Solid-State Structure and Electronic Properties of a Mixed-Valence Two-Dimensional Metal, Potassium Copper Sulfide (KCu4S3)

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

Research output: Contribution to journalArticle

81 Scopus citations

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. 60000 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
DOIs
StatePublished - Jan 1 1980
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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