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Site preference for Zn2+ and Ge4+ in mixed ferrite ZnxGe1-xFe2O4

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4 Author(s)
Kim, Chul Sung ; Department of Physics, Kookmin University, Seoul 136‐702, Korea ; Ko, Heung Moon ; Lee, Woon Hwa ; Lee, Choong Sub

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Small amounts of Zn2+ and Ge4+ substituting for GeFe2O4 and ZnFe2O4, can efficiently increase the Neél temperature, thereby can be applied to magnetic device. The site preference of Fe2+ and Fe3+ in mixed ferrite ZnxGe1-xFe2O4 (X=0.6) with Mössbauer absorption and x‐ray diffraction was studied. Analysis of x‐ray diffraction indicates that the lattice constant is not in accord with Vegard’s law, suggesting Fe2+ and Fe3+ are located not only at B sites but at A sites. It is found that Debye temperatures of GeFe2O4 and ZnFe2O4 are 380±5 K and 361±5 K from Mössbauer measurements. Zn2+ and Ge4+ randomly occupy A site or B site. Mössbauer spectra of Zn0.6Ge0.4Fe2O4 reveal line broadening with increasing temperature and the relaxation effect at low temperature.

Published in:

Journal of Applied Physics  (Volume:73 ,  Issue: 10 )