Study of the Structural and Magnetic Properties of Li Substituted Cu-Mn Mixed Ferrites

Abstract

A very fast auto-combustion reaction technique was applied for the preparation of a series of LixCu0.12Mn0.88 - 2xFe2 + xO4 ferrites in a wide range of composition (with x = 0.00, 0.10, 0.20, 0.30, 0.40 and 0.44). Disc and toroid shaped samples were prepared and sintered at various temperatures, in namely, 1200, 1250, 1300 °C in air for 1 hour. The spinel structure of all these samples were confirmed by X-ray diffraction and grain size estimation obtained from the optical microscope. It has been found that the lattice constant increases linearly with increasing Li contents. The grain size increases with increasing Li content and sintering temperature in LixCu0.12Mn0.88 - 2xFe2 + xO4. The magnetic properties of these compositions are characterized by high frequency (10 KHz-120 MHz) magnetic permeability measurements. The real part of initial permeability, µi/ increases with increasing Li content. It has also been observed that μi/ for each sample increases with sintering temperatures because of uniform grain growth. The relative quality factor, Q increases with increasing sintering temperature. Among all the samples, the highest value of Q-factor has been observed for x = 0.40 sintered at 1300 °C.