混合アルカリ珪酸ガラスの混合エンタルピ

概要

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As an approach to the mixed alkali effect in glass, the heats of mixing in mixed alkali silicate glasses. R_2O-R'_2O-SiO_2 (R, R'=Li, Na, K: total alkali: 35mol%, 33.3mol% and 25 mol%), were measured at 25℃ by solution calorimetry. The densities of the glasses containing 35 mol% total alkali were also determined. The heats of mixing (AH) were negative except for the K_2O rich region. ΔH≒-1〜-2 kcal/mol SiO_2 The model proposed for the heats of mixing in fused salts mixtures containing a common anion was used for explanation of the mixed alkali effect in these glasses. In the mixed system, Li_2O-Na_2O, the calculated results by using the model were in general agreement with the experimental results. On the other hand, the mixed alkali effect could not be observed on the volume per mol SiO_2. It is concluded from these results that the interaction between unlike ions is a more important factor than the geometrical factor in explaining the mixed alkali effect.
社団法人日本材料学会の論文
1977-08-15