Numerical simulation of alpha-quartz under non-hydrostatic compression. Memory glass and five-coordinated crystalline phases

Details Numerical simulation of alpha-quartz under non-hydrostatic compression. Memory glass and five-coordinated crystalline phases Numerical simulation of alpha-quartz under non-hydrostatic compression. Memory glass and five-coordinated crystalline phases

1996-01-23

arxiv.org/abs/cond-mat/9601100v1

Physics

Condensed Matter

Physical Review Letters, in press. 9 pages, uuencoded compressed postscript file

Scientific paper

10.1103/PhysRevLett.76.772

The behavior of $\alpha$-quartz under hydrostatic and non-hydrostatic high-pressure conditions has been investigated in Molecular Dynamics simulations of silica in order to clarify the role of non-hydrostatic stresses in the amorphization process. It is shown that the amorphization threshold is not modified if the stress along the {\bf c} direction is lowered, so that the mean amorphization pressure can effectively be lowered under non-hydrostatic conditions. On the other hand, the application of a positive uniaxial stress along the {\bf c} axis, results in the appearance of a new crystalline phase, where all silicon atoms are in five-fold coordination.

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