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

研究成果: 雜誌貢獻期刊論文同行評審

17 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
文章編號206404
期刊Physical Review Letters
100
發行號20
DOIs
出版狀態已發佈 - 2008 5月 21

ASJC Scopus subject areas

  • 物理與天文學 (全部)

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