Synthesis, structure, and physical properties of the new group IV ternary tellurides, Cu2MTe3 (M = Ti, Zr, Hf)

Patricia M. Keane*, James A Ibers

*Corresponding author for this work

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

The new close-packed compounds Cu2TiTe3, Cu2ZrTe3, and Cu2HfTe3 have been prepared through direct reactions of the elements. The compounds crystallize in space group C3 2h- C2 m of the monoclinic system with four formula units in cells of dimensions a = 19.73(3), b = 3.970(4), c = 7.076(4) Å, β = 95.7(1)° (T = 153 K) for Cu2TiTe3; a = 20.288(4), b = 4.065(2), c = 7.250(1) Å, β = 97.32(2)° (T = 153 K) for Cu2ZrTe3; a = 20.188(6), b = 4.054(1), c = 7.216(2) Å, β = 97.16(1)° (T = 111 K) for Cu2HfTe3. The Cu2HfTe3 structure has been solved by single crystal X-ray methods. The final R index on F2 0 for 1509 unique observations and 20 variables is 0.048. The Cu2HfTe3 structure is composed of distorted tetrahedral Cu atoms and distorted octahedral Hf atoms coordinated by Te atoms. These polyhedra are linked together through edge and face sharing. As there are no short Te···Te interactions the Cu atoms are in the +1 oxidation state and the Hf atoms are in the +4 oxidation state. The metal-metal interactions between the Cu atoms and the Hf and both Cu atoms form six-membered rings. These rings interconnect to create arsenic-like buckled sheets that run parallel to (201). Electrical resistivity measurements indicate that Cu2HfTe3 and Cu2ZrTe3 are metals with ρ{variant}286 ≈ 3.8 × 10-4 Ω cm and 2.0 × 10-3 Ω cm, respectively. Cu2ZrTe3 exhibits Pauli-paramagnetic behavior with χ ≈ 3.5 × 10-4 emu mol-1.

Original languageEnglish (US)
Pages (from-to)291-297
Number of pages7
JournalJournal of Solid State Chemistry
Volume93
Issue number2
DOIs
StatePublished - Jan 1 1991

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ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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