Tunable Curie temperatures in Gd alloyed Fe-B-Cr magnetocaloric materials

J. Y. Law; R. V. Ramanujan; V. Franco

doi:10.1016/j.jallcom.2010.08.049

Tunable Curie temperatures in Gd alloyed Fe-B-Cr magnetocaloric materials

J. Y. Law, R. V. Ramanujan^*, V. Franco

^*Corresponding author for this work

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

107 Citations (Scopus)

Abstract

The magnetocaloric effect of Fe_80-xB₁₂Cr ₈Gd_x (x = 1, 2, 3, 5, 8, 10, 11) amorphous alloys was studied. Gd addition increases the thermal stability of the alloy and allows tuning the Curie temperature (T_C). A linear relationship between the magnetic entropy change and the magnetic moment of the alloy was observed. The experimental values of magnetic field dependence of the magnetic entropy change were consistent with a phenomenological universal curve. The maximum magnetic entropy change, for x = 1, was ∼33% larger than Fe₈₀B ₁₂Cr₈, the refrigerant capacity (RC) is ∼29% larger than Gd₅Si₂Ge_1.9Fe_0.1 and within 10% of Fe_82.5Zr₇B₄Co_2.75Ni _2.75Cu₁ which is the best Fe-based amorphous MCM to date. The tunable T_C can be used to increase RC and the temperature span of layered multi-composition magnetocaloric regenerators.

Original language	English
Pages (from-to)	14-19
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	508
Issue number	1
DOIs	https://doi.org/10.1016/j.jallcom.2010.08.049
Publication status	Published - Oct 15 2010
Externally published	Yes

ASJC Scopus Subject Areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Keywords

Amorphous materials
Magnetic measurements
Magnetocaloric
Quenching
Rapid-solidification
Rare earth alloys and compounds

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10.1016/j.jallcom.2010.08.049

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title = "Tunable Curie temperatures in Gd alloyed Fe-B-Cr magnetocaloric materials",

abstract = "The magnetocaloric effect of Fe80-xB12Cr 8Gdx (x = 1, 2, 3, 5, 8, 10, 11) amorphous alloys was studied. Gd addition increases the thermal stability of the alloy and allows tuning the Curie temperature (TC). A linear relationship between the magnetic entropy change and the magnetic moment of the alloy was observed. The experimental values of magnetic field dependence of the magnetic entropy change were consistent with a phenomenological universal curve. The maximum magnetic entropy change, for x = 1, was ∼33\% larger than Fe80B 12Cr8, the refrigerant capacity (RC) is ∼29\% larger than Gd5Si2Ge1.9Fe0.1 and within 10\% of Fe82.5Zr7B4Co2.75Ni 2.75Cu1 which is the best Fe-based amorphous MCM to date. The tunable TC can be used to increase RC and the temperature span of layered multi-composition magnetocaloric regenerators.",

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author = "Law, \{J. Y.\} and Ramanujan, \{R. V.\} and V. Franco",

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AU - Law, J. Y.

AU - Ramanujan, R. V.

AU - Franco, V.

PY - 2010/10/15

Y1 - 2010/10/15

N2 - The magnetocaloric effect of Fe80-xB12Cr 8Gdx (x = 1, 2, 3, 5, 8, 10, 11) amorphous alloys was studied. Gd addition increases the thermal stability of the alloy and allows tuning the Curie temperature (TC). A linear relationship between the magnetic entropy change and the magnetic moment of the alloy was observed. The experimental values of magnetic field dependence of the magnetic entropy change were consistent with a phenomenological universal curve. The maximum magnetic entropy change, for x = 1, was ∼33% larger than Fe80B 12Cr8, the refrigerant capacity (RC) is ∼29% larger than Gd5Si2Ge1.9Fe0.1 and within 10% of Fe82.5Zr7B4Co2.75Ni 2.75Cu1 which is the best Fe-based amorphous MCM to date. The tunable TC can be used to increase RC and the temperature span of layered multi-composition magnetocaloric regenerators.

AB - The magnetocaloric effect of Fe80-xB12Cr 8Gdx (x = 1, 2, 3, 5, 8, 10, 11) amorphous alloys was studied. Gd addition increases the thermal stability of the alloy and allows tuning the Curie temperature (TC). A linear relationship between the magnetic entropy change and the magnetic moment of the alloy was observed. The experimental values of magnetic field dependence of the magnetic entropy change were consistent with a phenomenological universal curve. The maximum magnetic entropy change, for x = 1, was ∼33% larger than Fe80B 12Cr8, the refrigerant capacity (RC) is ∼29% larger than Gd5Si2Ge1.9Fe0.1 and within 10% of Fe82.5Zr7B4Co2.75Ni 2.75Cu1 which is the best Fe-based amorphous MCM to date. The tunable TC can be used to increase RC and the temperature span of layered multi-composition magnetocaloric regenerators.

KW - Amorphous materials

KW - Magnetic measurements

KW - Magnetocaloric

KW - Quenching

KW - Rapid-solidification

KW - Rare earth alloys and compounds

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Tunable Curie temperatures in Gd alloyed Fe-B-Cr magnetocaloric materials

Abstract

ASJC Scopus Subject Areas

Keywords

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