溶融スズの表面張力の温度，酸素分圧依存性

抄録

The surface tension of molten tin has been determined by the sessile drop method at temperatures ranging from 523 to 1033 K and in the range of oxygen partial pressure, P_O2, from 2.85×10⁻¹⁹ to 8.56×10⁻⁶ MPa.
At P_O2=2.85×10⁻¹⁹ and 1.06×10⁻¹⁵ MPa, the surface tension of molten tin decreases linearly with increasing temperature and the temperature coefficients were (∂σ⁄∂T)_PO2=−0.151, −0.094 mN·m⁻¹·K⁻¹, respectively. At higher oxygen partial pressure (P_O2=3.17×10⁻¹⁰, 8.56×10⁻⁶ MPa), the surface tension increases with increasing temperature near the melting point (505 K). However, at temperatures ranging from 723 to 1033 K, the surface tension decreases with increasing temperature. Consequently, dependence of the surface tension decrease with P_O2 in the vicinity of the melting point is pretty large in comparison with that at temperatures ranging from 823 to 1023 K. The observed results were explained qualitatively based on a model proposed by Passerone et al.²¹⁾ which incorporates both thermodynamic and kinetic considerations.