Nucleation, growth and transformation of amorphous and crystalline solids condensing from the gas phase

Details Nucleation, growth and transformation of amorphous and crystalline solids condensing from the gas phase Nucleation, growth and transformation of amorphous and crystalline solids condensing from the gas phase

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..65..129k&link_type=abstract

(Lunar and Planetary Institute, Workshop on Thermodynamics and Kinetics of Dust Formation in the Space Medium, Houston, Tex., Se

Astronomy and Astrophysics

Astrophysics

9

Amorphous Materials, Condensation, Crystal Growth, Nucleation, Phase Transformations, Space Processing, Gas-Solid Interfaces, Germanium, Plasma Spraying, Space Commercialization, Technology Assessment, Thin Films

Scientific paper

The condensation of solids was investigated from the initial stage through continuous film growth, using evaporation and high-energy ion-beam sputtering. Consideration is given to germanium condensing on a variety of amorphous and crystalline substrates. Nucleation parameters, such as the activation energies of surface diffusion and adsorption and the critical nucleus size, were determined using an atomistic model for nucleation. Two flux and temperature dependent structural-order transitions were observed in the initial nucleation stages and found to coincide with corresponding transitions in the critical nucleus size. Correlation was also established between these transitions and two structural transitions occurring during continuous film growth. All results were distinctly affected by the vapor state of the adsorbates, implying considerable correlation between condensation on solid surfaces and in a vapor.

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