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Title: In situ measurements of density fluctuations and compressibility in silica glasses as a function of temperature and thermal history

Abstract

In this paper, small-angle x-ray scattering measurements are used to determine the different compressibility contributions, as well as the isothermal compressibility {chi}{sub T}{sup 0} in thermal equilibrium in silica glasses having different thermal histories. Using two different methods of analysis, in the supercooled liquid and in the glassy state, we obtain, respectively, the temperature and fictive temperature dependences of {chi}{sub T}{sup 0}. The values obtained in the glass and supercooled liquid states are very close to each other. They agree with previous determinations of the literature. The compressibility in the glass state slightly decreases with increasing fictive temperature. The relaxational part of the compressibility is also calculated and compared to previous determinations. We discussed the small differences between the different determinations.

Authors:
; ; ; ; ;  [1];  [2];  [2];  [2];  [2]
  1. Laboratoire des Colloiedes, Verres et Nanomateriaux, CNRS/UMR5587, Universite Montpellier II, cc 69, 34095 Montpellier cedex (France)
  2. (France)
Publication Date:
OSTI Identifier:
20787754
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 72; Journal Issue: 22; Other Information: DOI: 10.1103/PhysRevB.72.224201; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; COMPRESSIBILITY; DENSITY; FLUCTUATIONS; GLASS; LIQUIDS; RELAXATION; SILICA; SILICON COMPOUNDS; SMALL ANGLE SCATTERING; TEMPERATURE DEPENDENCE; THERMAL EQUILIBRIUM; X-RAY DIFFRACTION

Citation Formats

Levelut, C., Faivre, A, Le Parc, R., Champagnon, B., Hazemann, J.-L., Simon, J.-P., Laboratoire de Physicochimie des Materiaux Luminescents, Universite Lyon 1, CNRS/UMR 5620, 69622 Villeurbanne Cedex, Laboratoire de Cristallographie, UPR 5031, 26 Avenue des Martyrs, Boite Postale 166, 38042 Grenoble CEDEX 9, LGIT, CNRS/UMR 5559, Universite Joseph Fourier, 38041 Saint Martin d'Heres, and Laboratoire de Thermodynamique et Physicochimie Metallurgiques, UMR 5614, INP et UJF Grenoble, Boite Postale 75, 38402 Saint Martin d'Heres. In situ measurements of density fluctuations and compressibility in silica glasses as a function of temperature and thermal history. United States: N. p., 2005. Web. doi:10.1103/PHYSREVB.72.2.
Levelut, C., Faivre, A, Le Parc, R., Champagnon, B., Hazemann, J.-L., Simon, J.-P., Laboratoire de Physicochimie des Materiaux Luminescents, Universite Lyon 1, CNRS/UMR 5620, 69622 Villeurbanne Cedex, Laboratoire de Cristallographie, UPR 5031, 26 Avenue des Martyrs, Boite Postale 166, 38042 Grenoble CEDEX 9, LGIT, CNRS/UMR 5559, Universite Joseph Fourier, 38041 Saint Martin d'Heres, & Laboratoire de Thermodynamique et Physicochimie Metallurgiques, UMR 5614, INP et UJF Grenoble, Boite Postale 75, 38402 Saint Martin d'Heres. In situ measurements of density fluctuations and compressibility in silica glasses as a function of temperature and thermal history. United States. doi:10.1103/PHYSREVB.72.2.
Levelut, C., Faivre, A, Le Parc, R., Champagnon, B., Hazemann, J.-L., Simon, J.-P., Laboratoire de Physicochimie des Materiaux Luminescents, Universite Lyon 1, CNRS/UMR 5620, 69622 Villeurbanne Cedex, Laboratoire de Cristallographie, UPR 5031, 26 Avenue des Martyrs, Boite Postale 166, 38042 Grenoble CEDEX 9, LGIT, CNRS/UMR 5559, Universite Joseph Fourier, 38041 Saint Martin d'Heres, and Laboratoire de Thermodynamique et Physicochimie Metallurgiques, UMR 5614, INP et UJF Grenoble, Boite Postale 75, 38402 Saint Martin d'Heres. Thu . "In situ measurements of density fluctuations and compressibility in silica glasses as a function of temperature and thermal history". United States. doi:10.1103/PHYSREVB.72.2.
@article{osti_20787754,
title = {In situ measurements of density fluctuations and compressibility in silica glasses as a function of temperature and thermal history},
author = {Levelut, C. and Faivre, A and Le Parc, R. and Champagnon, B. and Hazemann, J.-L. and Simon, J.-P. and Laboratoire de Physicochimie des Materiaux Luminescents, Universite Lyon 1, CNRS/UMR 5620, 69622 Villeurbanne Cedex and Laboratoire de Cristallographie, UPR 5031, 26 Avenue des Martyrs, Boite Postale 166, 38042 Grenoble CEDEX 9 and LGIT, CNRS/UMR 5559, Universite Joseph Fourier, 38041 Saint Martin d'Heres and Laboratoire de Thermodynamique et Physicochimie Metallurgiques, UMR 5614, INP et UJF Grenoble, Boite Postale 75, 38402 Saint Martin d'Heres},
abstractNote = {In this paper, small-angle x-ray scattering measurements are used to determine the different compressibility contributions, as well as the isothermal compressibility {chi}{sub T}{sup 0} in thermal equilibrium in silica glasses having different thermal histories. Using two different methods of analysis, in the supercooled liquid and in the glassy state, we obtain, respectively, the temperature and fictive temperature dependences of {chi}{sub T}{sup 0}. The values obtained in the glass and supercooled liquid states are very close to each other. They agree with previous determinations of the literature. The compressibility in the glass state slightly decreases with increasing fictive temperature. The relaxational part of the compressibility is also calculated and compared to previous determinations. We discussed the small differences between the different determinations.},
doi = {10.1103/PHYSREVB.72.2},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 22,
volume = 72,
place = {United States},
year = {Thu Dec 01 00:00:00 EST 2005},
month = {Thu Dec 01 00:00:00 EST 2005}
}
  • The stability of the {chi}{sup (2)} susceptibility induced in poled Infrasil{sup TM} silica glass samples is studied at room temperature. To this end, the second-order nonlinearity spatial distribution is determined as a function of the aging duration ranging from 0 (immediately after poling) to 14 months. An important decrease of the nonlinear layer width is observed although the {chi}{sup (2)} magnitude remains unaffected. The experimental results reported in this Letter suggest a movement of charges within the nonlinear region without recombination.
  • Fluorescence photobleaching is employed to obtain directly, and for the first time, diffusion coefficients and mobile fractions for naphthacene adsorbed on silica gel. The diffusion is slower than that estimated from bimolecular rate constants in comparable systems, and only about one-third to one-half of the molecules are mobile. The mobility parameters are studied as a function of the level of hydroxylation (chemisorbed water) and hydration (physisorbed water) of the silica gel controlled by appropriate heat treatments. The diffusion coefficient is independent of the preparation while the mobile fraction increases when the level of hydroxylation decreases and that of hydration ismore » increased. These trends are rationalized in terms of the surface heterogeneity and the number of hydrogen bonds formed between naphthacene and surface silanol groups.« less
  • The two-dimensional model of itinerant electrons coupled to an antiferromagnetic order parameter is considered. In the mean-field solution the Fermi surface undergoes reconstruction and breaks into disconnected 'pockets'. We have studied the effect of the thermal fluctuations of the order parameter on the spectral density in such system. These fluctuations lead to a finite width of the spectral line scaling linearly with temperature. Due to the thermal fluctuations the quasiparticle spectral weight is transferred into a magnetic Brillouin zone. This can be interpreted as restoration of 'arcs' of the noninteracting Fermi surface.
  • The two-dimensional model of itinerant electrons coupled to an antiferromagnetic order parameter is considered. In the mean-field solution the Fermi surface undergoes reconstruction and breaks into disconnected “pockets”. We have studied the effect of the thermal fluctuations of the order parameter on the spectral density in such system. These fluctuations lead to a finite width of the spectral line scaling linearly with temperature. Due to the thermal fluctuations the quasiparticle spectral weight is transferred into a magnetic Brillouin zone. This can be interpreted as restoration of “arcs” of the noninteracting Fermi surface.