Li-gallium ferrites with the chemical formula Li0.5GaxFe2.5-xO4 (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 Ga3+ content. (C) 2009 Published by Elsevier B.V.