Other
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..235n&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, Issue 2, pp.235-244
Other
2
Scientific paper
We propose that within PbO-SiO 2 melts the component species PbO(1) and SiO 2 (1) associate to form a lead orthosilicate complex [Pb 2 SiO 4 (1)] according to 2 PbO (1) + SiO 2 (1) á f Pb 2 SiO 4 (1) The association constant ( K ) for the above reaction is near 30 at 900 and 1000°C On the premises that the enthalpy of the above reaction is the only contributor to the enthalpy of mixing and that three melt species [PbO(1), SiO 2 (1), Pb 2 SiO 4 (1)] mix ideally (Raoult's Law obeyed), the partial molar properties and the integral mixing properties of the melt have been calculated and have been found to accurately reproduce the measured thermochemical data. The conductivity data and density data for PbO-SiO 2 melts have been calculated using the association model. The calculated data again are remarkably consistent with the experimental data. Other silicate-melt models have been reinterpreted and that of Toop and Samis is compatible with the proposed model. In fact the Toop and Samis model implicitly assumes the formation of orthosilicate species rather than condensed polymeric species.
Fleet Michael E.
Nesbitt Wayne H.
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