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Emergence of crystal-like atomic dynamics in glasses at the nanometre scale (Articolo in rivista)

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Emergence of crystal-like atomic dynamics in glasses at the nanometre scale (Articolo in rivista) (literal)

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G. Baldi 1, M. Zanatta 2, E. Gilioli 1, V. Milman 3, K. Refson 4, B.Wehinger 5, B.Winkler 6, A. Fontana 7,8, and G. Monaco 5,7 (2013)
Emergence of crystal-like atomic dynamics in glasses at the nanometre scale
in Physical review letters; APS, American physical society, College Park, MD (Stati Uniti d'America)
(literal)

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G. Baldi 1, M. Zanatta 2, E. Gilioli 1, V. Milman 3, K. Refson 4, B.Wehinger 5, B.Winkler 6, A. Fontana 7,8, and G. Monaco 5,7 (literal)

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1 CNR-IMEM Institute, Parma Science Park, I-43124 Parma, Italy; 2 Physics Department, Perugia University, I-06123 Perugia, Italy; 3 Accelrys, 334 Cambridge Science Park, Cambridge CB4 0WN, United Kingdom; 4 STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom; 5 European Synchrotron Radiation Facility, BP220, F-38043 Grenoble, France; 6 Geowissenschaften, Goethe-Universität, D-60438 Frankfurt a.M., Germany; 7 Physics Department, Trento University, I-38123 Povo, Trento, Italy; 8 CNR-IPCF, UOS of Roma, c/o Roma University \"La Sapienza,\" I-00185 Roma, Italy (literal)

Titolo

Emergence of crystal-like atomic dynamics in glasses at the nanometre scale (literal)

Abstract

The vibrational dynamics of a permanently densified silica glass is compared to the one of an ?-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 ? 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 ? ?=2?. (literal)

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