Thermophysical Property Measurements of Supercooled and Liquid Rhodium

The density, the isobaric heat capacity, the surface tension, and the viscosity of liquid rhodium were measured over wide temperature ranges, including the supercooled phase, using an electrostatic levitation furnace. Over the 1820 to 2250 K temperature span, the density can be expressed as r(T)=10.82×103− 0.76(T−Tm) (kg ·m−3) with Tm=2236 K, yielding a volume expansion coefficient a(T)=7.0×10−5 (K−1). The isobaric heat capacity can be estimated as CP(T)=32.2+1.4×10−3(T−Tm) (J ·mol−1·K−1) if the hemispherical total emissivity of the liquid remains constant at 0.18 over the 1820 to 2250 K iInterval. The enthalpy and entropy of fusion have also been measured, respectively, as 23.0 kJ ·mol−1 and 10.3 J ·mol−1·K−1. In addition, the surface tension can be expressed as s(T)=1.94×103−0.30(T−Tm) (mN·m−1) and the viscosity as g(T)=0.09 exp[6.4×104(RT)] (mPa· s) over the 1860 to 2380 K temperature range.