Structural origin of hysteresis for hexagonal (Mn,Fe)2(P,Si) magneto-caloric compound

Xue Fei Miao; Hossein Sepehri-Amin; Kazuhiro Hono

doi:10.1016/j.scriptamat.2017.05.043

Structural origin of hysteresis for hexagonal (Mn,Fe)₂(P,Si) magneto-caloric compound

Xue Fei Miao, Hossein Sepehri-Amin, Kazuhiro Hono

International Center for Synchrotron Radiation Innovation Smart (SRIS)

National Institute for Materials Science Tsukuba

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

15 Citations (Scopus)

Abstract

We performed in-situ transmission electron microscope observations on the unconventional ferromagnetic transition in hexagonal (Mn,Fe)₂(P,Si) magneto-caloric compounds in order to understand the origin of the large thermal hysteresis that is detrimental to magnetic refrigeration. We find that the ferromagnetic transition is coupled to a martensitic-like transformation. Although crystal structure is the same for both paramagnetic (PM) and ferromagnetic (FM) phases, large lattice distortion occurs during the PM-FM transition, which induces energy barrier of about 13.6 kJ/mol. Supercooling or superheating is therefore needed to overcome the energy barrier, which causes the thermal hysteresis for the ferromagnetic transition.

Original language	English
Pages (from-to)	96-99
Number of pages	4
Journal	Scripta Materialia
Volume	138
DOIs	https://doi.org/10.1016/j.scriptamat.2017.05.043
Publication status	Published - 2017 Sept

Keywords

(Mn,Fe)(P,Si)
Magneto-caloric
Phase transformations
Thermal hysteresis
Transmission electron microscope

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10.1016/j.scriptamat.2017.05.043

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title = "Structural origin of hysteresis for hexagonal (Mn,Fe)2(P,Si) magneto-caloric compound",

abstract = "We performed in-situ transmission electron microscope observations on the unconventional ferromagnetic transition in hexagonal (Mn,Fe)2(P,Si) magneto-caloric compounds in order to understand the origin of the large thermal hysteresis that is detrimental to magnetic refrigeration. We find that the ferromagnetic transition is coupled to a martensitic-like transformation. Although crystal structure is the same for both paramagnetic (PM) and ferromagnetic (FM) phases, large lattice distortion occurs during the PM-FM transition, which induces energy barrier of about 13.6 kJ/mol. Supercooling or superheating is therefore needed to overcome the energy barrier, which causes the thermal hysteresis for the ferromagnetic transition.",

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T1 - Structural origin of hysteresis for hexagonal (Mn,Fe)2(P,Si) magneto-caloric compound

AU - Miao, Xue Fei

AU - Sepehri-Amin, Hossein

AU - Hono, Kazuhiro

PY - 2017/9

Y1 - 2017/9

N2 - We performed in-situ transmission electron microscope observations on the unconventional ferromagnetic transition in hexagonal (Mn,Fe)2(P,Si) magneto-caloric compounds in order to understand the origin of the large thermal hysteresis that is detrimental to magnetic refrigeration. We find that the ferromagnetic transition is coupled to a martensitic-like transformation. Although crystal structure is the same for both paramagnetic (PM) and ferromagnetic (FM) phases, large lattice distortion occurs during the PM-FM transition, which induces energy barrier of about 13.6 kJ/mol. Supercooling or superheating is therefore needed to overcome the energy barrier, which causes the thermal hysteresis for the ferromagnetic transition.

AB - We performed in-situ transmission electron microscope observations on the unconventional ferromagnetic transition in hexagonal (Mn,Fe)2(P,Si) magneto-caloric compounds in order to understand the origin of the large thermal hysteresis that is detrimental to magnetic refrigeration. We find that the ferromagnetic transition is coupled to a martensitic-like transformation. Although crystal structure is the same for both paramagnetic (PM) and ferromagnetic (FM) phases, large lattice distortion occurs during the PM-FM transition, which induces energy barrier of about 13.6 kJ/mol. Supercooling or superheating is therefore needed to overcome the energy barrier, which causes the thermal hysteresis for the ferromagnetic transition.

KW - (Mn,Fe)(P,Si)

KW - Magneto-caloric

KW - Phase transformations

KW - Thermal hysteresis

KW - Transmission electron microscope

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JO - Scripta Materialia

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Structural origin of hysteresis for hexagonal (Mn,Fe)₂(P,Si) magneto-caloric compound

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Keywords

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