Sodium trimer ordering on a NaxCoO2 surface

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

Research output: Contribution to journalArticle

17 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 languageEnglish
Article number206404
JournalPhysical Review Letters
Volume100
Issue number20
DOIs
Publication statusPublished - 2008 May 21

Fingerprint

trimers
Scanning Tunnelling Microscopy
Sodium
sodium
Temperature
Entropy
Vacuum
ultrahigh vacuum
scanning tunneling microscopy
Ions
entropy
Oxygen
room temperature
oxygen
configurations
cells
ions
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Pai, W. W., Huang, S. H., Meng, Y. S., Chao, Y. C., Lin, C. H., Liu, H. L., & Chou, F. C. (2008). Sodium trimer ordering on a NaxCoO2 surface. Physical Review Letters, 100(20), [206404]. https://doi.org/10.1103/PhysRevLett.100.206404

Sodium trimer ordering on a NaxCoO2 surface. / Pai, Woei Wu; Huang, S. H.; Meng, Ying S.; Chao, Y. C.; Lin, C. H.; Liu, Hsiang Lin; Chou, F. C.

In: Physical Review Letters, Vol. 100, No. 20, 206404, 21.05.2008.

Research output: Contribution to journalArticle

Pai, WW, Huang, SH, Meng, YS, Chao, YC, Lin, CH, Liu, HL & Chou, FC 2008, 'Sodium trimer ordering on a NaxCoO2 surface', Physical Review Letters, vol. 100, no. 20, 206404. https://doi.org/10.1103/PhysRevLett.100.206404
Pai WW, Huang SH, Meng YS, Chao YC, Lin CH, Liu HL et al. Sodium trimer ordering on a NaxCoO2 surface. Physical Review Letters. 2008 May 21;100(20). 206404. https://doi.org/10.1103/PhysRevLett.100.206404
Pai, Woei Wu ; Huang, S. H. ; Meng, Ying S. ; Chao, Y. C. ; Lin, C. H. ; Liu, Hsiang Lin ; Chou, F. C. / Sodium trimer ordering on a NaxCoO2 surface. In: Physical Review Letters. 2008 ; Vol. 100, No. 20.
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