B P Ladgaonkar
Articles written in Bulletin of Materials Science
Volume 23 Issue 2 April 2000 pp 87-90 Magnetic Materials
Influence of Nd3+ substitution on thermoelectric power of Zn-Mg ferrite system
B P Ladgaonkar P N Vasambekar A S Vaingankar
Polycrystalline ferrites, ZnxMg1−xFe2−yNdyO4 (
Volume 25 Issue 4 August 2002 pp 351-354 Magnetic Materials
Infrared absorption spectroscopic study of Nd3+ substituted Zn–Mg ferrites
B P Ladgaonkar C B Kolekar A S Vaingankar
Compositions of polycrystalline Zn𝑥Mg1-𝑥Fe2–𝑦Nd𝑦O4 (𝑥 = 0.00, 0.20, 0.40, 0.60, 0.80 and 1.00; 𝑦 = 0.00, 0.05 and 0.10) ferrites were prepared by standard ceramic method and characterized by X-ray diffraction, scanning electron microscopy and infrared absorption spectroscopy. Far infrared absorption spectra show two significant absorption bands, first at about 600 cm–1 and second at about 425 cm–1 , which were respectively attributed to tetrahedral (A) and octahedral (B) sites of the spinel. The positions of bands are found to be composition dependent. The force constants, $K_T$ and $K_O$, were calculated and plotted against zinc concentration. Compositional dependence of force constants is explained on the basis of cation–oxygen bond distances of respective sites and cation distribution.
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