A single crystal X-ray and high resolution electron microscope study of Pb5Sb6S14

The structure of Pb5Sb6S14, first observed by HREM, has been refined by single crystal X-ray diffraction. It is a higher homologue of robinsonite, Pb4Sb6S13, with a = 28.367(8) Å, b = 4.024(1) Å, c = 22.044(7) Å, α = 89.59(2), β = 92.28(3), γ = 89.93(2), space group I1, Z = 4. Pb5Sb6S14 is built from two different ribbons composed of square pyramidal (Pb, Sb)S5 groups with the narrow ribbon identical to that in robinsonite and the other ribbon …