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Vaporization Behavior and Thermodynamic Properties of K2O-GeO2 Melts Studied by Mass Spectrometry

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Abstract

The vaporization behavior and thermodynamic properties of K2O-GeO2 melts are studied by Knudsen cell mass spectrometry in the range 950–1550 K. The vapor composition over the melts indicates that their vaporization behavior is governed by reactions characteristic of oxides and is consistent with the general trends in other alkali oxide-glass-forming oxide melt systems. The thermodynamic data obtained for K2O-GeO2 melts using two independent approaches attest to significant deviations from ideality, characteristic of alkali glass-forming systems. The deviation from ideality increases in the order Na2O-SiO2 < Na2O-GeO2 < K2O-SiO2 < K2O-GeO2. The negative deviation from ideality also increases in going from silicates to germanates and in going from Na2O-(SiO2, GeO2) to K2O-(SiO2, GeO2). The composition dependences of the K2O and Na2O activities in the melt systems studied show a linear variation of loga, and the 1473-K values of a(Na2O) and a(K2O) in the silicate melts coincide. The approach described in this work—analysis of the entire set of partial and total thermodynamic functions of melt systems close in different properties—allows one to assess the accuracy and reliability of the output data.

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  1. Karpinskii All-Russia Research Institute of Geology, Srednii pr. 74, St. Petersburg, 199026, Russia

    S. I. Shornikov

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Translated from Neorganicheskie Materialy, Vol. 41, No. 12, 2005, pp. 1521–1533.

Original Russian Text Copyright © 2005 by Shornikov.

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Shornikov, S.I. Vaporization Behavior and Thermodynamic Properties of K2O-GeO2 Melts Studied by Mass Spectrometry. Inorg Mater 41, 1345–1356 (2005). https://doi.org/10.1007/s10789-005-0313-8

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