DEVELOPMENT=OF FERRITE MATERIAL FOR INFRARED ABSORPTION - -U-SING Zn, .-M.g

Abstract

Composition of polycrystalline Zn~MglFe2_yNdy04 (x=0.00, 0.20, 0.40, 0.60, 0.90 and y=0.00, 0.05) ferrites were prepared by standard ceramic method and characterized by X-ray diffraction, Infrared absorption spectroscopy, and BH curve characterization. The X-ray diffraction characterization showed the basic raw materials inside the ferrite material. The B-H curve characterization shows increase of saturation magnetization with Znz+ concentration upto x=0.4 and a decrease thereafter. The infrared absorption characterizations of all the samples have been studied at room temperature in the range of 400 to 1000 cm-k. In all the cases spectrum consists of strong absorption, which represents the gyromagnetic resonant frequency. It has been observed that the gyromagnetic resonant frequency shifted towards lower frequency range from 2.91 l x 1012 to 1.9638x 1012 Hz as the Zn2+ concentration increases from x=0.0 to x=0.9. it has also been noticed that the absorption decreases with Zn2+ concentration increases upto x=0.6 and thereafter increases. An empirical relationship has been developed between Znz+ concentration x and the gyromagnetic resonant frequency wr. A theoretical relationship has been developed between grain size and gyromagnetic resonant frequency and verified experimentally. The substitution of small amount of Nd3+ ion shows the flatten of the absorption band i.e. increases the bandwidth.