Large recalescence-like event at the first cooling across the magnetic transition of (Mn,Fe)<sub>2</sub>(P,Si) magnetocaloric materials

Journal article (2019)

Authors

F. Guillou RST/Fundamental Aspects of Materials and Energy - AS , Inner Mongolia Normal University China
. Yibole RST/Fundamental Aspects of Materials and Energy - AS , Inner Mongolia Normal University China
Z. Ou RST/Fundamental Aspects of Materials and Energy - AS , Inner Mongolia Normal University China
E.H. Brück RST/Fundamental Aspects of Materials and Energy - AS
O Tegus Inner Mongolia Normal University China
Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
Microstructure Phase transitions Metals and alloys Magnetic properties Undercooling
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Published Date

2019

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

Abstract

An unconventional phenomena is observed at the first-order magnetic transitions in (Mn,Fe)2(P,Si) materials. Here, we show that the first crossing of the transition upon cooling is associated with an abnormal temperature increase. While differential scanning calorimetry can detect this recalescence-like event, purposely-designed probes were employed to quantify it. Recalescence at a magnetic transition is extremely rare. But in (Mn,Fe)2(P,Si), it is even more remarkable by its amplitude, with the temperature rising up to +4.0 K. In (Mn,Fe)2(P,Si), this phenomenon is associated with irreversible burst-like evolution of the microstructure (increase in defect concentration and micro-cracking) and of the crystal structure.