Die Kristallstruktur des β-Tetraargentotellurnitrates, β-[Ag 4 Te][NO 3 ] 2

Die Kristallstruktur von Ag5−x Te3 wurde durch Einkristall‐Röntgenstrukturanalyse ermittelt. Die Struktur besitzt hexagonale Symmetrie (P62m, Nr. 189) mit a = 13,456(9) Å und c = 16,917(9) Å. Die Verbindung besteht aus beweglichen Silberkationen, die in einem Tellur‐Gerüst von Frank‐Kasper‐Polyedern verteilt sind. Tellur liegt als Te2− und als Te22−‐Hantel vor und bildet drei verschiedene Arten von Tetraederlücken. Die Verteilung des Silbers auf die Tetraederlücken wird beschrieben. Daraus resultieren Vorschläge für mögliche Diffusionspfade. Schließlich wird der Homogenitätsbereich von Ag5−xTe3 aus der Struktur hergeleitet.

unclassified

“…Die zusatzliche dreifache Uberbriickung der Rechteckflachen der Prismen schlient die Koordinationssphare ab. Sie findet sich im P-[Ag,Te][NO,], wieder und wird von den Autoren als Tetrakaidekaeder bezeichnet[24].…”

unclassified

Die Kristallstruktur des synthetischen Stützits, Ag_5−xTe₃

Peters

Conrad

Bremer

et al. 1996

“…The XRD pattern indexing was performed using a TREOR‐90 program, and the analysis of the systematically absent reflections revealed that the compound belongs to either P 4 2 32 or P 2 1 3 space group 26. The crystal structure refinement was made by the Rietveld method in the P 2 1 3 space group using the model for the framework taken from the crystal structure of β ‐[Ag 4 Te](NO 3 ) 2 10. The positions of sulfur and oxygen atoms were found from Fourier syntheses.…”

Section: Methodsmentioning

confidence: 86%

“…It is very interesting to compare the crystal structure of the title compound with that of β‐Ag 4 Te(NO 3 ) 2 10. The 3D silver‐telluride framework has practically the same structure in both compounds.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Structure of Ag₄Te(SO₄) – a New Compound Featuring a Silver‐Telluride Framework

Shestimerova

Mitiaev

Davliatshin

et al. 2010

Tetrasilver telluride sulfate was obtained as a black air‐stable polycrystalline powder; its structure was determined from X‐ray powder diffraction data. The new compound crystallizes in the cubic space group P213, with the unit cell parameter a = 8.6263(2) Å and Z = 4. The crystal structure of Ag4Te(SO4) is composed of a positively charged silver‐telluride three‐dimensional framework, in which the isolated tetrahedral SO42– anions are embedded. The framework features an irregular coordination for tellurium atoms with a coordination number of six and manifold Ag–Ag contacts ranging from 2.99 to 3.14 Å. The distortion of the SO42– anion as well as the interactions within the framework and between the framework and the SO42– anions are analyzed with the help of the structural data, vibrational spectra, and band structure calculations.

Synthesis, Structure, and Properties of Ag₅Se(PO₄) and Ag₅Te(PO₄) with Two‐Dimensional Framework Trapping PO₄^3– anions

Shestimerova

Oleneva

Mitiaev

et al. 2009

New compounds Ag 5 Se(PO 4 ) and Ag 5 Te(PO 4 ) have been synthesized as black air-stable polycrystalline powders, and their structures determined from X-ray powder diffraction data. The two new compounds are isostructural and crystallize in the space group P4/nmm (No. 129) with the unit cell parameters a ϭ 6.8886(5), c ϭ 7.2724(7) Å , Z ϭ 2 and a ϭ 7.0098(5), c ϭ 7.3423(7) Å , Z ϭ 2, respectively. Their crystal structures comprise a positively charged silverϪchalcogen framework and separate tetrahedral PO 4 3Ϫ ions.