Defect Structure of the NiS2 Disulphide

Abstract

Defect structure of NiS2 disulphide has been studied using marker technique and sulphidation rate measurements of NiS to NiS2, as a function of temperature and sulphur vapor pressure. It has been found that cation sublattice of the discussed compound is predominantly disordered and the prevailing defects are doubly ionized interstitial cations and quasi-free electrons. Using kinetic results, the self-diffusion coefficient of cations in NiS2 has been calculated basing on Wagner's theory of metal oxidation.

Keywords

• nickel disulphide
• marker technique
• thermogravimetric analysis
• defects
• diffusion