NaCu6Se4: A layered compound with mixed valency and metallic properties

Mihai Sturza; Christos D. Malliakas; Daniel E. Bugaris; Fei Han; Duck Young Chung; Mercouri G. Kanatzidis

doi:10.1021/ic502137m

NaCu₆Se₄: A layered compound with mixed valency and metallic properties

Mihai Sturza, Christos D. Malliakas, Daniel E. Bugaris, Fei Han, Duck Young Chung, Mercouri G. Kanatzidis

Northwestern University

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14 Citations (Scopus)

Abstract

A new ternary compound NaCu₆Se₄ was synthesized from the reaction of Cu in a molten sodium polyselenide flux. The compound crystallizes in trigonal space group R3¯m with a = 4.0465(3) Å and c = 41.493(5) Å. The crystal structure contains flat two-dimensional slabs of ¹/_∞[Cu₆Se₄] with a unique structural arrangement, separated by Na cations. The compound contains mixed valency and has a high conductivity of ∼3 × 10³ S cm^-1 at room temperature, and exhibits increasing conductivity with decreasing temperature, indicating metallic behavior. A small positive thermopower (4-11 V K^-1 from 300 to 500 K) and Hall effect measurements indicate p-type transport with a carrier concentration of ∼2.8(3) × 10²¹ cm^-3 and a hole mobility of ∼8.75 cm² V^-1 s^-1 at 300 K. NaCu₆Se₄ exhibits temperature-independent Pauli paramagnetism.

Original language	English
Pages (from-to)	12191-12198
Number of pages	8
Journal	Inorganic Chemistry
Volume	53
Issue number	22
DOIs	https://doi.org/10.1021/ic502137m
Publication status	Published - Nov 17 2014

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ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

Cite this

Sturza, M., Malliakas, C. D., Bugaris, D. E., Han, F., Chung, D. Y., & Kanatzidis, M. G. (2014). NaCu₆Se₄: A layered compound with mixed valency and metallic properties. Inorganic Chemistry, 53(22), 12191-12198. https://doi.org/10.1021/ic502137m

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abstract = "A new ternary compound NaCu6Se4 was synthesized from the reaction of Cu in a molten sodium polyselenide flux. The compound crystallizes in trigonal space group R3¯m with a = 4.0465(3) {\AA} and c = 41.493(5) {\AA}. The crystal structure contains flat two-dimensional slabs of 1/∞[Cu6Se4] with a unique structural arrangement, separated by Na cations. The compound contains mixed valency and has a high conductivity of ∼3 × 103 S cm-1 at room temperature, and exhibits increasing conductivity with decreasing temperature, indicating metallic behavior. A small positive thermopower (4-11 V K-1 from 300 to 500 K) and Hall effect measurements indicate p-type transport with a carrier concentration of ∼2.8(3) × 1021 cm-3 and a hole mobility of ∼8.75 cm2 V-1 s-1 at 300 K. NaCu6Se4 exhibits temperature-independent Pauli paramagnetism.",

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AU - Sturza, Mihai

AU - Malliakas, Christos D.

AU - Bugaris, Daniel E.

AU - Han, Fei

AU - Chung, Duck Young

AU - Kanatzidis, Mercouri G.

PY - 2014/11/17

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N2 - A new ternary compound NaCu6Se4 was synthesized from the reaction of Cu in a molten sodium polyselenide flux. The compound crystallizes in trigonal space group R3¯m with a = 4.0465(3) Å and c = 41.493(5) Å. The crystal structure contains flat two-dimensional slabs of 1/∞[Cu6Se4] with a unique structural arrangement, separated by Na cations. The compound contains mixed valency and has a high conductivity of ∼3 × 103 S cm-1 at room temperature, and exhibits increasing conductivity with decreasing temperature, indicating metallic behavior. A small positive thermopower (4-11 V K-1 from 300 to 500 K) and Hall effect measurements indicate p-type transport with a carrier concentration of ∼2.8(3) × 1021 cm-3 and a hole mobility of ∼8.75 cm2 V-1 s-1 at 300 K. NaCu6Se4 exhibits temperature-independent Pauli paramagnetism.

AB - A new ternary compound NaCu6Se4 was synthesized from the reaction of Cu in a molten sodium polyselenide flux. The compound crystallizes in trigonal space group R3¯m with a = 4.0465(3) Å and c = 41.493(5) Å. The crystal structure contains flat two-dimensional slabs of 1/∞[Cu6Se4] with a unique structural arrangement, separated by Na cations. The compound contains mixed valency and has a high conductivity of ∼3 × 103 S cm-1 at room temperature, and exhibits increasing conductivity with decreasing temperature, indicating metallic behavior. A small positive thermopower (4-11 V K-1 from 300 to 500 K) and Hall effect measurements indicate p-type transport with a carrier concentration of ∼2.8(3) × 1021 cm-3 and a hole mobility of ∼8.75 cm2 V-1 s-1 at 300 K. NaCu6Se4 exhibits temperature-independent Pauli paramagnetism.

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Access to Document

10.1021/ic502137m