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 | |
| Publication status | Published - Nov 17 2014 |
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ASJC Scopus subject areas
- Inorganic Chemistry
- Physical and Theoretical Chemistry
Cite this
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 journal › Article
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TY - JOUR
T1 - NaCu6Se4
T2 - A layered compound with mixed valency and metallic properties
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
Y1 - 2014/11/17
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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U2 - 10.1021/ic502137m
DO - 10.1021/ic502137m
M3 - Article
VL - 53
SP - 12191
EP - 12198
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 22
ER -