Basicity-Gibbs Free Energy Relationships for Binary Alkali Silicates

Ovidiu Dumitrescu; Dorel Radu

doi:10.4028/www.scientific.net/AMR.39-40.169

Paper Titles

Glass Property Databases: Their History, Present State, and Prospects for Further Development
p.147

Properties of Silica Glass Doped with Titanium Oxide
p.153

Raman Spectroscopic and DTA Studies of TeO₂-ZnO-Na₂O Tellurite Glasses
p.159

Stress Strain Testing of the Strand of E-Glass Fibers
p.165

Basicity-Gibbs Free Energy Relationships for Binary Alkali Silicates
p.169

Structure and Properties of Selected Zirconia Silicate Glasses
p.173

Thermal Stability and Microstructure of Glasses and Glass-Ceramics in the System La₂O₃-PbO-MnO-B₂O₃
p.177

Study of Lithium-Lead Phosphate and Borophosphate Glasses
p.181

Some Physical Properties of Li₂O-TiO₂-TeO₂ and BaO-TiO₂-TeO₂ Glasses
p.185

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 39-40Basicity-Gibbs Free Energy Relationships for...

Basicity-Gibbs Free Energy Relationships for Binary Alkali Silicates

Abstract:

In present paper there are presented such correlations for the silica-alkali systems (M2O – SiO2) where reliable thermodynamic data exists from the thermal equilibrium diagrams. It was observed that with the saturation of SiO2 tetrahedron with metal ions, the difference in basicity between the reactants is diminished, in the order SiO2 → disilicate → metasilicate → orthosilicate, and that confirms the role of driving force for these reactions of the acid-base interaction between oxides and the intermediate silicates formed. Also, there were proposed some correlations between the standard formation Gibbs free energy, (Gº298), and basicity percentage, pB, for the binary compounds from the same oxide systems. Considering the fact that for a system at equilibrium, reaction constant Kp depends on the reaction free Gibbs energy (rG0 298) and temperature, a correlation between basicity difference through basicity percentage, pB, and rG0 298 is proposed.