In addition to the stable silica polymorph quartz, several metastable silica phases are present in Yucca Mountain. The conversion of these phases to quartz is accompanied by volume reduction and a decrease in the aqueous silica activity, which may destabilize clinoptilolite and mordenite. The primary reaction sequence for the silica phases is from opal or glass to disordered opal-CT, followed by ordering of the opal-CT and finally by the crystallization of quartz. The ordering of opal-CT takes place in the solid state, whereas the conversion of opal-CT takes place through dissolution-reprecipitation involving the aqueous phase. It is proposed that the rate of conversion of opal-CT to quartz is controlled by diffusion of defects out of a dis...
A comprehensive theory for quartz cementation must account for variations in the abundance and morph...
At subsurface conditions, stable modification of silica is believed to be α-quartz [1]. The results ...
The formation of metastable crystalline phases in lithium disilicate glass has been a subject of con...
A~TRACT: The diagenetic sequen ~ of silica is examined in terms of several thermodynamic and kinetic...
The largely debated silica polymorphism has in this thesis been investigated for the transformation ...
Part 1, ``The Preparation of Clinoptilolite, Mordenite and Analcime,`` summarized progress made duri...
International audienceThe kinetics of the quartz-coesite phase transition has been studied in situ b...
Different quartz types are used as raw material for silicon and ferrosilicon production. Upon heatin...
simulation Dissolution and precipitation of silica polymorphs (amorphous silica, cristobalite and qu...
International audienceMelting experiments on fluorphlogopite + quartz pairs have been performed at I...
The dissolution and precipitation of silica minerals in rocks, soils, and sediments are essential pr...
Present models for dissolution of silicate minerals and glasses, based on transition-state theory (T...
Cristobalite is a common silica polymorph in ceramics, as it can crystallize in SiO2-rich systems du...
Interfacial reaction between quartz and potassium silicate glass was studied at both 900 °C and 1000...
Transitions in petrified wood samples from several Thailand-Myanmar sites included opal-A to opal-CT...
A comprehensive theory for quartz cementation must account for variations in the abundance and morph...
At subsurface conditions, stable modification of silica is believed to be α-quartz [1]. The results ...
The formation of metastable crystalline phases in lithium disilicate glass has been a subject of con...
A~TRACT: The diagenetic sequen ~ of silica is examined in terms of several thermodynamic and kinetic...
The largely debated silica polymorphism has in this thesis been investigated for the transformation ...
Part 1, ``The Preparation of Clinoptilolite, Mordenite and Analcime,`` summarized progress made duri...
International audienceThe kinetics of the quartz-coesite phase transition has been studied in situ b...
Different quartz types are used as raw material for silicon and ferrosilicon production. Upon heatin...
simulation Dissolution and precipitation of silica polymorphs (amorphous silica, cristobalite and qu...
International audienceMelting experiments on fluorphlogopite + quartz pairs have been performed at I...
The dissolution and precipitation of silica minerals in rocks, soils, and sediments are essential pr...
Present models for dissolution of silicate minerals and glasses, based on transition-state theory (T...
Cristobalite is a common silica polymorph in ceramics, as it can crystallize in SiO2-rich systems du...
Interfacial reaction between quartz and potassium silicate glass was studied at both 900 °C and 1000...
Transitions in petrified wood samples from several Thailand-Myanmar sites included opal-A to opal-CT...
A comprehensive theory for quartz cementation must account for variations in the abundance and morph...
At subsurface conditions, stable modification of silica is believed to be α-quartz [1]. The results ...
The formation of metastable crystalline phases in lithium disilicate glass has been a subject of con...