Journal
JOURNAL OF MATERIALS SCIENCE
Volume 35, Issue 21, Pages 5523-5526Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1004841601270
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The structural and Mossbauer spectroscopy studies have been performed on the spinel solid solution series CuAlxFe2-O-x(4) (0.0 less than or equal to x less than or equal to 1.0). All the compounds with 0.0 less than or equal to x less than or equal to 1.0 crystallised with cubic spinel structure. Lattice constant values calculated from XRD analysis were found to decrease on increasing x, linearly obeying Vegard's law. The X-ray intensity calculations indicated that Cu2+ prefers to occupy octahedral (B) site, where as Al3+ ions replace Fe3+ ions from both tetrahedral (A) and octahedral (B) sites. Mossbauer spectra at room temperature display magnetic sextets corresponding to A and B-sites superimposed on each other. The data shows that Al-possesses greater preference for B-site compared to A-site, and iron exists in high spin ferric Fe3+ state. The hyperfine fields for both A and B-sites decrease with increasing x. The cation distribution calculated from X-ray intensity data agrees with the Mossbauer results. (C) 2000 Kluwer Academic Publishers.
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