Surface Tension of Bi2O3-B2O3 Binary Glass Melts

概要

論文の詳細を見る
The surface tension in xBi2O3-(100-x)B2O3 (x=0∼100 mol%) binary melts has been measured by the ring method in the temperature range, 973 to 1373 K. The compositional dependence of surface tension has been investigated. The surface tension values of the phase-separated region (0∼20 mol%Bi2O3) were close to that for pure B2O3. Beyond this region the surface tension increased sharply with the increasing Bi2O3 content, showing a maximum at 70∼80 mol%Bi2O3, and then decreased with further addition of Bi2O3. The behaviour of surface tension was discussed on the basis of the Gibbs' adsorption rule and the ionic potential of bismuth ion. In the phase-separated region (0∼20 mol%Bi2O3), the temperature coefficient of surface tension in Bi2O3-B2O3 binary melts had the values of pure B2O3 with positive value. It changed from positive to negative in the range of 30 to 80 mol%Bi2O3, with the minimum value at 40 mol%Bi2O3 and decreased with further addition of Bi2O3 over 80 mol%Bi2O3. The temperature coefficient of surface tension was discussed in terms of the coordination number of boron in crystalline polymorphs and the volume expansion coefficient of the melt.
公益社団法人日本セラミックス協会の論文