Physicochemical model of sodium silicate melt and thermodynamics of Q n-species

The basis of a formed physicochemical model of sodium silicate melt is a conception about Q n-species (SiO 4 tetrahedron with different numbers of bridging and non-bridging oxygen atoms). A correction of modeling results according to high-temperature Raman spectroscopy data has allowed us to propose an amendment on thermodynamic properties of Q n-species. Obtained results permit to describe a structure and properties of a melt in the range of composition from pure SiO 2 up to sodium orthosilicate in temperature diapason from 700 up to 2000 K.