Containerless Measurements of Density and Viscosity for a Cu $$_{48}$$ Zr $$_{52}$$ Liquid

The densities of solid and liquid Cu $$_{48}$$ Zr $$_{52}$$ and the viscosity of the liquid were measured in a containerless electrostatic levitation system using optical techniques. The measured density of the liquid at the liquidus temperature (1223 K) is (7.02 $$\pm $$ 0.01) g $$\cdot $$ cm $$^{-3}$$ and the density of the solid extrapolated to that temperature is (7.15 $$\pm $$ 0.01) g $$\cdot $$ cm $$^{-3}$$ . The thermal expansion coefficients measured at 1223 K are (6.4 $$\pm $$ 0.1) $$\,\times \,10^{-5}$$ K $$^{-1}$$ in the liquid phase and (3.5 $$\pm $$ 0.3) $$\,\times \,10^{-5}$$ K $$^{-1}$$ in the solid phase. The viscosity of the liquid, measured with the oscillating drop technique, is of the form $$A\exp \left[ \left( {{E}_{0}}+{{E}_{1}}\left( 1/T-1/{{T}_{0}} \right) \right) \times \left( 1/T-1/{{T}_{0}} \right) \right] $$ , where $${{T}_{0}}=1223$$ K, $$A= (0.0254 \pm 0.0004)$$ Pa $$\cdot $$ s, $${{E}_{0}}$$ =  (8.43 $$\pm $$ 0.26) $$\,\times \,10^3$$ K and $${{E}_{1}}$$ =  (1.7 $$\pm $$ 0.2) $$\,\times 10^7$$ K $$^{2}$$ .