Faceting transformations of the stepped Pt(001) surface

We describe x-ray scattering studies of the structure and morphology of a stepped Pt(001) surface between 300 and 1850 K. Two distinct faceting transformations are observed. Above 1820 K, we find an unreconstructed, stepped surface. Between 1820 and 1620 K, there is coexistence among hexagonally rec...

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Bibliographic Details
Published in:Physical review letters 1993-11, Vol.71 (19), p.3166-3169
Main Authors: WATSON, G. M, GIBBS, D, ZEHNER, D. M, MIRANG YOON, MOCHRIE, S. G. J
Format: Article
Language:English
Subjects:
360102 - Metals & Alloys- Structure & Phase Studies
Applied sciences
COHERENT SCATTERING
Condensed matter: structure, mechanical and thermal properties
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DIFFRACTION
DOMAIN STRUCTURE
ELEMENTS
Exact sciences and technology
MATERIALS SCIENCE
METALS
Metals. Metallurgy
MICROSTRUCTURE
MORPHOLOGY
PHASE TRANSFORMATIONS
Phase transitions and critical phenomena
PHYSICAL PROPERTIES
Physics
PLATINUM
PLATINUM METALS
SCATTERING
Solid surfaces and solid-solid interfaces
Structure of solids and liquids
crystallography
SURFACE PROPERTIES
Surface structure and topography
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
X-ray absorption spectroscopy: exafs, nexafs, xanes, etc
X-RAY DIFFRACTION
X-ray diffraction and scattering
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Summary:We describe x-ray scattering studies of the structure and morphology of a stepped Pt(001) surface between 300 and 1850 K. Two distinct faceting transformations are observed. Above 1820 K, we find an unreconstructed, stepped surface. Between 1820 and 1620 K, there is coexistence among hexagonally reconstructed, step-free domains and unreconstructed, stepped domains. The tilt angle of the unreconstructed domains exhibits a one-half power-law dependence on reduced temperature. At 1620 K, there is a second morphological transformation at which the unreconstructed domains are replaced by [ital magic] [ital vicinals].
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.71.3166