THE EFFECT OF HIGH PRESSURE ON CRYSTALLIZATION KINETICS: FUSED SILICA.
Abstract
A thermodynamic theory is developed for the effect of pressure on the kinetics of phase transformations. The results suggest that application of pressure may have a profound effect in increasing the rate of crystal nucleation, but that its effect on growth rate should generally be a smaller inhibitory one. Observations on SiO2 carried out in a Bridgman-anvil high pressure device demonstrated the occurrence of crystallization under conditions of temperature and pressure where none had been anticipated from the kinetic formalism. A number of hypotheses are suggested to account for the observations, the most satisfactory of which is based on the effect of water, and the possible existence of a water-rich region at the interface at high pressure, in enhancing the extent of crystallization in a given time. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1966
- Accession Number
- AD0638140
Entities
People
- D. R. Uhlmann
- D. Turnbull
- J. F. Hays
Organizations
- Harvard University