Ab initio calculations on the Al2O3(0001) surface

被引：119

作者：

Batyrev, I ^{[1
]}

Alavi, A ^{[1
]}

Finnis, MW ^{[1
]}

机构：

[1] Queens Univ Belfast, Sch Math & Phys, Atom Simulat Grp, Belfast BT7 1NN, Antrim, North Ireland

来源：

FARADAY DISCUSSIONS | 1999年 / 114卷

关键词：

D O I：

10.1039/a903278i

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We calculate using a density functional pseudopotential method the atomic and electronic structure of the (0001) surface of alpha-alumina (Al2O3). The material is studied in the form of a slab with periodic boundary conditions, containing up to eight layers of the stoichiometric Al2O3 units. Five different terminations of the surface are calculated, representing different surface excesses of oxygen, and their free energies are estimated as a function of oxygen partial pressure. Internal relaxations of the atomic positions are obtained. The aluminium terminated surface, which is stoichiometric, has the lowest surface energy for a wide range of oxygen pressures.

引用

页码：33 / 43

页数：11

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