Silver(I) chalcogenide halides Ag19Te6Br7, Ag19Te6 Br5.4I1.6, and Ag19 Te5SeBr7

Tom Nilges, Julia Messel, Melanie Bawohl, Stefan Lange

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Systematic examinations for new phases on the quasi-binary section AgX-Ag2Q (with X = halide and Q = chalcogenide) led to the exploration of the three new compounds Ag19 Te6Br7, Ag19Te6 Br5.4I1.6, and Ag19 Te5SeBr7. All of them crystallize in new structure types with rigid anion and highly disordered silver substructures. A peritectic decomposition to the binary halides and chalcogenides and Ag23 Te12Br was observed for each compound between 693 and 719 K. Polymorphism, a common feature for solid state ion conductors, was found for Ag19 Te6Br7. Impedance spectroscopic investigations showed high conductivities (up to σ = 1. 1 × 10 -2 Ω-1 cm-1, 323 K, Ag19Te6 Br5.4I1.6) and low activation energies (Ea = 0.19 eV, α-Ag19 Te6Br7) at room temperature. A topological description of the rigid and complex anion substructure was used to classify the three different structures. Linearly arranged nets of anions, separated from each other by the disordered silver ions, corrugate under partial substitution of either the halide or chalcogenide ions. The topological approach is a fundamental tool to understand the structure property relations in more detail.

Original languageEnglish
Pages (from-to)4080-4091
Number of pages12
JournalChemistry of Materials
Volume20
Issue number12
DOIs
StatePublished - 24 Jun 2008
Externally publishedYes

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