We have performed in situ time-resolved x-ray diffraction at $\simeq 100$ GPa on laser-shocked ${\mathrm{CaSiO}}_3$ glass to investigate the glass-to-crystal transition. At this extreme pressure, we observe the ultrafast crystallization of the ${\mathrm{CaSiO}}_3$ perovskite structure from the compressed amorphous phase, with a typical nucleation time of 1.69 $\pm$ 0.10 ns and a final grain size of $\approx 20$ nm. The grain size temporal evolution suggests a diffusion-controlled transformation. Moreover, the observed concomitant explosive grain growth together with the release wave arrival into shocked ${\mathrm{CaSiO}}_3$ also suggests a role of the release in the nucleation process.

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• Crystallization
• Nucleation
• Phase diagrams
• Phase transitions
• Amorphous materials
• Glasses
• Perovskites
• Pressure effects
• Pressure techniques
• X-ray diffraction