Structural heterogeneity and pressure-relaxation in compressed borosilicate glasses by in situ small angle X-ray scattering - Archive ouverte HAL Access content directly
Journal Articles The Journal of Chemical Physics Year : 2011

Structural heterogeneity and pressure-relaxation in compressed borosilicate glasses by in situ small angle X-ray scattering

Abstract

We report on Brillouin and in situ small angle X-ray scattering (SAXS) analyses of topological heterogeneity in compressed sodium borosilicate glasses. SAXS intensity extrapolated to very low angular regimes, I(q = 0), is related to compressibility. From Brillouin scattering and analyses of the elastic properties of the glass, the Landau-Placzek ratio is determined and taken as a direct reflection of the amplitude of frozen-in density fluctuations. It is demonstrated that with increasing fictive pressure, topological (mid- and long-range) homogeneity of the glass increases significantly. Heating and cooling as well as isothermal scans were performed to follow the evolution of density fluctuations upon pressure recovery. For a sample with a fictive pressure p(f) of 470 MPa, complete recovery to pf = 0.1 MPa was observed to occur close to the glass transition temperature. The values of fictive and apparent fictive temperature, respectively, as obtained via the intersection method from plots of I(q = 0) vs. temperature were found in good agreement with previous calorimetric analyses. Isothermal scans suggest that mid- and long-range recovery govern macroscopic density relaxation. (C) 2011 American Institute of Physics. [doi:10.1063/1.3593399]

Dates and versions

hal-00640051 , version 1 (10-11-2011)

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Cite

S. Reibstein, L. Wondraczek, D. de Ligny, S. Krolikowski, S. Sirotkin, et al.. Structural heterogeneity and pressure-relaxation in compressed borosilicate glasses by in situ small angle X-ray scattering. The Journal of Chemical Physics, 2011, 134 (20), ⟨10.1063/1.3593399⟩. ⟨hal-00640051⟩
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