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Mössbauer effect studies of disordered Fe–Ru alloys
Author(s) -
Pöttker W. E.,
Paduani C.,
Ardisson J. D.,
Ioshida M. I.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200302062
Subject(s) - paramagnetism , ferromagnetism , antiferromagnetism , materials science , mössbauer spectroscopy , magnetization , hyperfine structure , curie temperature , ruthenium , annealing (glass) , condensed matter physics , phase (matter) , crystallography , chemistry , magnetic field , metallurgy , atomic physics , catalysis , physics , biochemistry , organic chemistry , quantum mechanics
The bcc and hcp phases of disordered Fe 100– x Ru x alloys are investigated with several experimental techniques to study the composition dependence of the magnetic properties in these structures. With an appropriate annealing the prepared samples are single phase. The iron rich alloys are ferromagnetic at room temperature with the bcc structure. However, an antiferromagnetic coupling is introduced with the addition of ruthenium. Above 30 at% Ru a paramagnetic behavior is observed at 300 K and 77 K, where the alloys have the hcp structure. In the ferromagnetic phase the Curie temperature decreases steadly with the increase of the ruthenium concentration. In the paramagnetic hcp phase the mean volume per atom is al‐most triplicated as compared to the bcc phase, which brings out the breakdown of the magnetization and the collapse of the hyperfine field at the iron sites simultaneously with the crystallographic phase transition. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)