Magnetic phase diagram of the mn<sub>x</sub> fe<sub>2−x</sub> p<sub>1−y</sub> si<sub>y</sub> system

Journal article (2022)

Authors

X. You RST/Fundamental Aspects of Materials and Energy - AS
M. Maschek RST/Fundamental Aspects of Materials and Energy - AS
N.H. van Dijk RST/Fundamental Aspects of Materials and Energy - AS
E.H. Brück RST/Fundamental Aspects of Materials and Energy - AS
Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
Copyright: © 2022 X. You, M. Maschek, N.H. van Dijk, E.H. Brück
DOI
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https://doi.org/10.3390/e24010002
Magnetocaloric materials Phase diagram Magnetic entropy Mn-Fe-P-Si Thermal hysteresis Transition temperature
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Published Date

2022

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

Abstract

The phase diagram of the magnetocaloric Mnx Fe2−x P1−y Siy quaternary compounds was established by characterising the structure, thermal and magnetic properties in a wide range of compositions (for a Mn fraction of 0.3 ≤ x < 2.0 and a Si fraction of 0.33 ≤ y ≤ 0.60). The highest ferromagnetic transition temperature (Mn0.3 Fe1.7 P0.6 Si0.4, TC = 470 K) is found for low Mn and high Si contents, while the lowest is found for low Fe and Si contents (Mn1.7 Fe0.3 P0.6 Si0.4, TC = 65 K) in the Mnx Fe2−x P1−y Siy phase diagram. The largest hysteresis (91 K) was observed for a metal ratio close to Fe:Mn = 1:1 (corresponding to x = 0.9, y = 0.33). Both Mn-rich with high Si and Fe-rich samples with low Si concentration were found to show low hysteresis (≤2 K). These compositions with a low hysteresis form promising candidate materials for thermomagnetic applications.