Highhyphen;pressure phases of SiO2made in air by Fedoseevndash;Derjaguin laser process

摘要

Exposure of a falling stream of 1 mgr;m average size agr;hyphen;quartz particles to a continuous wave or pulsed CO2laser beam in air resulted in the formation of a complete series of highhyphen;pressure phases of silica: coesite, stishovite, and apparently even denser forms with agr;hyphen;PbO2and 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.