E. H. Nickel, A. H. Webster, L. G. Ripley; Bond strengths in the disulphides of iron, cobalt and nickel. The Canadian Mineralogist ; 10 (5): 773–780. doi:
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Decrease of microhardness FeS 2 >CoS 2 >NiS 2 , ligand-field stabilization effects retain constant total cohesive energy, sulfur-sulfur bonds strengthened proportionately to weakening of sulfur-metal bonds, pyrite from Spain, cattierite from Shinkolobwe, Katanga, synthetic polycrystalline NiS 2
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