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The crystal structure of the subvalent nickel—lead sulfide, which has been described previously as Ni60Pb9S31, was established and the composition of this sulfide was refined based on powder X-ray diffraction data. The true Ni151.5Pb24S92 composition of this compound was confirmed by the EDX techniques. The temperature range of stability of this compound (490—578 °C) was refined by differential thermal...
The crystal structure of parkerite, Ni3Bi2S2, was studied by single-crystal X-ray diffraction analysis and refined. The single crystal was prepared by the method of chemical transport reactions. The electronic structure of Ni3Bi2S2 was calculated by the extended Hückel and DFT--LMTO--ASA methods. Substantial delocalization of electrons in the vicinity of the Fermi level and the presence of the strong...
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