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Journal Articles The Journal of Chemical Physics Year : 2019

Evidence of polyamorphic transitions during densified SiO2 glass annealing

Abstract

In situ X-ray scattering monitoring is carried out during temperature annealing on different densified SiO2 glasses. Density fluctuations and intermediate range coherence from X-ray scattering (small-angle X-ray scattering) and diffraction (wide angle X-ray scattering) evidence a maximum in their evolution at the same relaxation time. These extrema confirm the existence of an intermediate transitory disordered state between the two more ordered high and low density amorphous states. We propose that the existence of this transitory state confirms the existence of two mega basins in the energy landscape and therefore an amorphous-amorphous transition. Including older Raman results, we show that this intermediate disorder state implies similar mechanisms at all length scales from a few angstroms to 5 nm.
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Dates and versions

hal-02417220 , version 1 (18-12-2019)

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Antoine Cornet, Christine Martinet, Valérie Martinez, Dominique de Ligny. Evidence of polyamorphic transitions during densified SiO2 glass annealing. The Journal of Chemical Physics, 2019, 151 (16), pp.164502. ⟨10.1063/1.5121534⟩. ⟨hal-02417220⟩
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