Influence of hydrogenation and mechanical grinding on the structural and ferromagnetic properties of GdFeSi
Langue
en
Article de revue
Ce document a été publié dans
Zeitschrift fur Naturforschung B. 2016-01, vol. 71, n° 5, p. 419-424
Verlag der Zeitschrift Fuer Naturforschung
Résumé en anglais
Hydrogen insertion into GdFeSi induces (i) a structural transition from a tetragonal CeFeSi-type to a tetragonal ZrCuSiAs-type, (ii) an anisotropic expansion of the unit cell parameters because the a parameter decreases, ...Lire la suite >
Hydrogen insertion into GdFeSi induces (i) a structural transition from a tetragonal CeFeSi-type to a tetragonal ZrCuSiAs-type, (ii) an anisotropic expansion of the unit cell parameters because the a parameter decreases, whereas the c parameter increases, and (iii) a decrease in Curie temperature from 121 to 20 K. On the contrary, an amorphous ferromagnet (TC = 65 K) is obtained by mechanical grinding of GdFeSi. The three compounds (GdFeSi, GdFeSiH, and amorphous GdFeSi) were investigated by 57Fe Mössbauer spectroscopy. At 4.2 K, this study has revealed that the magnetically ordered Gd substructure produces a small transferred hyperfine magnetic field at the 57Fe nucleus.< Réduire
Mots clés en anglais
hydrogenation
magnetization
mechanical grinding
Mössbauer spectroscopy
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