The densities of Sb and Bi melts were investigated by an improved Archimedean method. The results show that the density of the Sb melt decreases linearly with increasing temperature, but the density of the Bi melt firstly increases and then decreases as the temperature increases. There is a maximum density value of $\pu{10.002 g/cm^3}$ at 310 ℃ ,about 39 ℃ above the melting point. The temperature dependence of the Sb melt is well fitted with the expression $\pu{ρ = 6.8590 - 5.8105 × 10^{-4} T}$ , and that of the Bi melt is fitted with $\ce{ρ
= 10.3312 - 1.18 ×10^{-3} T}$.
![enter image description here](https://cdn.statically.io/img/i.sstatic.net/o5MpV.png)
Source: Geng, Haoran & Sun, Chunjing & Wang, Rui & Qi, Xiaogang & Zhang, Ning. (2007). Temperature dependence of densities of Sb and Bi melts. Chinese Science Bulletin. 52. 2031-2034. DOI: 10.1007/s11434-007-0309-7
Also see:
- Greenberg, Y. & Yahel, Eyal & Caspi, E. & Benmore, Chris & Beuneu, B. & Dariel, M.P. & Makov, Guy. (2009). Evidence for a temperature-driven structural transformation in liquid bismuth. EPL (Europhysics Letters). 86. 36004. DOI: 10.1209/0295-5075/86/36004.
- Tournier, R.F. Multiple Glass Transitions in Bismuth and Tin beyond Melting Temperatures. Metals 2022, 12, 2085. DOI: 10.3390/met12122085