Refinement of the crystal structur,e of hutchinsonite, TIPbAs5,S9
نویسنده
چکیده
Hutchinsonite, TlPbAssSg, M,. = 1074.72, orthorhombic, Pbca, a = 10.786(3) A, b = 35.389(8) A, c = 8.141(3) A, Z = 8, Dx = 4.59 g/cm3, {L(MoK" = 330.60 cm 1, F(OOO) = 3776, locality:: Qilliruvika, Peru. The anisotropic refinement converged to give the value of R = 00.045(wR = 0.046) for 2992 reflections used. The Pb and TI atoms occupy distinct sites M 1 and M2, respectively. The former has seven S neighbours while the latter ten,. giving average M S distances 3.056(3) A and 3.451 (4) A, respectively. The ordered arrangement of Pb and Tl has been .fully supported by the Hamilton test and bond-valence calculations. The average vah.iles of As S, S -. S distances and S As S angles of the AsS3 Idgonal pyramids are 2.278(1) A,3409(1) Aand 96.93(2)"', respectively.
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تاریخ انتشار 2006