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Application of Rietveld Method to the Structural Characteristics of Substituted Copper Ferrite Compounds
Author(s) -
Ahmed Farag I.S.,
Ahmed M.A.,
Hammad S.M.,
Moustafa A.M.
Publication year - 2001
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/1521-4079(200101)36:1<85::aid-crat85>3.0.co;2-0
Subject(s) - rietveld refinement , spinel , isotropy , valence (chemistry) , ferrite (magnet) , copper , ceramic , materials science , lattice constant , lattice (music) , crystallography , analytical chemistry (journal) , chemistry , thermodynamics , crystal structure , metallurgy , diffraction , composite material , physics , organic chemistry , chromatography , quantum mechanics , acoustics , optics
A series of ferrite samples of the chemical composition Cu 0.7 (Zn 0.3‐x Mg x )Al 0.3 Fe 1.7 O 4 [x=0.05, 0.1, 0.15 and 0.2], prepared by ceramic technique at 1000°C, were found to have cubic spinel structure. On applying the full pattern fitting of Rietveld method using FullProf program, the exact coordinates of atoms, the unit cell dimensions, the atom occupation factors, isotropic temperature factors, the profile shape parameters as well as the interatomic distances have been determined. It was found that the lattice parameter decreases with increasing the Mg content. Also the variation of the cation distribution has been discussed on the basis of site preference, size and valence of the substituting cations. The low isotropic microstrain values obtained during the refinement process may be attributed to the method of the preparation in which the samples after the last sintering were treated by annealing.