ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 44, (3) 91 - 97 (2000)


THERMODYNAMIC PROPERTIES OF SODIUM-CONTAINING GLASSFORMING OXIDE MELTS
 
Kozhina Elena L., Shultz Mikhail M.
 
Institute of Silicate Chemistry of the Russian Academy of Sciences, Odoevskogo, 24-2, St.-Petersburg 199155, Russia

Electro-motive force investigation of Na₂O-RaOb (R = P, Si, B, Ge) and Na₂O-Q₂O₃-SiO₂ (Q = B, Al), as well as Na₂O-ZnOP₂O₅ melts is carried out over a glassforming 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 results are discussed in terms of acid-base interaction in melt. Chemical structure of the melts is simulated from the ideal associated mixture model. On this basis an account for “germanate” and “borate anomalies” is proposed.


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