Hemispherical total emissivity and specific heat capacity of deeply undercooled Zr_41.2Ti_13.8Cu_12.5Ni_10.0Be _22.5 melts

High-temperature high-vacuum electrostatic levitation (HTHVESL) and differential scanning calorimetry (DSC) were combined to determine the hemispherical total emissivity ε_T, and the specific heat capacity c_p, of the undercooled liquid and throughout the glass transition of the Zr_41.2Ti_13.8Cu_12.5Ni_10.0Be _22.5 bulk metallic glass forming alloy. The ratio of c_p/ε_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, ε_T and c_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 about 0.22 at 980 K. On undercooling the liquid, the emissivity decreases to approximately 0.18 at about 670 K, 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.