Magnetic and thermoelectric properties of the Mn1−XNiXS solid solutions

The new sulphide Mn1−XNiXS (0 < X ≤ 0.1) solid solutions are synthesized. The structural, magnetic, electric and thermoelectric properties of the obtained materials have been studied. The X-ray diffraction analysis has shown that the synthesized Mn1−XNiXS samples have a NaCl-type FCC lattice. The Mn1−XNiXS samples are antiferromagnets with the Neel temperature (TN = 180 K for X = 0.05 and TN = 200 K for X = 0.1). The temperature dependence of magnetization is described by the Curie-Weiss law at T > TN. The conductivity type change from the hole to the electronic at X > 0.05 is revealed on the basis of the thermoelectric power measurements. The resistivity and thermopower behaviors are explained in terms of the impurity subband formation into MnS electron excitation gap.