Structure and phase behavior of the Ir(001) surface: X-ray scattering measurements

Citation
V. Jahns et al., Structure and phase behavior of the Ir(001) surface: X-ray scattering measurements, SURF SCI, 430(1-3), 1999, pp. 55-66
Citations number
29
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
SURFACE SCIENCE
ISSN journal
00396028 → ACNP
Volume
430
Issue
1-3
Year of publication
1999
Pages
55 - 66
Database
ISI
SICI code
0039-6028(19990621)430:1-3<55:SAPBOT>2.0.ZU;2-9
Abstract
We present the results of X-ray scattering studies of the structure and pha se behavior of the Ir(001) surface between room temperature and T = 2000 K. Two distinct phases have been identified. For temperatures above T = 1950 K, the Ir(001) surface is rough, similar to what has been observed for Pt(0 01) at elevated temperatures. Below about T = 1950 K, the surface reconstru cts to farm a quasi-hexagonal unit cell, which is commensurate with the sub strate lying beneath it. The measured X-ray intensities, both inplane and a long the specular rod, are consistent with a buckled, (5 x 1) description o f the structure, including a 15% expansion of the top layer spacing and an enhanced surface Debye-Waller factor. A detailed comparison is made of the phase behavior determined here for Ir(001) to that found earlier for Pt and Au(001). (C) 1999 Elsevier Science B.V. All rights reserved.