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Mössbauer Study of Zn x Cu 1− x Fe 1.2 Cr 0.8 O 4
Author(s) -
An D. H.,
Kang K. U.,
Lee B. G.,
Lim J. B.,
Jang S. U.,
Baek K. S.,
Choi E. J.,
Oak H. N.
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.200301924
Subject(s) - spin canting , hyperfine structure , mössbauer spectroscopy , spinel , analytical chemistry (journal) , lattice constant , crystallography , octahedron , chemistry , materials science , diffraction , crystal structure , magnetization , magnetic field , metallurgy , physics , atomic physics , quantum mechanics , chromatography , optics
Zn x Cu 1− x Fe 1.2 Cr 0.8 O 4 ( x = 0.0, 0.2, 0.4, 0.6) have been studied by Mössbauer spectroscopy, SQUID magnetometry, and X‐ray diffraction. The crystals are found to have a cubic spinel structure, and the lattice constant a 0 increases linearly with increasing Zn concentration x . The iron ions are in ferric states and occupy both the tetrahedral (A) and octahedral (B) sites; the fraction of the iron irons at the A‐sites is 0.70 for x = 0 and decreases to 0.40 for x = 0.6. As the Zn concentration increases, both Néel temperature and magnetic hyperfine field decrease monotonically. While spin orderings are collinear for low Zn concentrations ( x > 0.2), the spin canting emerges for x > 0.2 and increases with increasing Zn concentration; the canting angle at liquid helium temperature reaches up to 37° for x = 0.6. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)