Hemispherical total emissivity and specific heat capacity of deeply undercooled Zr sub 41.2 Ti sub 13.8 Cu sub 12.5 Ni sub 10.0 Be sub 22.5 melts

High-temperature high-vacuum electrostatic levitation (HTHVESL) and differential scanning calorimetry (DSC) were combined to determine the hemispherical total emissivity epsilon sub T , and the specific heat capacity c sub p , of the undercooled liquid and throughout the glass transition of the Zr sub 412 Ti sub 13.8 Cu sub 12.5 Ni sub 10.0 Be sub 22.5 bulk metallic glass forming alloy. The ratio of c sub p / epsilon sub T as a function of undercooling was determining from radiative cooling curves measured in the HTHVESL. Using specific heat capacity data obtained by DSC investigations close to the glass transition and above the melting point, epsilon sub T and c sub p were separated and the specific heat capacity of the whole undercooled liquid region was determined. Furthermore, the hemispherical total emissivity of the liquid was found to be approx0.22 at 980K. On undercooling the liquid, the emissivity decreases to approx0.18 at approx670K, where the undercooled liquid starts to freeze to a glass. No significant changes of the emissivity are observed as the alloy undergoes the glass transition.