Solid-state structure and electronic properties of a mixed-valence two-dimensional metal, KCu4S3

David B. Brown, Jon A. Zubieta, P. A. Vella, Jon A Zubieta, Timothy Watt, William E. Hatfield, Peter Day

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Abstract

KCu4S3, prepared by the high-temperature reaction of copper, potassium carbonate, and sulfur, crystallizes with a unique layered structure. Double layers of tetrahedrally coordinated (by S) copper ions are separated by layers of potassium ions. Although formally a mixed-valence Cu(I, I, I, II) complex, all copper ions are crystallographically equivalent. Consistent with its Robin and Day class III designation, KCu4S3 exhibits electrical conductivity characteristic of a metal. Room-temperature compaction conductivities of ca. 4000 Ω-1 cm-1 increase to ca. 60 000 Ω-1 cm-1 at 20 K. The metallic nature of this two-dimensional material is supported by the temperature-independent paramagnetism and the metallic reflectivity through the visible and near-ultraviolet region of the spectrum.

Original languageEnglish (US)
Pages (from-to)1945-1950
Number of pages6
JournalInorganic Chemistry
Volume19
Issue number7
StatePublished - 1980
Externally publishedYes

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ASJC Scopus subject areas

  • Inorganic Chemistry

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Brown, D. B., Zubieta, J. A., Vella, P. A., Zubieta, J. A., Watt, T., Hatfield, W. E., & Day, P. (1980). Solid-state structure and electronic properties of a mixed-valence two-dimensional metal, KCu4S3 . Inorganic Chemistry, 19(7), 1945-1950.