Cation distribution of the system CuAlxFe2-xO4 by X-rays and Mossbauer studies

• Published in: Journal of materials science Vol. 35; no. 21; pp. 5523 - 5526
• Main Authors: TRIVEDI, B. S, JANI, N. N, JOSHI, H. H, KULKARNI, R. G
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.11.2000; Springer Nature B.V
• Subjects: Cations; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Copper; Crystals; Cubic lattice; Exact sciences and technology; Ferric ions; Hyperfine structure; Inorganic compounds; Lattice parameters; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Materials science; Mathematical analysis; Mossbauer effect; other γ-ray spectroscopy; Mossbauer spectroscopy; Mössbauer effect; other γ-ray spectroscopy; Physics; Solid solutions; Spectrum analysis; Spinel; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Water, oxides, hydroxides, peroxides; X-rays; Hyperfine magnetic field; Inorganic compounds; Transition element compounds; Moessbauer spectroscopy; Oxides; XRD; Experimental study; Ion distribution; Ferrites spinels; Solid solutions; Crystallographic site; Cations; Chemical composition; Iron oxides; Copper oxides; Saturation magnetization; Aluminium oxides; Crystal structure
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1004841601270

The structural and Mossbauer spectroscopy studies have been performed on the spinel solid solution series CuAlxFe2−xO4 (0.0 ≤ x ≤ 1.0). All the compounds with 0.0 ≤ x ≤ 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.