The crystal structure of freieslebenite, PbAgSbS3*
Abstract
The crystal structure of freieslebenite, PbAgSbS3, has been determined with three-dimensional counter data (R = 3.2%). The structure was solved by the method of key shifts. The obtained structure is different from the model proposed by Hellner (1957); instead, it is isomorphous with marrite, PbAgAsS3, an As analogue of freieslebenite. The crystal is monoclinic, space group P21/a, with a = 7.518(1), b = 12.809(4), c = 5.940(1) Å, β = 92.25(1)° and Z = 4.
The structure is a superstructure of a PbS-type substructure. The displacements of the atoms from the ideal substructure are less in freieslebenite than in marrite, probably because of the larger atomic radius of Sb than that of As. Sb has the usual trigonal-pyramidal coordination of S atoms. The Sb–S distances are 2.431, 2.453 and 2.480(4) Å. The SbS3 pyramids are isolated from each other. Pb is coordinated with six S atoms in a distorted octahedral arrangement. The Pb–S distances range from 2.806 to 3.167(4) Å. Ag has three nearest S neighbours at the distances 2.522, 2.575 and 2.687(4) Å. The AgS3 group is nearly planar. A fourth S atom is at a distance of 2.928(4) Å from Ag, the Ag–S being approximately perpendicular to the AgS3 plane. The temperature factor of Ag is significantly larger and more anisotropic than those of the other atoms; this feature is common among related structures.
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Articles in the same Issue
- Struktur und absolute Konfiguration des Methylsulfonats von Penbutolol
- Röntgeneinkristallstrukturanalyse eines Chlorderivates von Permanentrot FRLL. Vergleich mit dem entsprechenden Derivat von Permanentbraun FG
- Linearer elektrooptischer Tensor des monoklinen Lithiumsulfat-Monohydrats
- The molecular and crystal structure of kavaic acid*
- The crystal structure of aramayoite Ag(Sb,Bi)S2*
- The crystal and molecular structure of [24] metacyclophane I*
- The crystal structure of freieslebenite, PbAgSbS3*
- Structure cristalline du monophosphate KTiPO5
- Oriented transformation of chalcophanite during thermal treatment
- Refinement of the crystal structure of gibbsite, Al(OH)3
- Distribution of stacking faults in relation to the growth of cadmium iodide polytypes
- Crystal structures of three CdI2 polytypes
- Deformation-induced thermoluminescence in NaCl:Sr
- Crystal data for (2-methallyl)triplienylstannane, bromodimethyl-2,4-pentanedionatoplatinum(IV), s-alanatopentaamminecobalt(III) perchlorate monohydrate and (1R, 3R or S, 4R, 6S)-1,3,6,8-tetrabromo-p-methane-2-one
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