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Silver(I) Chalcogenide Halides Ag19Te6Br7, Ag19Te6Br5.4I1.6, and Ag19Te5SeBr7

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Download Hi-Res ImageDownload to MS-PowerPointCite This:Chem. Mater. 2008, 20, 12, 4080-4091
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    Silver(I) Chalcogenide Halides Ag19Te6Br7, Ag19Te6Br5.4I1.6, and Ag19Te5SeBr7
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    Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
    * Corresponding author. Fax: +49-251-83-36636. Phone: +49-251-83-36645 . E-mail: [email protected]
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    Chemistry of Materials

    Cite this: Chem. Mater. 2008, 20, 12, 4080–4091
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    https://doi.org/10.1021/cm800425u
    Published May 27, 2008
    Copyright © 2008 American Chemical Society
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    Abstract

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    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 Ag19Te6Br7, Ag19Te6Br5.4I1.6, and Ag19Te5SeBr7. 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 Ag23Te12Br was observed for each compound between 693 and 719 K. Polymorphism, a common feature for solid state ion conductors, was found for Ag19Te6Br7. Impedance spectroscopic investigations showed high conductivities (up to σ = 1.1 × 10 −2 Ω−1 cm−1, 323 K, Ag19Te6Br5.4I1.6) and low activation energies (Ea = 0.19 eV, α-Ag19Te6Br7) 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.

    Copyright © 2008 American Chemical Society

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    Supporting Information

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    Additional crystallographic data of the three title compounds (PDF) and CIF files. This material is available free of charge via the Internet at http://pubs.acs.org.

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    Cited By

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    This article is cited by 18 publications.

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    Chemistry of Materials

    Cite this: Chem. Mater. 2008, 20, 12, 4080–4091
    Click to copy citationCitation copied!
    https://doi.org/10.1021/cm800425u
    Published May 27, 2008
    Copyright © 2008 American Chemical Society
    Request reuse permissions

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