Microstructure formation and magnetocaloric effect of the Fe2P-type phase in (Mn,Fe)2(P, Si, B) alloys

The relation between the microstructure and the magnetic properties of Fe2P-type (Mn,Fe)2(P,Si,B) based materials has been systematically investigated by changing the annealing temperature and time. X-ray diffraction, Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy measurements...

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Bibliographic Details
Published in:Journal of alloys and compounds 2018-02, Vol.735, p.2567-2573
Main Authors: Lai, J.W., Zheng, Z.G., Huang, B.W., Yu, H.Y., Qiu, Z.G., Mao, Y.L., Zhang, S., Xiao, F.M., Zeng, D.C., Goubitz, K., Brück, E.
Format: Article
Language:English
Subjects:
(Mn,Fe)2(P, Si, B)
Entropy
Magnetic properties
Magnetocaloric
Microstructure formation
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Summary:The relation between the microstructure and the magnetic properties of Fe2P-type (Mn,Fe)2(P,Si,B) based materials has been systematically investigated by changing the annealing temperature and time. X-ray diffraction, Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy measurements show that the alloys contain the main Fe2P-type phase and two impurity phases of (Fe,Mn)5Si3-type and Fe2MnSi-type. Boron appears to facilitate the formation of the Fe2P-type phase during the arc-melting progress. Upon increasing the annealing temperatures from 1123 to 1423 K, the Curie temperature (TC) decreases from 302.0 to 270.5 K in the Mn1.15Fe0.85P0.55Si0.45 alloys and the magnetic-entropy change (ΔSM) increases linearly with annealing temperature. For the Mn1.15Fe0.85P0.52Si0.45B0.03 alloys annealed at 1423 K for different times, TC decreases from 263.8 and 232.8 K with increasing annealing time and ΔSM reaches a maximum value after annealing for 48 h. The differences in the annealing temperature and time influence the Si content in the Fe2P-type phase of the alloys and determine TC, the thermal hysteresis and the magneto-elastic transition. •The samples consist of Fe2P-type, (Fe, Mn)5Si3-type and Fe2MnSi-type phase.•Boron facilitates the formation of Fe2P-type phase during the arc-melting progress.•Faction of Fe2P-type phase can be tailored by different annealing conditions.•TC decreases while ΔSM increases for increasing the annealing temperature.•TC and ΔSM can be tuned by varying the annealing time.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.11.287