Metallurgical Transactions A

, Volume 22, Issue 6, pp 1299–1304 | Cite as

Observations of the formation and kinetics of surface steps during evaporation and condensation

  • K. W. Keller
The Role of Ledges in Phase Transformations

Abstract

Surface step patterns produced by crystal growth or evaporation can be observed, e.g., on NaCl, AgBr, Ag, and Si, by means of the electron microscopic method of decoration. These observations give insight into the mechanisms (random two-dimensional (2-D) nucleation, formation of hills or pits by spirals or repeated preferential 2-D nucleation, kinematic step interaction, orientation dependence of step motion, light-influenced evaporation, and stage of coalescence of thin films) and molecular processes (surface and edge diffusion) of crystal and thin film growth. Combining the decoration and platinum-carbon replica techniques enables an interesting insight into the step kinetics during the process of faceting. The pinning of moving steps at impurities and their piling up are decisive particulars.

Keywords

Metallurgical Transaction AgBr Silver Halide Surface Step Impurity Particle 
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Copyright information

© The Minerals, Metals and Materials Society, and ASM International 1991

Authors and Affiliations

  • K. W. Keller
    • 1
  1. 1.Akademie der Wissenschaften der DDRInstitut fuer Festkoerperphysik und ElektronenmikroskopieHalleGerman Democratic Republic

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