High-pressure phases of SiO2 made in air by Fedoseev–Derjaguin laser process

Alam, M.; DebRoy, T.; Roy, R.; Breval, E.
October 1988
Applied Physics Letters;10/31/1988, Vol. 53 Issue 18, p1687
Academic Journal
Exposure of a falling stream of 1 μm average size α-quartz particles to a continuous wave or pulsed CO2 laser beam in air resulted in the formation of a complete series of high-pressure phases of silica: coesite, stishovite, and apparently even denser forms with α-PbO2 and Fe2N structures. Since the laser exposure technique works with the carbon black to diamond transition, the technique is confirmed as a simple and generally applicable means to achieve the same effects as exposure to several hundred kilobars pressure.


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