Open AccessMagnetocaloric Mn5Si3 and MnFe4Si3 at variable pressure and temperature
Author(s) -
Andreas Eich,
Andrzej Grzechnik,
Luana Caron,
Yao Cheng,
Johanna Wilden,
Hao Deng,
Vladimir Hutanu,
Martin Meven,
Michael Hanfland,
Konstantin Glazyrin,
Paul Hering,
Markus Guido Herrmann,
Mohammed Ait Haddouch,
Karen Friese
Publication year - 2019
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab33b3
Subject(s) - magnetic refrigeration , magnetocrystalline anisotropy , materials science , neutron diffraction , magnetization , condensed matter physics , hydrostatic pressure , lattice constant , atmospheric temperature range , transition temperature , phase transition , magnetic anisotropy , crystal structure , diffraction , crystallography , thermodynamics , magnetic field , chemistry , superconductivity , physics , quantum mechanics , optics
The influence of hydrostatic high pressure on the crystal structures and magnetic properties of magnetocaloric Mn 5 Si 3 and MnFe 4 Si 3 was studied with temperature dependent synchrotron powder diffraction, neutron single-crystal diffraction and magnetization measurements. Mn 5 Si 3 shows no indication for any pressure-induced structural phase transition up to 24.2 GPa at room temperature. MnFe 4 Si 3 exhibits no clear indication for any phase transition at high temperatures (296 K–373 K) and high pressures. Anomalies in the lattice parameter at low temperatures indicate a structural response to magnetic ordering. The gradient of decreasing magnetic transition temperature with increasing pressure is d T C /d P ≈ −15 K GPa −1 . The transition temperature in MnFe 4 Si 3 can be tuned by pressure in the temperature range relevant for applications, while pressure has hardly any detrimental influence on other key features relevant to magnetocaloric applications (the width of hysteresis, saturation magnetization, magnetocrystalline anisotropy).