Magnetic refrigeration near room temperature with Fe2P-based compounds
- 30 November 2004
- journal article
- Published by Elsevier BV in Journal of Alloys and Compounds
- Vol. 383 (1-2), 32-36
- https://doi.org/10.1016/j.jallcom.2004.04.042
Abstract
The alloy MnFeP0.45As0.55 has been identified as a promising material to be used as magnetic refrigerant for room-temperature applications. This alloy, which is derived from the well-known iron pnictide Fe2P, exhibits a first-order temperature- and field-induced magnetic phase-transition. The Curie temperature can be varied by substitutions into the pnictide sublattice. We studied the effect of Ge substitution in this material. Most strikingly, we find a strong increase of the magnetic ordering temperature up to 570 K and a concomitant increase of the ordered magnetic moment up to 4.25 μB/f.u. for the alloy MnFeP0.5Ge0.5. On substitution with the large Ge ions, the expected lattice expansion is very anisotropic. We observe an increase and decrease of the a and c parameter of the hexagonal lattice, respectively. Compared with the (P,As) series, for a similar volume change we find a much stronger increase of TC. This confirms the importance of competing exchange interactions in this interesting alloy system.Keywords
This publication has 10 references indexed in Scilit:
- On the first-order phase transition in MnFeP0.5As0.4Si0.1Journal of Applied Physics, 2003
- Magnetic refrigeration—towards room-temperature applicationsPhysica B: Condensed Matter, 2003
- Magnetic-phase transitions and magnetocaloric effectsPhysica B: Condensed Matter, 2002
- Transition-metal-based magnetic refrigerants for room-temperature applicationsNature, 2002
- Magnetic-field-induced structural phase transition inPhysical Review B, 1998
- Giant Magnetocaloric Effect inPhysical Review Letters, 1997
- Pressure-Induced Antiferromagnetism of Fe2PJournal of the Physics Society Japan, 1985
- A Mössbauer study of Fe2P1−xSix (x ≤ 0.35)Journal of Solid State Chemistry, 1984
- Polarized Neutron Diffraction Study of Fe2P Single CrystalJournal of the Physics Society Japan, 1979
- Magnetic Properties of Fe2P Single CrystalJournal of the Physics Society Japan, 1977