Retarded elasticity in B2O3GeO2 glasses |
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Authors: | S. Suzuki M. Takahashi T. Kobayashi M. Imaoka |
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Affiliation: | Ceramic Engineering Research Laboratory, Nagoya Institute of Technology, 10-6, Asahigaoka, Tajimi-shi 507, Japan;Institute of Industrial Science, University of Tokyo, 7-22-1, Roppongi, Minato-ku 106, Japan |
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Abstract: | The retarded elasticity was investigated for B2O3GeO2 glasses having network structure in the glass transition range by using a compressive method. The compliance (J∞) determined at the final stage of each measurement displayed a maximum for roughly constant viscosity (η ? 1014 P) in all the B2O3GeO2 glasses and was simulated by the same equation applied for AsS glasses reported in a previous paper [1]. , where are parameters and ηG is the viscosity related to the retarded elasticity. The terms (k1/η) and (nk1/η) are assumed to be equal to one for all their values exceeding one. For B2O3GeO2 glasses, the deformation due to the retarded elasticity could be alloted to two structural elements: the first element related to the term and the second element related to the term . The values of showed almost no variance with the glass composition, but had a minimum at the composition of 50 mol% GeO2. These data suggest that the contribution of the second element is the smallest at B2O3/GeO2 = 1. The values of k2 were close to that of As2S3 glass having the network structure. k1 and n (or nk1) were almost constant regardless of the composition, respectively. These data suggest that the inhibition due to the viscosity starts at an approximately constant viscosity in B2O3GeO2 glasses. |
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