Magnetocaloric effect in spherical la (Fex Si1-x) 13 and their hydrides for active magnetic regenerator-type refrigerator

A. Fujita; S. Koiwai; S. Fujieda; K. Fukamichi; T. Kobayashi; H. Tsuji; S. Kaji; A. T. Saito

doi:10.1063/1.3070658

Magnetocaloric effect in spherical la (Fex Si1-x) 13 and their hydrides for active magnetic regenerator-type refrigerator

A. Fujita, S. Koiwai, S. Fujieda, K. Fukamichi, T. Kobayashi, H. Tsuji, S. Kaji, A. T. Saito

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

33 Citations (Scopus)

Abstract

We have fabricated spherical La (Fex Si1-x) 13 compounds by a rotating electrode process (REP) to provide suitable refrigerants for active magnetic regenerator (AMR)-type systems. In the as-prepared state, the cross section exhibits a dendritic metallographic structure composed of two phases of α-Fe -based alloy with Si and LaFeSi equiatomic compound. After annealing at 1323 K for 5 days, the spheres become a single phase of La (Fex Si1-x) 13. From the temperature dependence of magnetic entropy change for the hydrogenated spheres, it has been confirmed that the hydrogen concentration in the spheres is homogeneous. In addition, it has also been demonstrated that the itinerant-electron metamagnetic transition appears in the spheres with the higher Fe concentration. Consequently, the spherical La (Fex Si1-x) 13 fabricated by the REP are suitable for AMR-type refrigerations.

Original language	English
Article number	07A936
Journal	Journal of Applied Physics
Volume	105
Issue number	7
DOIs	https://doi.org/10.1063/1.3070658
Publication status	Published - 2009
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.3070658

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title = "Magnetocaloric effect in spherical la (Fex Si1-x) 13 and their hydrides for active magnetic regenerator-type refrigerator",

abstract = "We have fabricated spherical La (Fex Si1-x) 13 compounds by a rotating electrode process (REP) to provide suitable refrigerants for active magnetic regenerator (AMR)-type systems. In the as-prepared state, the cross section exhibits a dendritic metallographic structure composed of two phases of α-Fe -based alloy with Si and LaFeSi equiatomic compound. After annealing at 1323 K for 5 days, the spheres become a single phase of La (Fex Si1-x) 13. From the temperature dependence of magnetic entropy change for the hydrogenated spheres, it has been confirmed that the hydrogen concentration in the spheres is homogeneous. In addition, it has also been demonstrated that the itinerant-electron metamagnetic transition appears in the spheres with the higher Fe concentration. Consequently, the spherical La (Fex Si1-x) 13 fabricated by the REP are suitable for AMR-type refrigerations.",

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T1 - Magnetocaloric effect in spherical la (Fex Si1-x) 13 and their hydrides for active magnetic regenerator-type refrigerator

AU - Fujita, A.

AU - Koiwai, S.

AU - Fujieda, S.

AU - Fukamichi, K.

AU - Kobayashi, T.

AU - Tsuji, H.

AU - Kaji, S.

AU - Saito, A. T.

PY - 2009

Y1 - 2009

N2 - We have fabricated spherical La (Fex Si1-x) 13 compounds by a rotating electrode process (REP) to provide suitable refrigerants for active magnetic regenerator (AMR)-type systems. In the as-prepared state, the cross section exhibits a dendritic metallographic structure composed of two phases of α-Fe -based alloy with Si and LaFeSi equiatomic compound. After annealing at 1323 K for 5 days, the spheres become a single phase of La (Fex Si1-x) 13. From the temperature dependence of magnetic entropy change for the hydrogenated spheres, it has been confirmed that the hydrogen concentration in the spheres is homogeneous. In addition, it has also been demonstrated that the itinerant-electron metamagnetic transition appears in the spheres with the higher Fe concentration. Consequently, the spherical La (Fex Si1-x) 13 fabricated by the REP are suitable for AMR-type refrigerations.

AB - We have fabricated spherical La (Fex Si1-x) 13 compounds by a rotating electrode process (REP) to provide suitable refrigerants for active magnetic regenerator (AMR)-type systems. In the as-prepared state, the cross section exhibits a dendritic metallographic structure composed of two phases of α-Fe -based alloy with Si and LaFeSi equiatomic compound. After annealing at 1323 K for 5 days, the spheres become a single phase of La (Fex Si1-x) 13. From the temperature dependence of magnetic entropy change for the hydrogenated spheres, it has been confirmed that the hydrogen concentration in the spheres is homogeneous. In addition, it has also been demonstrated that the itinerant-electron metamagnetic transition appears in the spheres with the higher Fe concentration. Consequently, the spherical La (Fex Si1-x) 13 fabricated by the REP are suitable for AMR-type refrigerations.

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Magnetocaloric effect in spherical la (Fex Si1-x) 13 and their hydrides for active magnetic regenerator-type refrigerator

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