Magnetic properties of (Fe1−x M x )7Se8
Tóm tắt
The temperature dependence of the magnetization of the quenched and slowly cooled samples of Fe7Se8 and (Fe1−x
M
x
)7Se8 samples with M = cobalt and nickel and x=0.02, 0.05 and 0.08 are given. All the thermomagnetic curves obtained belong to the Weiss ferrimagnetic type. Discontinuities indicating a magnetic transformation to antiferromagnetic order were obtained for some samples. The magnetic moment at 0 and 78 K (M
0 and M78) dependence on nickel and cobalt concentrations are given. The temperature dependence of the reciprocal susceptibility in the paramagnetic range was studied, and the asymptotic Curie points are given. The values of the effective magnetic moment, μ
eff, and the number of unpaired electrons were calculated. The thermal variation of the electrical conductivity of the host material, Fe7Se8, is given.
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