Magnetocaloric effect in MnNiSi-Fe2Ge and MnNiSi-Fe-Sn alloys

D. Kambie; R. V. Ramanujan

doi:10.1109/INTMAG.2018.8508673

Magnetocaloric effect in MnNiSi-Fe₂Ge and MnNiSi-Fe-Sn alloys

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The near room temperature magnetocaloric effect (MCE) of MnNiSi based alloys is of current interest in magnetocaloric cooling applications [1]. MnNiSi is a ferromagnetic alloy with a Curie temperature (Tc) of 620 K [2]' it exhibits a structural transition from orthorhombic to hexagonal above 1200 K [3]. Single element substitution has been found to be unable to decrease T_c to near room temperature therefore 2 element substitution is necessary to obtain magnetostructural coupling near room temperature [4] [5]. A magnetostructural transition near room temperature is observed in (MnNiSi)₁ - _x(Fe₂Ge)_x (x = 0.32 to 0.36) and Mn₀ 4 ₅Fe_a 5 ₅NiSi₁ - _ySn_y (y = 0.12 to 0.18) alloys. A high temperature paramagnetic hexagonal phase which is converted to a low temperature ferromagnetic orthorhombic phase. Fe₂Ge stabilizes the hexagonal phase of MnNiSi to create a Curie temperature window (CTW) near the room temperature. In Mn₀ 4 ₅Fe₀ 5 ₅NiSi it has been observed that the T_c could only be decreased to 438K. The Sn composition was varied from 0.12 to 0.18 to further reduce T_c to near room temperature values. Sn also reduces the cost of the material.

Original language	English
Title of host publication	2018 IEEE International Magnetic Conference, INTERMAG 2018
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781538664254
DOIs	https://doi.org/10.1109/INTMAG.2018.8508673
Publication status	Published - Oct 24 2018
Externally published	Yes
Event	2018 IEEE International Magnetic Conference, INTERMAG 2018 - Singapore, Singapore Duration: Apr 23 2018 → Apr 27 2018

Publication series

Name	2018 IEEE International Magnetic Conference, INTERMAG 2018

Conference

Conference	2018 IEEE International Magnetic Conference, INTERMAG 2018
Country/Territory	Singapore
City	Singapore
Period	4/23/18 → 4/27/18

Bibliographical note

Publisher Copyright:
© 2018 IEEE.

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Instrumentation

Access to Document

10.1109/INTMAG.2018.8508673

Cite this

@inproceedings{43c2487e988849dfae16492762d97cee,

title = "Magnetocaloric effect in MnNiSi-Fe2Ge and MnNiSi-Fe-Sn alloys",

abstract = "The near room temperature magnetocaloric effect (MCE) of MnNiSi based alloys is of current interest in magnetocaloric cooling applications [1]. MnNiSi is a ferromagnetic alloy with a Curie temperature (Tc) of 620 K [2]' it exhibits a structural transition from orthorhombic to hexagonal above 1200 K [3]. Single element substitution has been found to be unable to decrease Tc to near room temperature therefore 2 element substitution is necessary to obtain magnetostructural coupling near room temperature [4] [5]. A magnetostructural transition near room temperature is observed in (MnNiSi)1 - x(Fe2Ge)x (x = 0.32 to 0.36) and Mn0 4 5Fea 5 5NiSi1 - ySny (y = 0.12 to 0.18) alloys. A high temperature paramagnetic hexagonal phase which is converted to a low temperature ferromagnetic orthorhombic phase. Fe2Ge stabilizes the hexagonal phase of MnNiSi to create a Curie temperature window (CTW) near the room temperature. In Mn0 4 5Fe0 5 5NiSi it has been observed that the Tc could only be decreased to 438K. The Sn composition was varied from 0.12 to 0.18 to further reduce Tc to near room temperature values. Sn also reduces the cost of the material.",

author = "D. Kambie and Ramanujan, {R. V.}",

note = "Publisher Copyright: {\textcopyright} 2018 IEEE.; 2018 IEEE International Magnetic Conference, INTERMAG 2018 ; Conference date: 23-04-2018 Through 27-04-2018",

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doi = "10.1109/INTMAG.2018.8508673",

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Kambie, D & Ramanujan, RV 2018, Magnetocaloric effect in MnNiSi-Fe₂Ge and MnNiSi-Fe-Sn alloys. in 2018 IEEE International Magnetic Conference, INTERMAG 2018., 8508673, 2018 IEEE International Magnetic Conference, INTERMAG 2018, Institute of Electrical and Electronics Engineers Inc., 2018 IEEE International Magnetic Conference, INTERMAG 2018, Singapore, Singapore, 4/23/18. https://doi.org/10.1109/INTMAG.2018.8508673

Magnetocaloric effect in MnNiSi-Fe₂Ge and MnNiSi-Fe-Sn alloys. / Kambie, D.; Ramanujan, R. V.
2018 IEEE International Magnetic Conference, INTERMAG 2018. Institute of Electrical and Electronics Engineers Inc., 2018. 8508673 (2018 IEEE International Magnetic Conference, INTERMAG 2018).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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N2 - The near room temperature magnetocaloric effect (MCE) of MnNiSi based alloys is of current interest in magnetocaloric cooling applications [1]. MnNiSi is a ferromagnetic alloy with a Curie temperature (Tc) of 620 K [2]' it exhibits a structural transition from orthorhombic to hexagonal above 1200 K [3]. Single element substitution has been found to be unable to decrease Tc to near room temperature therefore 2 element substitution is necessary to obtain magnetostructural coupling near room temperature [4] [5]. A magnetostructural transition near room temperature is observed in (MnNiSi)1 - x(Fe2Ge)x (x = 0.32 to 0.36) and Mn0 4 5Fea 5 5NiSi1 - ySny (y = 0.12 to 0.18) alloys. A high temperature paramagnetic hexagonal phase which is converted to a low temperature ferromagnetic orthorhombic phase. Fe2Ge stabilizes the hexagonal phase of MnNiSi to create a Curie temperature window (CTW) near the room temperature. In Mn0 4 5Fe0 5 5NiSi it has been observed that the Tc could only be decreased to 438K. The Sn composition was varied from 0.12 to 0.18 to further reduce Tc to near room temperature values. Sn also reduces the cost of the material.

AB - The near room temperature magnetocaloric effect (MCE) of MnNiSi based alloys is of current interest in magnetocaloric cooling applications [1]. MnNiSi is a ferromagnetic alloy with a Curie temperature (Tc) of 620 K [2]' it exhibits a structural transition from orthorhombic to hexagonal above 1200 K [3]. Single element substitution has been found to be unable to decrease Tc to near room temperature therefore 2 element substitution is necessary to obtain magnetostructural coupling near room temperature [4] [5]. A magnetostructural transition near room temperature is observed in (MnNiSi)1 - x(Fe2Ge)x (x = 0.32 to 0.36) and Mn0 4 5Fea 5 5NiSi1 - ySny (y = 0.12 to 0.18) alloys. A high temperature paramagnetic hexagonal phase which is converted to a low temperature ferromagnetic orthorhombic phase. Fe2Ge stabilizes the hexagonal phase of MnNiSi to create a Curie temperature window (CTW) near the room temperature. In Mn0 4 5Fe0 5 5NiSi it has been observed that the Tc could only be decreased to 438K. The Sn composition was varied from 0.12 to 0.18 to further reduce Tc to near room temperature values. Sn also reduces the cost of the material.

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