1961
DOI: 10.1111/j.1151-2916.1961.tb15344.x
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Transformation of Quartz to Cristobalite

Abstract: Transformation of Quartz to Cristobalite 35 of obtaining an understanding of processes of this kind is by detailed microscopic studies. Observation of many microstructures leads one to the conclusion that a variety of different effects occur in different systems and that the definition of the terminal stages of sintering as a "coalescence" process is a gross oversimplification. V. Summary and ConclusionsExperimental observations of the sintering rate and resulting microstructures for a number of systems indica… Show more

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Cited by 70 publications
(28 citation statements)
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“…Schei and Halvorsen [26] defined x in Reaction [8] as carbon coverage. Reaction [8] indicates that when C/ SiO 2 molar ratio is less than a stoichiometric ratio of 3, silicon can be lost in the form of SiO(g) which is blown out of the reactor.…”
Section: Discussionmentioning
confidence: 99%
“…Schei and Halvorsen [26] defined x in Reaction [8] as carbon coverage. Reaction [8] indicates that when C/ SiO 2 molar ratio is less than a stoichiometric ratio of 3, silicon can be lost in the form of SiO(g) which is blown out of the reactor.…”
Section: Discussionmentioning
confidence: 99%
“…The transformation process of quartz into cristobalite takes place right up to 1923 K (1650°C). [20] The amorphous phase which was found in the quartz lumps heated to 1650°C (1923 K) is therefore not melted quartz, but rather the transitional intermediate phase which forms during the ''reconstructive transformation'' of b-quartz to b-cristobalite. [20,34,35] Also, quartz in pellets was completely transformed to cristobalite at 1650°C (1923 K).…”
Section: A Quartz Microstructure During Heatingmentioning
confidence: 99%
“…In general, small cations diffuse more easily, and voids, cracks and low density structures, such as hightemperature quartz polymorphs, enhance the cations' diffusion. [20,21] Geological studies on the diffusion of impurities during hydrothermal alteration of quartz show that Fe, [22,23] K [22,24,25] ' and B [25] are mobile ions in quartz. Fig.…”
mentioning
confidence: 99%
“…When sintering at high temperature, the volume of the silica will expand due to the phase transition. For the phase transition from ¡-quartz to ¢-cristobalite, 19) silica in drift sands has a lower transition temperature (1200°C) than pure silica (1470°C). It is mainly due to the cations in drift sands like Na…”
Section: Effects Of Drift Sands On the Phase Formations Of Ceramicsmentioning
confidence: 99%