Spectral emissivity and constant pressure heat capacity of molten nickel and rhodium measured by spectrometers combined with an electrostatic levitator

Spectral emissivity and constant heat capacities of molten nickel and rhodium at their melting temperatures were measured using containerless techniques. Samples were levitated in an electrostatic levitator and the radiation intensities from the molten samples were measured with spectrometers over a wide wavelength range. The spectrometers were calibrated with a blackbody radiation furnace and the spectral hemispherical emissivity was calculated. The total hemispherical emissivity of nickel at the melting temperature calculated by integrating the spectral hemispherical emissivity was found to be 0.21, and the constant pressure heat capacity of molten nickel at the melting temperature was calculated to be 39.9 J·mol⁻¹·K⁻¹. The total hemispherical emissivity and the constant pressure heat capacity of rhodium at the melting temperature were measured to be 0.23 and 41.8 J·mol⁻¹·K⁻¹, respectively.