THE SOLUBILITY OF QUARTZ IN H2O IN THE RANGE 1000-4000 BARS AND 400-550C,

Abstract

The solubility of quartz in H2O has been measured between 1-4 kilobars at 400, 450, 500, and 550 C. Two rate studies at 400 and 625 C are consistent with an equation of the form dx/dt = a-bx for the rate of solution of quartz in H2O, where x is the concentration of SiO2 in solution at time t. The temperature dependence of the two specific rate constants, a and b, give values of approximately 16.5 and 14.5 kcal/mole for the activation energies of the dissolution and crystallization processes respectively. The temperature and pressure dependence of solubility used in conjunction with the most widely accepted reaction for the solution of quartz, SiO2 (qtz) + 2H2O reversibly yields Si (OH)4, lead to thermodynamic calculations indicating unreasonable behavior of the assumed solute species. It is suggested that these anomalies may reflect the inability of the accepted solution reaction to represent the heterogeneous equilibrium between quartz and solution over a large range of temperature and pressure. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jul 07, 1964
Accession Number
AD0606185

Entities

Organizations

  • University of California, Berkeley

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Arrhenius Equation
  • Chemical Reaction Properties
  • Critical Temperature
  • Crystallization
  • Energy
  • Equations
  • Equations Of State
  • Glass Transition Temperature
  • Heat Of Activation
  • Mathematics
  • Mixtures
  • Solubility
  • Solutes
  • Transition Temperature

Readers

  • Materials Science and Engineering.
  • Regression Analysis.
  • Thin Film Deposition Science.