Effect of water on the heat capacity of polymerized aluminosilicate glasses and melts

Computer Science

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

4

Scientific paper

The effect of water on heat capacity has been determined for four series of hydrated synthetic aluminosilicate glasses and supercooled liquids close to albite, phonolite, trachyte, and leucogranite compositions. Heat capacities were measured at atmospheric pressure by differential scanning calorimetry for water contents between 0 and 4.9 wt % from 300 K to about 100 K above the glass transition temperature (Tg). The partial molar heat capacity of water in polymerized aluminosilicate glasses, which can be considered as independent of composition, is =-122.319+341.631×10T+63.4426×10/T (J/mol K). In liquids containing at least 1 wt % H2O, the partial molar heat capacity of water is about 85 J/mol K. From speciation data, the effects of water as hydroxyl groups and as molecular water have tentatively been estimated, with partial molar heat capacities of 153 ± 18 and 41 ± 14 J/mol K, respectively. In all cases, water strongly increases the configurational heat capacity at Tg and exerts a marked depressing effect on Tg, in close agreement with the results of viscosity experiments on the same series of glasses. Consistent with the Adam and Gibbs theory of relaxation processes, the departure of the viscosity of hydrous melts from Arrhenian variations correlates with the magnitude of configurational heat capacities.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Effect of water on the heat capacity of polymerized aluminosilicate glasses and melts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Effect of water on the heat capacity of polymerized aluminosilicate glasses and melts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effect of water on the heat capacity of polymerized aluminosilicate glasses and melts will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1490179

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.