Density and excess volume of the liquid Ti–V system measured in electromagnetic levitation

Abstract The density of the liquid Ti–V system was systematically measured using the optical dilatometry method in electromagnetic levitation. Possible error sources have been discussed and minimized. A linear temperature dependency with negative slope of the density was found for all investigated alloys. Pure vanadium shows the highest density with$${\rho }_V\left(T\right)=5.55\pm 0.03{\mathrm{gcm}}^-3-6.01\pm 0.52 {10}^-4{\mathrm{gcm}}^-3{\mathrm{K}}^-1$$, pure titanium the lowest at$${\rho }_Ti\left(T\right)=4.21\pm 0.02{\mathrm{gcm}}^-3-3.46\pm 0.30 {10}^-4{\mathrm{gcm}}^-3{\mathrm{K}}^-1$$with every measured alloy ranging between these two extrema. The molar volume was utilized in order to interpret the compositional density dependency. No significant excess volume was evident. It was therefore shown that the Ti–V system acts like an ideal solution regarding density, molar volume and temperature coefficient. This result allows to reliably calculate the density for the complete Ti–V system at any given temperature.