Relaxation and Reconstruction of Solid Surfaces

Abstract

DiscussionMeeting of the Deutsche Bunsengesellschaft fir Physikalische Chemie, Erlangeo, September 25 -2 , ~8 f :The study of phase transitions in three-dimensional matter has a long-standing tradition and became of renewed during recent years, mainly due to theoretical Progress. Similar phenomena are observed at solid surfaces, for which systems the reduced dimensionality offers easier DavispJoonan (1983) [30] Adams et al. (1983) [29] Davis/Noonan (1981) [36] Davis/Zehner (1980) [3TJ ~ ~ The (-) sign indicates a layer distance contraction, (+) indicates an expansion. Phase transitions and phase diagrams of two-dimensional systems are quite distinct from three-dimensional behaviour. Topological defects such as steps, domains and domain-wall dislocations play a key role. This paper discusses the nature and scale of the atomic fluctuations at phase boundaries for order-to-disorder structural phase transformations on solid surfaces. The question of the rich variety of con-Ber. Bunsenges. Phys. Chem. 90, 190-197 (1986) -0 VCH Verlagsgesellschaft mbH, D-6940 Weinheim, 1986.