OXIDATION OF LANTHANUM OVERLAYERS ON CU(111)

被引：22

作者：

DEASHA, AM ^{[1
]}

NIX, RM ^{[1
]}

机构：

[1] UNIV LONDON QUEEN MARY & WESTFIELD COLL, DEPT CHEM, LONDON E1 4NS, ENGLAND

来源：

SURFACE SCIENCE | 1995年 / 322卷 / 1-3期

关键词：

COPPER; EPITAXY; GROWTH; LANTHANIDES; LANTHANUM OXIDE; LOW ENERGY ELECTRON DIFFRACTION (LEED); OXIDATION; X-RAY PHOTOELECTRON SPECTROSCOPY;

D O I：

10.1016/0039-6028(95)90015-2

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：

The oxidation of ultrathin lanthanum overlayers on Cu(111) has been studied by XPS, ISS, TPD and LEED. At 300 K the deposited La films are readily oxidised by exposure to O-2 to give a disordered La2O3 film. This oxide may then be ordered by annealing at over 700 K in vacuum, producing a surface analogous to La2O3(001). Further heating in a low pressure of oxygen induces an irreversible structural transformation to a more complex oxide structure which still exhibits a coincidence relationship with the substrate. All the oxide films are stable to 873 K, after which a gradual reduction in the apparent surface La and O concentrations is observed.

引用

页码：41 / 50

页数：10

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