Abstract

CeAsS crystallizes in the monoclinic group P2₁/b ; the unit cell dimensions are : a = 4.047 Å ; b = 5.616 Å ; c = 17.450 Å ; γ = 135.85°. There are four formulae per unit cell. The crystals are twinned by reticular pseudomerohedry. The structure (R = 0.093) is closely related to the antitype of Fe₂As. It shows compact arsenic planes separated by layers of SCe₅ pyramids. A c/2 pseudoperiod appears in the structure.

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