Direct observation of charge transfer at a MgO(111) surface

被引：35

作者：

Subramanian, A

Marks, LD

Warschkow, O

Ellis, DE

机构：

[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

[2] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.92.026101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Transmission electron diffraction (TED) combined with direct methods have been used to study the root3xroot3R30degrees reconstruction on the polar (111) surface of MgO and refine the valence charge distribution. The surface is nonstoichiometric and is terminated by a single magnesium atom. A charge-compensating electron hole is localized in the next oxygen layer and there is a nominal charge transfer from the oxygen atoms to the top magnesium atom. The partial charges that we obtain for the surface atoms are in reasonable agreement with empirical bond-valence estimations.

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页数：4

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