of ΔSM, hydrogen absorption was carried out. La(Fe0.88Si0.12)13H1.0 with TC = 274 K shows a large ΔSM due to the IEM transition around room temperature. The adiabatic temperature change ΔTad from 0 to 2 T is about 7 K, comparable to that of Gd5(Ge0.5Si0.5)4. By changing the hydrogen concentration, the Curie temperature can be controlled from 195 to 336 K. It should be noted that the magnitude of ΔSM is almost the same after hydrogen absorption. Therefore, the hydrogenated La(Fe0.88Si0.12)13Hy compounds are promising magnetic refrigerants working in a wide range of temperature.

AB - A magnetic entropy change ΔSM due to the itinerant-electron metamagnetic (IEM) transition was estimated to be -23 J/kg K around the Curie temperature for La(Fe0.88Si0.12)13 in the magnetic field change from 0 to 5 T. In order to control the Curie temperature while keeping such a large value of ΔSM, hydrogen absorption was carried out. La(Fe0.88Si0.12)13H1.0 with TC = 274 K shows a large ΔSM due to the IEM transition around room temperature. The adiabatic temperature change ΔTad from 0 to 2 T is about 7 K, comparable to that of Gd5(Ge0.5Si0.5)4. By changing the hydrogen concentration, the Curie temperature can be controlled from 195 to 336 K. It should be noted that the magnitude of ΔSM is almost the same after hydrogen absorption. Therefore, the hydrogenated La(Fe0.88Si0.12)13Hy compounds are promising magnetic refrigerants working in a wide range of temperature.

KW - Adiabatic temperature change

KW - Hydrogen absorption

KW - Itinerant-electron metamagnetism

KW - Magnetic entropy change

KW - Magnetic refrigerant

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