Network properties of crystalline polymorphs of silica
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Crystallization of GeO<inf>2</inf> thin films into α-quartz: from spherulites to single crystals
2021, Acta MaterialiaCitation Excerpt :The challenge lies in the strong tendency of amorphization of silicon dioxide and the difficulty to control the nucleation and growth processes. It has been proved that the rigid network of SiO4 tetrahedra makes the solid state transformation of silica into quartz impossible unless some catalyst ions, so-called ‘network modifiers’ or ‘melting agents’, are added [8,13]. These melting agents are usually alkaline metals or alkaline earth metals, well known in the glass industry to lower the melting points of silicates to a more accessible temperature.
Effect of phosphate compound on physical and mechanical properties of SiO<inf>2</inf> ceramic
2019, Ceramics InternationalCitation Excerpt :This may be due to the limitation of Al(H2PO4)3 binder solution the breaking of the oxygen bond of α-quartz SiO2. Although the quartz-cristobalite transformation leads to a volume expansion, lowers density and influences on poor mechanical properties of SiO2 [2,6,12,17,49], the promotion of Al(H2PO4)3 binder solution on quartz-cristobalite transformation cannot decrease the compressive strength of the ceramics. This observation is inconsistent with the relationship between the cristobalite crystallization and mechanical properties that has been investigated previously [2,5,38,50].
Densification mechanisms of oxide glasses and melts
2018, Magmas Under Pressure: Advances in High-Pressure Experiments on Structure and Properties of MeltsFormation, migration, and clustering energies of interstitial He in α-quartz and β-cristobalite
2016, Journal of Nuclear MaterialsCitation Excerpt :In the former, the interstitial is 4-fold coordinated by Si atoms with equal distance to each. Following Marians and Hobbs [64,65], the atomic bonding topology of SiO2 networks may be described in terms of primitive rings. In the case of β-cristobalite, four 6-membered rings pass through every Si atom [37].
Ring compaction as a mechanism of densification in amorphous silica
2023, Physical Review B