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THE CRYSTAL STRUCTURE OF BERRYITE, Cu3Ag2Pb3Bi7S16
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hubert Putz |
| Copyright Year | 2006 |
| Abstract | The crystal structure of berryite, ideally Cu3Ag2Pb3Bi7S16, monoclinic, a 12.703(2), b 4.0305(7), c 28.925(5) Å, b 102.484(2)°, space group P21/m, Z = 2, Dcalc = 6.899 g/cm3, has been solved by direct methods and refined to an R1 index of 6.4% for 2352 unique reflections measured with MoKa X-radiation on a three-circle diffractometer equipped with a CCD areadetector. There are fifteen unique Me sites and sixteen S sites in the asymmetric unit. Three Pb sites and two Bi sites are located on the surfaces of PbS-like slabs four layers thick, of two kinds; four Bi sites and two Ag sites are located in the interior of the slabs. Copper atoms in triangular coordination lie in a single S layer, with pseudohexagonal geometry. One Bi site straddles the interspace between the PbS-like slab and the S–Cu layer. Three primitive pseudotetragonal subcells of the PbS-like slab match with two orthohexagonal subcells of the Cu–S layer; this semicommensurate lock-in structure is made possible by the extension of the a parameter of the PbS-like slab by insertion of wide AgS2+4 octahedra (linear S–Ag–S coordinations). The structure determined allowed us to derive model structures of orthorhombic berryite (a polytypic variant) and of watkinsonite, Cu2PbBi4(Se,S)8. Structures of Ca2Sb2S5 and La4In5S13 follow the same modular principles. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://rruff.info/doclib/cm/vol44/CM44_465.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Charge-coupled device Clinical act of insertion Crystal structure FBXO38 wt Allele Insertion Mutation Kilogram per Liter Lead Population Parameter Portable Batch System Radiation Reflection (computer graphics) Silver Sixteen Slab allocation anatomical layer milliliter |
| Content Type | Text |
| Resource Type | Article |
