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- W3091543627 abstract "The anisotropic glass of 12.5Li2O-12.5Na2O-12.5K2O-12.5Cs2O-50P2O5 (mol%) shows significant shrinkage during relaxation to an isotropic structure. To clarify the relaxation mechanism, the change in storage modulus (Eˊ) and structure for isotropic and anisotropic glasses was investigated in temperatures ranging from room temperature to above the glass transition temperature (Tg.). The Eˊ for the isotropic glass gradually decreased with increasing temperature. On the other hand, the anisotropic glass showed a marked decrease in the Eˊ even below Tg, then increased, reaching the minimum around Tg, and finally reached the value of the isotropic glass. Raman spectra for the anisotropic glass with increasing temperature showed that the bond strength between alkali cations and non-bridging oxygen, of some local structures in oriented -P-O-P- chains, rapidly weakened. These changes were accompanied by a decrease in O−-P-O− bond angle below Tg. Additionally, the number of these local structures increased with increasing temperature. This structural change led to deformation in the oriented chain and loss of directionality. The change became significant above Tg, and the highly oriented structure could not be maintained. This unique relaxation in the direction of the oriented chain produced the noticeable shrinkage of the anisotropic glass." @default.
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- W3091543627 date "2021-01-01" @default.
- W3091543627 modified "2023-09-26" @default.
- W3091543627 title "Relaxation of anisotropic alkali metaphosphate glass" @default.
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- W3091543627 doi "https://doi.org/10.1016/j.matlet.2020.128762" @default.
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