Optimization of Ni-Co-Mn-Sn Heusler alloy composition for near room temperature magnetic cooling

X. Chen; V. B. Naik; R. Mahendiran; R. V. Ramanujan

doi:10.1016/j.jallcom.2014.08.032

Optimization of Ni-Co-Mn-Sn Heusler alloy composition for near room temperature magnetic cooling

X. Chen, V. B. Naik, R. Mahendiran, R. V. Ramanujan^*

^*Corresponding author for this work

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

42 Citations (Scopus)

Abstract

Ni-Co-Mn-Sn based Heusler alloys are promising magnetocaloric materials. The effect of both Co and Mn substitution in these alloys was studied. The magnetocaloric properties, thermopower, electrical resistivity, structural and magnetic phase transitions of Ni-Co-Mn-Sn alloys were determined. Interestingly, tuning Co and Mn composition resulted in high maximum entropy change (ΔS_max) of ∼32 J/kg K near room temperature in Ni₄₈Co₂Mn₃₈Sn₁₂alloys. Alloying additions of cobalt increased magnetization and decreased the martensitic transition temperature (M_s). The Curie temperature of the austenite (T_c^A) and martensite (T_c^M) phases increased with increasing Co content. However, this decrease of M_sand increase of T_c^Mresulted in decrease of the change in magnetization during the martensitic transition. Hence, Mn content was tuned to increase ΔS_Mand to tune M_sto a value relevant to room temperature applications. Thus, through tuning both Co and Mn composition, a high ΔS_Mwas obtained near room temperature, making these alloys attractive magnetocaloric materials for room temperature applications.

Original language	English
Pages (from-to)	187-191
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	618
DOIs	https://doi.org/10.1016/j.jallcom.2014.08.032
Publication status	Published - Jan 5 2015
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2014 Elsevier B.V. All rights reserved.

ASJC Scopus Subject Areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Keywords

Heusler alloys
Magnetocaloric materials
Martensitic transition

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10.1016/j.jallcom.2014.08.032

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title = "Optimization of Ni-Co-Mn-Sn Heusler alloy composition for near room temperature magnetic cooling",

abstract = "Ni-Co-Mn-Sn based Heusler alloys are promising magnetocaloric materials. The effect of both Co and Mn substitution in these alloys was studied. The magnetocaloric properties, thermopower, electrical resistivity, structural and magnetic phase transitions of Ni-Co-Mn-Sn alloys were determined. Interestingly, tuning Co and Mn composition resulted in high maximum entropy change (ΔSmax) of ∼32 J/kg K near room temperature in Ni48Co2Mn38Sn12alloys. Alloying additions of cobalt increased magnetization and decreased the martensitic transition temperature (Ms). The Curie temperature of the austenite (TcA) and martensite (TcM) phases increased with increasing Co content. However, this decrease of Msand increase of TcMresulted in decrease of the change in magnetization during the martensitic transition. Hence, Mn content was tuned to increase ΔSMand to tune Msto a value relevant to room temperature applications. Thus, through tuning both Co and Mn composition, a high ΔSMwas obtained near room temperature, making these alloys attractive magnetocaloric materials for room temperature applications.",

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AU - Chen, X.

AU - Naik, V. B.

AU - Mahendiran, R.

AU - Ramanujan, R. V.

PY - 2015/1/5

Y1 - 2015/1/5

N2 - Ni-Co-Mn-Sn based Heusler alloys are promising magnetocaloric materials. The effect of both Co and Mn substitution in these alloys was studied. The magnetocaloric properties, thermopower, electrical resistivity, structural and magnetic phase transitions of Ni-Co-Mn-Sn alloys were determined. Interestingly, tuning Co and Mn composition resulted in high maximum entropy change (ΔSmax) of ∼32 J/kg K near room temperature in Ni48Co2Mn38Sn12alloys. Alloying additions of cobalt increased magnetization and decreased the martensitic transition temperature (Ms). The Curie temperature of the austenite (TcA) and martensite (TcM) phases increased with increasing Co content. However, this decrease of Msand increase of TcMresulted in decrease of the change in magnetization during the martensitic transition. Hence, Mn content was tuned to increase ΔSMand to tune Msto a value relevant to room temperature applications. Thus, through tuning both Co and Mn composition, a high ΔSMwas obtained near room temperature, making these alloys attractive magnetocaloric materials for room temperature applications.

AB - Ni-Co-Mn-Sn based Heusler alloys are promising magnetocaloric materials. The effect of both Co and Mn substitution in these alloys was studied. The magnetocaloric properties, thermopower, electrical resistivity, structural and magnetic phase transitions of Ni-Co-Mn-Sn alloys were determined. Interestingly, tuning Co and Mn composition resulted in high maximum entropy change (ΔSmax) of ∼32 J/kg K near room temperature in Ni48Co2Mn38Sn12alloys. Alloying additions of cobalt increased magnetization and decreased the martensitic transition temperature (Ms). The Curie temperature of the austenite (TcA) and martensite (TcM) phases increased with increasing Co content. However, this decrease of Msand increase of TcMresulted in decrease of the change in magnetization during the martensitic transition. Hence, Mn content was tuned to increase ΔSMand to tune Msto a value relevant to room temperature applications. Thus, through tuning both Co and Mn composition, a high ΔSMwas obtained near room temperature, making these alloys attractive magnetocaloric materials for room temperature applications.

KW - Heusler alloys

KW - Magnetocaloric materials

KW - Martensitic transition

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Optimization of Ni-Co-Mn-Sn Heusler alloy composition for near room temperature magnetic cooling

Abstract

Bibliographical note

ASJC Scopus Subject Areas

Keywords

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