Abstract
We present the results of a simulation study of the effects of pressureon structural changes in silica glass. We observe structural relaxationsin glass under pressure that involve large atomic displacements and areaccompanied by breaking of the original bonds and forming of new ones.A large proportion of the new topological arrangements formed duringpressurizing are preserved in structures on decompression, resulting in theirreversibility of topological changes. Substantial rebonding makes themechanism of densification in glass essentially different from that present intransitions between crystalline silicas. We find that higher temperaturepromotes the degree of rebonding and densification in decompressed structure.
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