X-RAY-OBSERVATION OF A CHEMICAL ORDER DRIVEN MORPHOLOGICAL TRANSITIONON THE SURFACE OF AN A(3)B TYPE ALLOY

Authors
BARBIER L GOAPPER S SALANON B CAUDRON R LOISEAU A
Citation
L. Barbier et al., X-RAY-OBSERVATION OF A CHEMICAL ORDER DRIVEN MORPHOLOGICAL TRANSITIONON THE SURFACE OF AN A(3)B TYPE ALLOY, Physical review letters, 78(15), 1997, pp. 3003-3006
Citations number
23
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
78
Issue
15
Year of publication
1997
Pages
3003 - 3006
Database
ISI
SICI code
0031-9007(1997)78:15<3003:XOACOD>2.0.ZU;2-R
Abstract
Surface induced chemical disorder and step unpairing transition are in vestigated by gazing x-ray diffraction on a vicinal surface of an A(3) B type alloy (Cu83Pd17). Both transformations occur below and close to the bulk order-disorder transition. The asymmetry of terraces and the order parameter reflecting chemical order in the surface layer are de termined by measuring the shape of crystal truncation rods. Step unpai ring and surface disordering are found to be continuous transitions.