Thermodynamic properties of sodium-containing glassforming oxide melts

Electro-motive force investigation of Na2O-RaOb (R = P, Si, B, Ge) and Na2O -Q(2)O(3)-SiO2 (Q = B, Al), as well as Na2O-ZnO-P2O5 melts is carried out o ver a glass forming range. Temperature range under study varies within the limits 800 - 1400 K depending on the system under consideration. A complete set of thermodynamic properties, both partial and integral, is calculated being referred to the corresponding properties of the pure oxides. The resu lts are discussed in terms of acid-base interaction in melt. Chemical struc ture of the melts is simulated from the ideal associated mixture model. On this basis an account for "germanate " and "borate anomalies " is proposed.