Magnetic entropy change and its temperature variation in compounds La(Fe 1-xCo x) 11.2Si 1.8

F. X. Hu; X. L. Qian; J. R. Sun; G. J. Wang; X. X. Zhang; Z. H. Cheng; B. G. Shen

doi:10.1063/1.1502919

Magnetic entropy change and its temperature variation in compounds La(Fe _1-xCo _x) _11.2Si _1.8

F. X. Hu^*, X. L. Qian, J. R. Sun, G. J. Wang, X. X. Zhang, Z. H. Cheng, B. G. Shen

^*Corresponding author for this work

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

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Abstract

Magnetic entropy change ΔS of compounds La(Fe _1-xCo _x) _11.2Si _1.8 with the cubic NaZn ₁₃-type structure was investigated around their Curie temperature T _C. It is found that the phase transition is completely reversible, indicating a nature of second order phase transition. The maximum value of ΔS∼13.0 J/kgK under a field of 5 T was achieved in compound LaFe _11.2Si _1.8 at its T _C of ∼222 K, which exceeds that of most materials involving a second order transition at the corresponding temperature. With increasing substitution of Co for Fe from x=0 to x=0.8, T _C shifts from 222 to 307 K and entropy change decreases. However, ΔS still has a considerable magnitude near room temperature. The large magnetic entropy change is believed to be due to the abrupt change of magnetization at T _C, which is associated with the strong structural and magnetic interplay in the compounds.

Original language	English (US)
Pages (from-to)	3620-3623
Number of pages	4
Journal	Journal of Applied Physics
Volume	92
Issue number	7
DOIs	https://doi.org/10.1063/1.1502919
State	Published - Oct 1 2002
Externally published	Yes

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General Physics and Astronomy

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title = "Magnetic entropy change and its temperature variation in compounds La(Fe 1-xCo x) 11.2Si 1.8 ",

abstract = "Magnetic entropy change ΔS of compounds La(Fe 1-xCo x) 11.2Si 1.8 with the cubic NaZn 13-type structure was investigated around their Curie temperature T C. It is found that the phase transition is completely reversible, indicating a nature of second order phase transition. The maximum value of ΔS∼13.0 J/kgK under a field of 5 T was achieved in compound LaFe 11.2Si 1.8 at its T C of ∼222 K, which exceeds that of most materials involving a second order transition at the corresponding temperature. With increasing substitution of Co for Fe from x=0 to x=0.8, T C shifts from 222 to 307 K and entropy change decreases. However, ΔS still has a considerable magnitude near room temperature. The large magnetic entropy change is believed to be due to the abrupt change of magnetization at T C, which is associated with the strong structural and magnetic interplay in the compounds.",

author = "Hu, {F. X.} and Qian, {X. L.} and Sun, {J. R.} and Wang, {G. J.} and Zhang, {X. X.} and Cheng, {Z. H.} and Shen, {B. G.}",

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T1 - Magnetic entropy change and its temperature variation in compounds La(Fe 1-xCo x) 11.2Si 1.8

AU - Hu, F. X.

AU - Qian, X. L.

AU - Sun, J. R.

AU - Wang, G. J.

AU - Zhang, X. X.

AU - Cheng, Z. H.

AU - Shen, B. G.

PY - 2002/10/1

Y1 - 2002/10/1

N2 - Magnetic entropy change ΔS of compounds La(Fe 1-xCo x) 11.2Si 1.8 with the cubic NaZn 13-type structure was investigated around their Curie temperature T C. It is found that the phase transition is completely reversible, indicating a nature of second order phase transition. The maximum value of ΔS∼13.0 J/kgK under a field of 5 T was achieved in compound LaFe 11.2Si 1.8 at its T C of ∼222 K, which exceeds that of most materials involving a second order transition at the corresponding temperature. With increasing substitution of Co for Fe from x=0 to x=0.8, T C shifts from 222 to 307 K and entropy change decreases. However, ΔS still has a considerable magnitude near room temperature. The large magnetic entropy change is believed to be due to the abrupt change of magnetization at T C, which is associated with the strong structural and magnetic interplay in the compounds.

AB - Magnetic entropy change ΔS of compounds La(Fe 1-xCo x) 11.2Si 1.8 with the cubic NaZn 13-type structure was investigated around their Curie temperature T C. It is found that the phase transition is completely reversible, indicating a nature of second order phase transition. The maximum value of ΔS∼13.0 J/kgK under a field of 5 T was achieved in compound LaFe 11.2Si 1.8 at its T C of ∼222 K, which exceeds that of most materials involving a second order transition at the corresponding temperature. With increasing substitution of Co for Fe from x=0 to x=0.8, T C shifts from 222 to 307 K and entropy change decreases. However, ΔS still has a considerable magnitude near room temperature. The large magnetic entropy change is believed to be due to the abrupt change of magnetization at T C, which is associated with the strong structural and magnetic interplay in the compounds.

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JO - Journal of Applied Physics

JF - Journal of Applied Physics

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Magnetic entropy change and its temperature variation in compounds La(Fe _1-xCo _x) _11.2Si _1.8

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