Abstract
Li–gallium ferrites with the chemical formula Li
0.5Ga
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
=
1
A which is equivalent to 200
A
m
−1). At room temperature the relative permeability (
μ
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
μ
r,
M
r,
M
s and
P
s are composition dependent. The initial permeability (
μ
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.