An optimized set of thermodynamic functions for the K 2 O-SiO 2 system at 10 5 Pa pressure was obtained by considering available phase diagram and thermodynamic data. KSi 0.25 O and SiO 2 were selected as components for the liquid phase. With respect to these components, the highly non-...
scale structural changes at the initial stages of phase separa- tion and crystallization. We attempted to obtain glasses with the compositions (100 – x)KNbO 3 –xSiO 2 (where x varies from 35 to 0), which we denote as KNS-x. The position of ...
Available thermodynamic and phase diagram data have been evaluated for all phases in the Na2O-SiO2 and K2O-SiO2 systems at 1 bar pressure from 298 K to above the liq-uidus temperatures. All reliable thermodynamic and phase diagram data have been simultaneously optimized in order to obtain one ...
K2O-SiO2Thermodynamic optimizationPhase diagramThermal analysisSealed Pt capsuleKey phase diagram experiments and thermodynamic opJournal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy ...
Key phase diagram experiments were conducted to reveal the phase diagram of the KO-MgO system using thermal analysis and equilibration techniques with sealed platinum capsules. The peritectic reaction of liquid + MgO → KMgOwas determined at 1131 K ± 14 K (858 °C ± 14 °C) for the ...
The experimental results are visualized in a phase diagram (Fig. 2). The most important equilibrium, annite+muscovite+3 quartz=garnet+2 sanidine+2 H2O has been treated thermdynamically. The heat of reaction is about 49 kcal. Based upon this value, the heat of formation for almandite garnet...
Phase diagramSlagExperimental data of solid-liquid phase equilibria in the K2O-CaO-SiO2 systems vital for many technologies and industrial applications are very limited and even not available at some primary phase fields. In the present study, by using Equilibration-Quenching-Phase compositional ...
phase diagramconsolute temperaturephase separationsubliquidus miscibility gapK 2O-B 2O 3-SiO 2The subliquidus miscibility gap in the system K 2 O-B 2 O 3 -SiO 2 has been determined for compositions with molar ratios SiO 2 /B 2 O 3 <2 and T≥550°C. The shape of the miscibility ...
The singularities give rise to a number of intriguing phase diagram features, including azeotropes. From the results presented here, it is predicted that the occurrence of margarite and paragonite in pelitic rocks is controlled by equilibria related to the singularities. The presence of these white...
D. Phase equilibriaD. Thermodynamic propertiesThe global thermal behavior of some common ceramics is represented in the ternary diagram SiO 2–Al 2O 3–K 2O, in a zone where no experimental data are available. In this study, we experimented the thermal transformations of compounds belonging to...