Structural analysis of Sm3+ doped nanocrystalline Mg―Cd ferrites prepared by oxalate co-precipitation method

• Published in: Materials characterization Vol. 60; no. 11; pp. 1328 - 1333
• Main Authors: GADKARI, A. B, SHINDE, T. J, VASAMBEKAR, P. N
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier 01.11.2009
• Subjects: Cross-disciplinary physics: materials science; rheology; Crystallites; Density; Exact sciences and technology; Infrared radiation; Lattice parameters; Materials science; Mathematical analysis; Oxalates; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Solidification; Spectra; Sulfates; Ferrites; Ferrite; Precipitation; Lattice constant; Rare earths; Doping; Crystallite size; Oxalates; Rare earth; Microstructure; Co-precipitation; Nanocrystal
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2009.06.010

The structural properties of polycrystalline Sm3+ doped Mg1-xCdxFe2O4 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) prepared by oxalate co-precipitation from high purity sulphates were studied. The samples were sintered at 1050 C for 5 h. XRD confirmed the formation of a cubic spinel structure. Different parameters such as lattice constant, X-ray density, physical density, porosity, crystallite size, site radii and bond length on tetrahedral and octahedral sites were calculated. The lattice constant increased with increasing Cd2+ content and showed non linear behaviour. The crystallite size was calculated using the Scherrer formula and varied from 28.69 to 32.05 nm. Physical densities were obtained. The surface morphology, studied by SEM, showed that the grain size of the samples increased with increasing Cd2+ content. The IR spectra showed two strong absorption bands around 5.87 x 10 exp(4)/m and 4.27 x 10 exp(4)/m on the tetrahedral and octahedral sites respectively. IR spectra also showed that Sm3+ occupies the octahedral B-site.