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

Research output: Contribution to journalArticle

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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) 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 languageEnglish
Pages (from-to)12191-12198
Number of pages8
JournalInorganic Chemistry
Volume53
Issue number22
DOIs
Publication statusPublished - Nov 17 2014

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conductivity
paramagnetism
hole mobility
Paramagnetism
Hall effect
slabs
Hole mobility
Thermoelectric power
sodium
cations
Temperature
crystal structure
Carrier concentration
temperature
Cations
Molten materials
room temperature
Crystal structure
Sodium
Fluxes

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical 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

NaCu6Se4 : A layered compound with mixed valency and metallic properties. / Sturza, Mihai; Malliakas, Christos D.; Bugaris, Daniel E.; Han, Fei; Chung, Duck Young; Kanatzidis, Mercouri G.

In: Inorganic Chemistry, Vol. 53, No. 22, 17.11.2014, p. 12191-12198.

Research output: Contribution to journalArticle

Sturza, M, Malliakas, CD, Bugaris, DE, Han, F, Chung, DY & Kanatzidis, MG 2014, 'NaCu6Se4: A layered compound with mixed valency and metallic properties', Inorganic Chemistry, vol. 53, no. 22, pp. 12191-12198. https://doi.org/10.1021/ic502137m
Sturza, Mihai ; Malliakas, Christos D. ; Bugaris, Daniel E. ; Han, Fei ; Chung, Duck Young ; Kanatzidis, Mercouri G. / NaCu6Se4 : A layered compound with mixed valency and metallic properties. In: Inorganic Chemistry. 2014 ; Vol. 53, No. 22. pp. 12191-12198.
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