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Site occupancy and anisotropy distribution of Al substituted Ba‐ferrite with high coercivity
Author(s) -
Choi Dong Hyeok,
An Sung Yong,
Lee Sang Won,
Shim InBo,
Kim Chul Sung
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.200304633
Subject(s) - coercivity , magnetocrystalline anisotropy , mössbauer spectroscopy , anisotropy , materials science , magnetization , magnetic anisotropy , ferrite (magnet) , magnetometer , saturation (graph theory) , crystallography , condensed matter physics , analytical chemistry (journal) , nuclear magnetic resonance , chemistry , magnetic field , physics , quantum mechanics , composite material , chromatography , mathematics , combinatorics
The site occupancy and anisotropy distribution of Al substituted BaFe 12− x Al x O 19 (0.0 ≤ x ≤ 4.0) have been studied with Mössbauer spectroscopy, X‐ray diffraction, and vibrating sample magnetometry. The results suggest that the coercivity, magnetization, and magnetocrystalline anisotropies are closely related to the distributions of Al 3+ ions on the five iron sites. Mössbauer spectra indicated that Al 3+ ions have a strong preference for the 4 f 1 , 2 a and 12 k sites. The substitution of Al 3+ by Fe 3+ in the system causes a drastic reduction of the saturation magnetization while the coercivity first increases to 8.6 kOe, for x = 2.0, and then decreases to 6.9 kOe, for x = 4.0. The origin of the changes in the magnetic properties caused by Al 3+ substitution can be attributed to the site preferences. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)