Hi Laurence The amount of 0.05 of exact exchange is the value that gives a gap value equal to the experimental one for nickel sulphide and close values for magnetic moments for some 3d transition metal sulphides like CrS, FeS, CoS and NiS.
You can check my article about the nickel sulphide http://www.sciencedirect.com/science/article/pii/S0921452617303915 Best regards
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