TITLE:
Vaporization and Thermodynamics of Glass-Forming Oxide Melts: Mass Spectrometric Study and Modeling
AUTHORS:
V. L. Stolyarova
KEYWORDS:
Glass-Forming Oxide Melts, Thermodynamics, Vaporization, High Temperature Mass Spectrometry
JOURNAL NAME:
Journal of Materials Science and Chemical Engineering,
Vol.3 No.7,
July
1,
2015
ABSTRACT: Information on the vaporization processes
and thermodynamic properties of glass-forming oxide melts in the systems MgO-B2O3-SiO2,
CaO-B2O3-SiO2, SrO-B2O3-SiO2, BaO-B2O3-SiO2, PbO-B2O3-SiO2, CdO-B2O3-SiO2,
ZnO-B2O3-SiO2, Bi2O3-B2O3-SiO2 and Bi2O3-GeO2-SiO2 together with the earlier obtained
data is discussed. These data were obtained by high-temperature mass
spectrometric method. Various types of vapor species were found over oxide
systems studied such as the associated, dissociated and polymerized products of
vaporization. The regularities of the vaporization of the binary and
multicomponent glass-forming oxide melts were illustrated and discussed from
the point of view of the acid-base concept. Results on determination of
thermodynamic functions in oxide systems were considered taking into account
the main requirements for the confirmation of their reliability. The
generalized lattice theory of associated solutions was used for the calculation
of thermodynamic properties of the ternary silicate melts studied. Using this
approach the different levels of deviations from the ideality in the melts
under investigation were clarified. The relative numbers of bonds of various
types formed in the melts considered were also calculated based on the
generalized lattice theory of associated solutions.