Résumé:
Mg-substituted ferrites NiMg
x
Fe
1
.
1
−
(
2
/
3
)x
Cr
0
.
9
-
O
4
(
0
≤
x
≤
0
.
4
)
were studied using X-ray diffraction,
Mössbauer spectroscopy, and magnetic measurements. X-ray
diffraction patterns show that all samples have cubic spinel
structure. The temperature-dependent magnetic measure-
ments revealed that the compensation point
T
K
of NiFe
1
.
1
-
Cr
0
.
9
O
4
starts to approach the Curie temperature
T
C
as
Mg
2
+
substitution of Fe
3
+
increases, until the magnetic
compensation disappears at composition
x
=
0
.
4. The mag-
netization data at all concentrations are discussed in the light
of Néel’s molecular field model given the cations distribu-
tion obtained using the Mössbauer spectra analysis.
