The correlation between the longitudinal elastic modulus c11 and tin valence state in Li2O–B2O3–SiO2 ternary glasses is investigated. Substitution of B2O3 for SiO2 increases the glass-transition temperature and c11 but decreases the melting temperature. 119Sn Mössbauer spectra show that the valence state of tin increased with increasing molten temperature, Tmolten, in air, and that it also affects the c11 value even though the 1.0 mol. % addition. The c11 values, whose error bars are governed by those of density, suggest that the addition of SnO2 increases c11 whereas SnO decreases. The relationship between Tmolten and the amount of Sn2+ suggests that the main factor affecting the tin valence state is oxygen, whose reactivity may correlate with the glass melt viscosity.

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