Observations of the formation and propagation of a laser-driven strong shock in fused and {α}-quartz reveal anomalously high, transient shock velocities. These results disagree with calculations based on equilibrium equations of state. It is conjectured that at the shock front, a transformation of quartz to stishovite is preceded by shock-induced disorder accompanied by a significant entropy increase. This state remains dominant until sufficient relaxation has occurred.
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Ng et al. (1991) studied this question.
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