Surface Tensions and Densities of Molten Al2O3, Ti2O3, V2O5 and Nb2O5.

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Surface tensions and densities of molten Al2O3, Ti2O3, V2O5 and Nb2O5 were determined accurately by the maximum bubble pressure method. The measurements were carried out under Ar+10%H2 for molten Al2O3 and Ti2O3, and under air for molten V2O5 and Nb2O5. Surface tension and density of molten Al2O3 near the melting point are 606±6 mN m-1 and 3.06±0.03×103 kg m-3, and those of molten Ti2O3 are 584±5 mN m-1 and 3.91±0.03×103 kg m-3, respectively. The temperature coefficient of surface tension of molten V2O5 is slightly positive value of 0.0111 mN m-1 K-1, while for molten Nb2O5 it is negative value of -0.0596 mN m-1 K-1. This suggests that the network structure of molten V2O5 changes with temperature. The temperature coefficient of density of molten V2O5 is very low. The results are discussed in comparison with those of other molten pure oxides and fluorides having high melting points.