Sodium trimer ordering on a NaxCoO2 surface

Woei Wu Pai; S. H. Huang; Ying S. Meng; Y. C. Chao; C. H. Lin; H. L. Liu; F. C. Chou

doi:10.1103/PhysRevLett.100.206404

Sodium trimer ordering on a NaxCoO2 surface

Woei Wu Pai
, S. H. Huang
, Ying S. Meng
, Y. C. Chao
, C. H. Lin
, H. L. Liu
, F. C. Chou

Department of Physics

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Sodium ion ordering on an in situ cleaved NaxCoO2 (x=0.84) surface has been studied by ultrahigh vacuum scanning tunneling microscopy at room temperature. Three main phases, with p(3×3), (7×7), and (2 3×2 3) hexagonal unit cells and a surface Na concentration of 1/3, 3/7, 1/2, respectively, were identified. One surprising finding is that Na trimers act as the basic building blocks that order in long range. The stability of Na trimers is attributed to the increased Na coordination with oxygen as indicated by ab initio calculations, and possibly at finite temperature by configuration entropy.

Original language	English
Article number	206404
Journal	Physical Review Letters
Volume	100
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.100.206404
Publication status	Published - 2008 May 21

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.100.206404

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title = "Sodium trimer ordering on a NaxCoO2 surface",

abstract = "Sodium ion ordering on an in situ cleaved NaxCoO2 (x=0.84) surface has been studied by ultrahigh vacuum scanning tunneling microscopy at room temperature. Three main phases, with p(3×3), (7×7), and (2 3×2 3) hexagonal unit cells and a surface Na concentration of 1/3, 3/7, 1/2, respectively, were identified. One surprising finding is that Na trimers act as the basic building blocks that order in long range. The stability of Na trimers is attributed to the increased Na coordination with oxygen as indicated by ab initio calculations, and possibly at finite temperature by configuration entropy.",

author = "Pai, \{Woei Wu\} and Huang, \{S. H.\} and Meng, \{Ying S.\} and Chao, \{Y. C.\} and Lin, \{C. H.\} and Liu, \{H. L.\} and Chou, \{F. C.\}",

year = "2008",

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doi = "10.1103/PhysRevLett.100.206404",

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AU - Pai, Woei Wu

AU - Huang, S. H.

AU - Meng, Ying S.

AU - Chao, Y. C.

AU - Lin, C. H.

AU - Liu, H. L.

AU - Chou, F. C.

PY - 2008/5/21

Y1 - 2008/5/21

N2 - Sodium ion ordering on an in situ cleaved NaxCoO2 (x=0.84) surface has been studied by ultrahigh vacuum scanning tunneling microscopy at room temperature. Three main phases, with p(3×3), (7×7), and (2 3×2 3) hexagonal unit cells and a surface Na concentration of 1/3, 3/7, 1/2, respectively, were identified. One surprising finding is that Na trimers act as the basic building blocks that order in long range. The stability of Na trimers is attributed to the increased Na coordination with oxygen as indicated by ab initio calculations, and possibly at finite temperature by configuration entropy.

AB - Sodium ion ordering on an in situ cleaved NaxCoO2 (x=0.84) surface has been studied by ultrahigh vacuum scanning tunneling microscopy at room temperature. Three main phases, with p(3×3), (7×7), and (2 3×2 3) hexagonal unit cells and a surface Na concentration of 1/3, 3/7, 1/2, respectively, were identified. One surprising finding is that Na trimers act as the basic building blocks that order in long range. The stability of Na trimers is attributed to the increased Na coordination with oxygen as indicated by ab initio calculations, and possibly at finite temperature by configuration entropy.

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VL - 100

JO - Physical Review Letters

JF - Physical Review Letters

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Sodium trimer ordering on a NaxCoO2 surface

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