Internal Friction of (SiO2)1-x (GeO2)x Glasses

Abstract : Internal friction of (SiO2)1-x (GeO2)x glasses (x = 0, 5, 10, 24 and 100 mole%) is measured at temperatures between 1.6 and 280 K. The data are filted with the equations for thermally activated relaxation with distributing activation energies in symmetrical double-well potentials. From the determined relaxation strength spectra for each sample, the contributions from each type of microscopic structural units are calculated assuming that transverse motion of the bridging O atom in Si-O-Si, Si-O-Ge or Ge-O-Ge bridge (T model) is the microscopic unit responsible for relaxation. For instance, the magnitude of internal friction for SiO2-5% GeO2 or 24% GeO2 is calculated from the data of pure SiO2, SiO2-10% GeO2 and pure GeO2. The calculated results agree well with the measurements of SiO2-5% GeO2 and SiO2-24% GeO2. Thus T model is shown to be quantitalively consistent with internal friction of SiO2-GeO2 binary glasses.
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Submitted on : Monday, January 1, 1996 - 8:00:00 AM
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T. Kosugi, H. Kobayashi, Y. Kogure. Internal Friction of (SiO2)1-x (GeO2)x Glasses. Journal de Physique IV Colloque, 1996, 06 (C8), pp.C8-671-C8-674. ⟨10.1051/jp4:19968145⟩. ⟨jpa-00254578⟩

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