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

doi:10.1021/ic50209a024

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 journal › Article › peer-review

85 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 language	English (US)
Pages (from-to)	1945-1950
Number of pages	6
Journal	Inorganic Chemistry
Volume	19
Issue number	7
DOIs	https://doi.org/10.1021/ic50209a024
State	Published - 1980
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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

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.",

author = "Brown, {David B.} and Wrobleski, {James T.} and Timothy Watt and Zubieta, {Jon A.} and Vella, {P. A.} and Hatfield, {William E.} and Peter Day",

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T1 - Solid-State Structure and Electronic Properties of a Mixed-Valence Two-Dimensional Metal, Potassium Copper Sulfide (KCu4S3)

AU - Brown, David B.

AU - Wrobleski, James T.

AU - Watt, Timothy

AU - Zubieta, Jon A.

AU - Vella, P. A.

AU - Hatfield, William E.

AU - Day, Peter

PY - 1980

Y1 - 1980

N2 - 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.

AB - 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.

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

Abstract

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