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Kristallchemie natürlicher Telluride I: Verfeinerung der Kristallstruktur des Sylvanits, AuAgTe4

Crystal chemistry of natural tellurides. I: Refinement of the crystal structure of sylvanite, AuAgTe4

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Zusammenfassung

Mikrosondenanalysen und die Verfeinerung der Kristallstruktur zeigen, daß Sylvanit, AuAgTe4, aus Baia de Arieş (=Offenbánya), Rumänien, eine stöchiometrische Zusammensetzung und eine geordnete Kristallstruktur besitzt (a=8,95(1) Å,b=4,478(5) Å,c=14,62(2) Å; β=145,35(5)°;Z=2; RaumgruppeP2/c−C 42h ). Das Au-Atom ist von sechs Te-Atomen in einer für die Oxidationszahl III charakteristischen [4+2]-Koordination umgeben. Um das Ag-Atom (Oxidationszahl I) sind ebenfalls sechs Te-Atome, jedoch in einer [2+2+2]-Koordination, angeordnet. Über gemeinsame Kanten bauen AuTe6- und AgTe6-Polyeder “Schichten” parallel (100) auf. Diese “Schichten” werden über Te2-Hanteln (Te−Te=2,82 Å) zu einem Gerüst verknüpft.

Summary

Electron microprobe analyses and the refinement of the crystal structure indicate, that sylvanite, AuAgTe4, from Baia de Arieş (=Offenbánya), Romania, has a stoichiometric composition and an ordered crystal structure (a=8.95(1) Å,b=4.478(5) Å,c=14.62(2) Å; β=145.35(5)°;Z=2; space groupP2/c−C 42h ). The Au atom is surrounded by six Te atoms in a [4+2] coordination as characteristic for oxidation state III. Around the Ag atom (oxidation state I) are also six Te atoms, but arranged in a [2+2+2] coordination. Via common edges the AuTe6 and AgTe6 polyhedra build up “sheets” parallel to (100). These “sheets” are combined to a network of Te2 dumbbells (Te−Te=2.82 Å).

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  1. F. Pertlik

    Present address: Institut für Mineralogie und Kristallographie der Universität Wien, A-1010, Wien, Österreich

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    Pertlik, F. Kristallchemie natürlicher Telluride I: Verfeinerung der Kristallstruktur des Sylvanits, AuAgTe4 . TMPM Tschermaks Petr. Mitt. 33, 203–212 (1984). https://doi.org/10.1007/BF01081381

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