Sodium Trimer Ordering on NaxCoO2 Surface

Details Sodium Trimer Ordering on NaxCoO2 Surface Sodium Trimer Ordering on NaxCoO2 Surface

2008-05-05

arxiv.org/abs/0805.0475v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.100.206404

Sodium ion ordering on in situ cleaved NaxCoO2 (x=0.84) surface has been studied by ultra high vacuum scanning tunneling microscopy (UHV-STM) at room temperature. Three main phases, with p(3x3), (root 7 x root 7), and (2 root 3 x 2 root 3) hexagonal unit cells and 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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