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Updated: Oct 3, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Direct observation of amorphous to amorphous apparently first-order phase transition in fused quartz
G D Mukherjee1, S N Vaidya, V Sugandhi
1High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
Abstract:
We report for the first time the direct observation of an apparently first-order phase transition in amorphous silica from the low density amorphous phase to the high density amorphous phase with a discontinuous volume change of about 20% from the dilatometric measurements using the piston cylinder apparatus at 36 kbar and 680 degrees C. Our Raman spectroscopy measurements on the retrieved samples quenched from high pressure and high temperature experiments do not show any Raman peaks indicating a large modification in the intermediate range order in the structure of amorphous silica.
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