Changes in Pervoural Quartzite Crystal Lattice on Heating from 25 to 600°C

Abkaryan, A. K.; Temnykh, V. I.; Кукарцев, В. В.; Tynchenko, V. S.; Kukartsev, A. V.

doi:10.1007/s11148-021-00577-6

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“…The initial transformation temperature also depends on the state of the silica, as the temperature can be relatively low (up to 900 • C) for silicic acid but much higher (up to 1200 • C) for rock crystal. This is also influenced by the impurities contained in the quartzite [37,38].…”

Section: Introductionmentioning

confidence: 99%

X-ray Diffraction Phase Analysis of Changes in the Lattice of Pervouralsk Quartzite upon Heating

et al. 2022

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At present, quartzite is widely used across many industries. The properties of quartzite significantly affect the technology used during the preparation of the raw materials as well as the technology used for manufacturing the final product, which may be intended for further operation at different temperatures. The purpose of the study was to create a scheme for the transformation of quartzite that would describe the changes in the parameters of its lattice parameter upon heating and would offer guidance regarding the drying technology and technology required to obtain tridymite. A Bruker D8 Advance diffractometer was used to study changes in the phase composition of quartzite at the temperatures of 200, 400, 600, 879, 1000, 1200, 1470, and 1550 °C. A detailed scheme of transformations of PKMVI-1 quartzite with a SiO2 content of at least 97.5% at normal pressure was proposed for crystalline modifications formed during its heating. As a result of this research, the changes in the parameters of the lattice parameter—such as the average interplanar distance davg, the volume of the unit cell Vavg, the density of the unit cell Davg, and the molecular weight Mavg—were established.

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Section: Introductionmentioning

confidence: 99%