The vibrational dynamics of a permanently densified silica glass is compared to the one of an alpha-quartz polycrystal, the silica polymorph of the same density and local structure. The combined use of inelastic x-ray scattering experiments and ab initio numerical calculations provides compelling evidence of a transition, in the glass, from the isotropic elastic response at long wavelengths to a microscopic regime as the wavelength decreases below a characteristic length xi of a few nanometers, corresponding to about 20 interatomic distances. In the microscopic regime the glass vibrations closely resemble those of the polycrystal, with excitations related to the acoustic and optic modes of the crystal. A coherent description of the experimental results is obtained assuming that the elastic modulus of the glass presents spatial heterogeneities of an average size a similar to xi/2 pi
Emergence of crystal-like atomic dynamics in glasses at the nanometer scale / Baldi, Giacomo; Zanatta, Marco; Gilioli, E.; Milman, V.; Refson, K.; Wehinger, B.; Winkler, B.; Fontana, Aldo; Monaco, Giulio. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 110:18(2013), pp. 185503-1-185503-5. [10.1103/PhysRevLett.110.185503]
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Titolo: | Emergence of crystal-like atomic dynamics in glasses at the nanometer scale | |
Autori: | Baldi, Giacomo; Zanatta, Marco; Gilioli, E.; Milman, V.; Refson, K.; Wehinger, B.; Winkler, B.; Fontana, Aldo; Monaco, Giulio | |
Autori Unitn: | ||
Titolo del periodico: | PHYSICAL REVIEW LETTERS | |
Anno di pubblicazione: | 2013 | |
Numero e parte del fascicolo: | 18 | |
Codice identificativo Scopus: | 2-s2.0-84876999098 | |
Codice identificativo WOS: | WOS:000319019300009 | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevLett.110.185503 | |
Handle: | http://hdl.handle.net/11572/67811 | |
Citazione: | Emergence of crystal-like atomic dynamics in glasses at the nanometer scale / Baldi, Giacomo; Zanatta, Marco; Gilioli, E.; Milman, V.; Refson, K.; Wehinger, B.; Winkler, B.; Fontana, Aldo; Monaco, Giulio. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 110:18(2013), pp. 185503-1-185503-5. [10.1103/PhysRevLett.110.185503] | |
Appare nelle tipologie: | 03.1 Articolo su rivista (Journal article) |
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