Kazuichi Mizoguchi1, Masahiro Yamane1 and Yukio Suginohara1
1Department of Metallurgy, Kyushu Institute of Technology, Kitakyushu
The viscosities of CaO, MgO and Na2O-SiO2 systems containing Ga2O3 were measured and an ionic form of Ga3+ ions was discussed on the basis of the effect of Ga2O3 on the viscosities of the melts. For example, the viscosity changes with increasing additions of Ga2O3 in Na2O-SiO2 melts were almost same as those of Al2O3 in CaO-SiO2 melts. The results indicate that Ga2O3 plays as an amphoteric oxide as Al2O3 in silicate melts. The viscosities measured in this study were well arranged and the ratio of the number of tetrahedrally coordinated Ga3+ ions to that of total Ga3+ ions could be calculated using a following parameter (Pη ) which corresponds to the ratio of nO0/nSi in the binary silicate melts.
The parameter Pη is expressed by
viscosity, gallosilicate melts, parameter, amphoteric oxide, coordination of Ga3+ ion
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