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Structural heterogeneity and pressure-relaxation in compressed borosilicate glasses by in situ small angle X-ray scattering.
MedLine Citation:
PMID:  21639451     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
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 p(f) = 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.
Authors:
S Reibstein; L Wondraczek; D de Ligny; Sebastian Krolikowski; S Sirotkin; J-P Simon; V Martinez; B Champagnon
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of chemical physics     Volume:  134     ISSN:  1089-7690     ISO Abbreviation:  J Chem Phys     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-06-06     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375360     Medline TA:  J Chem Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  204502     Citation Subset:  IM    
Affiliation:
Department of Material Science, Glass and Ceramics-WW3, University of Erlangen-Nuremberg, Martensstraße 5, 91058 Erlangen, GermanyLaboratoire de Physico-Chimie des Matériaux Luminescents, Université Claude Bernard Lyon 1, UMR 5620 CNRS, 69622 Villeurbanne, FranceLaboratoire de Science et Ingénierie des Matériaux et Procédés, Université Joseph Fourier, UMR 5266 CNRS, 38402 St. Martin d́Hérès, France.
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