Signature of a polyamorphic transition in the THz spectrum of vitreous GeO2 - Tout INSP
Article Dans Une Revue Scientific Reports Année : 2015

Signature of a polyamorphic transition in the THz spectrum of vitreous GeO2

Résumé

The THz spectrum of density fluctuations, S(Q, ω), of vitreous GeO2 at ambient temperature wasmeasured by inelastic x-ray scattering from ambient pressure up to pressures well beyond that ofthe known α-quartz to rutile polyamorphic (PA) transition. We observe significant differences in thespectral shape measured below and above the PA transition, in particular, in the 30–80 meV range.Guided by first-principle lattice dynamics calculations, we interpret the changes in the phonondispersion as the evolution from a quartz-like to a rutile-like coordination. Notably, such a crossoveris accompanied by a cusp-like behavior in the pressure dependence of the elastic response of thesystem. Overall, the presented results highlight the complex fingerprint of PA phenomena on thehigh-frequency phonon dispersion.
Fichier principal
Vignette du fichier
main.pdf (914.68 Ko) Télécharger le fichier
Origine Publication financée par une institution

Dates et versions

hal-01216568 , version 1 (06-01-2025)

Licence

Identifiants

Citer

Alessandro Cunsolo, Yan Li, Chaminda N. Kodituwakku, Shibing Wang, Daniele Antonangeli, et al.. Signature of a polyamorphic transition in the THz spectrum of vitreous GeO2. Scientific Reports, 2015, 5, pp.2015. ⟨10.1038/srep14996⟩. ⟨hal-01216568⟩
487 Consultations
0 Téléchargements

Altmetric

Partager

More