Some magnetic properties of Li-Ga ferrite in low magnetic field

Li-gallium ferrites with the chemical formula Li(0.5)Ga(x)Fe(2.5-x)O(4) (x = 0, 0.1, 0.2. 0.3, 0.4 and 0.5) have been prepared by the ceramic method technique. The spinel structure in homogenous state was realized by X-ray diffraction analysis. The lattice parameter was determined for each composition and it was found approximately constant value (0.832 nm). Some magnetic properties such as magnetization M, and (B-H) loop were measured at room temperature. The magnetization M was measured in the range of magnetizing field up to 800 A m(-1). The B-H loops were measured at elevated temperature and magnetizing current (I = 1A which is equivalent to 200 A m(-1)). At room temperature the relative permeability (mu(r)) was calculated from M-H relation. Also, remanence magnetization (M(r)), saturation magnetization (M(s)) and apparent loss energy (P(s)) were estimated from B-H loops. It was found that mu(r), M(r), M(s) and P(s) are composition dependent. The initial permeability (mu(i)) was measured as a function of temperature from room temperature up to 893 K. The Curie temperature T(c) and paramagnetic temperatures (T(p) and T(s))were determined. These values of temperature have been found to decrease with increasing Ga(3+) content. (C) 2009 Published by Elsevier B.V.