Details

Autor(en) / Beteiligte

• Gadkari, A. B.
• Shinde, T. J.
• Vasambekar, P. N.

Titel

Structural and magnetic properties of nanocrystalline Mg–Cd ferrites prepared by oxalate co-precipitation method

Ist Teil von

• Journal of materials science. Materials in electronics, 2010, Vol.21 (1), p.96-103

Ort / Verlag

Boston: Springer US

Erscheinungsjahr

2010

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Polycrystalline spinel ferrites with general formula Mg 1− x Cd x Fe 2 O 4 ( x  = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) were prepared by oxalate co-precipitation method using high purity sulfates. The samples were sintered at 1,050 °C for 5 h. The structural properties of these samples were investigated by XRD, SEM and FTIR techniques. The X-ray diffraction analysis confirms the formation of single phase cubic spinel structure of all the samples. The lattice constant, X-ray density, physical density, porosity, crystallite size, site radii ( r A , r B ), bond length (A–O, B–O) on tetrahedral (A-site) and octahedral (B-site) were calculated for the samples. The lattice constant increases with increase in Cd 2+ content. The X-ray density increases with increase in Cd 2+ content. The crystallite size calculated by Scherrer formula is in the range of 27.79–30.40 nm. Physical densities are calculated by Archimedes principle. The SEM study shows that the grain size increases with increasing Cd 2+ content. The FTIR spectra shows two strong absorption bands around 576 and 431 cm −1 on the tetrahedral and octahedral sites, respectively. The dependence of saturation magnetization on Cd 2+ content suggests that A–B and B–B super exchange interaction are comparable in strength. Neel’s two sub lattice model is applicable up to x  ≤ 0.4, while Y–K three sub lattice models (canted spin) is predominant for x  ≥ 0.4.