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

Xue Fei Miao, Hossein Sepehri-Amin, Kazuhiro Hono

Research output: Contribution to journalArticlepeer-review

9 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 languageEnglish
Pages (from-to)96-99
Number of pages4
JournalScripta Materialia
Volume138
DOIs
Publication statusPublished - 2017 Sep
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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