Syntheses and Structures of the New Quaternary Group IV Tellurides Cs0.68CuTiTe4 and Cs3CuHf2Te10

Michael F. Mansuetto, Jason A. Cody, Samson Chien, James A Ibers

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10 Scopus citations

Abstract

The new compounds Cs0.68CuTiTe4 and Cs3CuHf2Te10 have been synthesized at 350 and 475 °C, respectively, through reaction of the elements with a Cs2Ten flux. Cs0.68CuTiTe4 crystallizes in space group C2h 3-C2/m of the monoclinic system with four formula units in a cell of dimensions a = 19.728(11), b = 3.923(2), c = 13.374(7) Å, 0 = 129.65(1)°, V = 796.9(7) Å3 (T = 113 K). Cs3CuHf2Te10 crystallizes in space group C1i-P1 of the triclinic system with two formula units in a cell of dimensions a = 9.889(5), b-10.916(6), c = 11.110(6) Å, α = 92.08(1), f = 90.15(1), y = 101.27(1)°, V = 1175.3(11) h (T = 113 K). The structures of both compounds have been determined by single-crystal X-ray methods. Cs0.68CuTiTe4 has a three-dimensional channel structure. Cs+ cations occupy the channels. The channels are built up from layers that are interconnected by Te-Te bonds. In these layers there are pairs of edge-shared CuTe4 tetrahedra that in turn edge-share to TiTe6 octahedra. The conductivity in the needle (b) direction is 5 x 10-3 Q-1cm-1 at room temperature. The structure of Cs3CuHf2Te10 comprises infinite one-dimensional chains of HfTe7 polyhedra and edge-shared CuTe4 tetrahedra; these chains are separated from one another by Cs+ cations. A chain may be formulated as 1[CuHf2(Te3)(Te2)3(Te)3-]. The conductivity in the needle [111] direction is <1 x 10-5 Q-1cm-1 at room temperature.

Original languageEnglish (US)
Pages (from-to)894-898
Number of pages5
JournalChemistry of Materials
Volume7
Issue number5
DOIs
StatePublished - Jan 1 1995

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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