Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 20, Pages 4629-4632Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4629
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Molecular simulations predict that a first-order amorphous-amorphous transformation occurs in SiO2 under pressure, analogous to the first-order amorphous-amorphous transformation known to occur in H2O. At low temperatures the first-order transformation is kinetically hindered, and an amorphous-amorphous transformation occurs instead by gradual spinodal decomposition at higher pressures. We suggest that previous experiments have observed the spinodal decomposition pathway in SiO2 and that the predicted first-order transformation will be observed in experiments carried out at higher temperatures.
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