ラマン散乱スペクトルと化学平衡に基づくNa_2O-B_2O3-GeO_2系ガラスの構造と物性

概要

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Ota and co-workers determined a set of equilibrium constants Which govern the number density of the structural units in alkali borate glass. Based on the results, the molar volume of the system was computed. However, this technique can not be applied to the Na_2O-B_2O_3-GeO_2 System where the state analyses on Ge ions in the Na_2O-B_2O_3-GeO_2 system have not been fully conducted. In the present study a new method to calculate the molar volume of multi-component alkali borate system is presented. Raman spectra were used to elucidate that Na_2O affinity for B_2O_3 is stronger than that for GeO2. Assuming the relative magnitude of activity coefficient γ of Na_2O for B_2O_3 against for GeO_2 tentatively 1:2, the distribution of Na_2O among B_2O_3 and GeO_2 was determined. The molar volume of the Na_2O-B_2O_3-GeO_2 system was calculated from the partial molar volumes of the sub-systems Na_2O-B_2O_3 and Na_2O-GeO_2 in good agreement with the experimental value.
1997-06-15