Numéro
J. Phys. Colloques
Volume 50, Numéro C7, Octobre 1989
X-ray and Neutron Scattering from Surfaces and Thin Films
Proceedings of the International Conference on Surface and Thin Film studies using Glancing-Incidence X-ray and Neutron Scattering
Page(s) C7-267 - C7-282
DOI https://doi.org/10.1051/jphyscol:1989728
X-ray and Neutron Scattering from Surfaces and Thin Films
Proceedings of the International Conference on Surface and Thin Film studies using Glancing-Incidence X-ray and Neutron Scattering

J. Phys. Colloques 50 (1989) C7-267-C7-282

DOI: 10.1051/jphyscol:1989728

PHASE TRANSITIONS IN CLEAN METAL SURFACES

I.K. ROBINSON

AT and T Bell Laboratories, 600 Mountain Avenue Murray Hill, NJ 07974, U.S.A.


Abstract
As temperature is changed, two entirely different kinds of structural phase transition can be seen in surfaces. The first involves reconstructed surfaces which can transform to a new structure or to a disordered state. We present x-ray data which show that W(001) undergoes such an order-disorder transition. The second class is roughening transitions from smooth at low T to rough at high T ; N(113) shows this behavior. Lastly we consider the interesting case of Pt(110) which appears to have characteristics of both kinds.


Résumé
Quand on change la température, on peut trouver plusieurs classes de transitions de phase dans les surfaces. D'abord il y a les changements de reconstruction, souvent ordre-désordre. Ici nous présentons le cas de W(001), qui est un exemple typique. Le deuxième cas, Ni(113), a une transition de rugosité : la surface est plate à basse température et rugueuse à haute température. Pt(110) est un cas intermédiaire, qui a des caractéristiques soit d'ordre-désordre soit de transition de rugosité.