Topic
Tridymite
About: Tridymite is a research topic. Over the lifetime, 840 publications have been published within this topic receiving 14831 citations.
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23 Jan 2023
TL;DR: In this paper , an integrated experimental and thermodynamic modeling study has been used to characterize phase equilibria in the Pb-Fe-O-S-Si system, which involves the use of high-temperature equilibration, quenching, and electron probe X-ray microanalysis to overcome difficulties associated with high corrosive tendency of the condensed phases and high vaporization rates of Pb species specific to this system.
Abstract: Abstract An integrated experimental and thermodynamic modeling study has been used to characterize phase equilibria in the Pb-Fe-O-S-Si system. The experimental approach developed for investigation of this system, which involves the use of high-temperature equilibration, quenching, and electron probe X-ray microanalysis, has enabled to overcome difficulties associated with high corrosive tendency of the condensed phases and high vaporization rates of Pb species specific to this system. The study shows that systematic, accurate direct experimental measurements of the Pb, Fe, Si, and S concentrations in the coexisting phases in this system are now possible. The results obtained for the slag-matte-metal-tridymite phase equilibria at 1100 °C and 1200 °C appear to be the first systematic quantitative experimental data on phase compositions in equilibrium in the Pb-Fe-O-S-Si system. First systematic experimental measurements have also been undertaken for the gas-slag-matte-tridymite equilibria at p (SO 2 ) = 0.6 atm at 1200 °C. Thermodynamic calculations have been performed using the FactSage thermodynamic package. The experimental data have been used, along with other relevant measurements, to develop a self-consistent thermodynamic database that can be used for optimization of industrial processes.
2 citations
TL;DR: In this article , the effect of the sintering temperature of nanosilica particles on physical, mechanical, dielectric, and output voltage properties was investigated. But, the results of the experiment were limited to 2 hours in an air-conditioned environment, and the results showed that the highest bulk density and the relative density of 2.49 ± 0.03 g/cm3 were achieved at a sintering temperature of 1390°C.
2 citations
TL;DR: In this article, a simple method to form single-crystal silica nanotubes in a low relative temperature was reported, which was obtained by pregained amorphous silica nano-notubes heated to 471 K for 5h in the presence of glycol and potassium hydroxide.
Abstract: A simple method to form single-crystal silica nanotubes in a low relative temperature is reported. A result of tridymite nanotubes in single-crystal structure, which was obtained by pregained amorphous silica nanotubes heated to 471 K for 5 h in the presence of glycol and potassium hydroxide is described. The results of XRD and TEM reveal that single-crystal tridymite nanotube was prepared.
2 citations
TL;DR: In this paper, the carminic acid stabilization in a silica matrix and the study of structural properties were dealt with, and the structural behavior was analyzed in function of temperature from RT to 900°C.
Abstract: This work deals with the carminic acid stabilization in a silica matrix and the study of structural properties. Results indicate that silica provides exceptional thermal stability to the carminic dye because its functional properties remain without significant changes up to 500 °C. The embedded carminic acid changes the crystallization behavior of silica. The carminic acid extracted from Mexican cochineal was firstly stabilized with sucrose and after embedded in a silica matrix using the sol-gel method. The structural behavior was analyzed in function of temperature from RT to 900 °C. The resulting properties were studied using X-ray diffraction and FT-IR spectroscopy. Interaction of carminic acid with silica reduces the formation temperature of tridymite and cristobalite. Amorphous tridymite was detected at 400 °C, semicrystalline tridymite at 700 °C, α-cristobalite at 800 °C, and β-cristobalite at 900 °C. The improved stability of carminic acid results from its interaction with the silica, which also modifies the silica crystallization kinetics.
2 citations
27 Aug 2002
TL;DR: In this paper, a float-glass-type composition region with 72.7 to 74.5 degrees C was measured for a floatglass-like composition region, and partial specific TLs were obtained from the data and compared with the literature.
Abstract: Liquidus temperature (TL) was measured for a float-glass-type composition region with 72.7 to 74.0 mass% SiO2, 0.1 to 0.54 mass% Al2O3, 8.0 to 9.0 mass% CaO, 3.0 to 4.0 mass% MgO, and 13.1 to 14.2 mass% Na2O. Crystalline phases were identified at 900?C as cristobalite, wollastonite and devitrite. The primary phases were tridymite and wollastonite. Partial specific TLs were obtained from the data and compared with the literature.
2 citations