2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 7: Ionic Liquids & Energy Production
| Editors: | Kongoli F, Gaune-Escard M, Mauntz M, Rubinstein J, Dodds H.L. |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 310 pages |
| ISBN: | 978-1-987820-30-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Thermodynamic Properties of Bi2O3-P2O5-SiO2 Melts: Mass Spectrometric Study and Modeling
Valentina Stolyarova1; Andrei Shilov1; Sergey Lopatin1; Sergey Shugurov1;1SAINT PETERSBURG STATE UNIVERSITY, Saint Petersburg, Russian Federation;
Type of Paper: Regular
Id Paper: 298
Topic: 13
Abstract:
The ionic melts based on the Bi2O3-P2O5-SiO2 system are of interest for the glasses production as the materials with the unique combination of properties that may be used as photo resists, optical storage devices, holographic systems, optical waveguides, fiber-optic amplifiers and oscillators. The goal of this study is to obtain information on thermodynamic properties and vaporization processes of Bi2O3-P2O5-SiO2 melts at the temperature range 1400-1600 K that will be necessary for producing glasses with the properties required. Knudsen effusion mass spectrometric method was used to found the content of vapor, partial pressures of vapor species, activities of components and Gibbs energies in the melts under consideration. Vaporization of Bi2O3-P2O5-SiO2 melts was done from the molybdenum effusion cells covered by iridium. The negative deviations from the ideal behavior were observed in the melts studied. The generalized lattice theory was used for modeling thermodynamic properties of Bi2O3-P2O5-SiO2 melts and for the calculation of the relative numbers of chemical bonds formed in these melts when the second coordination spheres of atoms were taken into consideration. The financial support of the current study according to the project N 13-03-00718 by the Russian Fund for Basic Research is gratefully acknowledged.