Measurements of thermophysical properties of molten silicon by a high-temperature electrostatic levitator

Several thermophysical properties of molten silicon measured by the hightemperature electrostatic levitator at JPL are preseInted. They are density, constant- pressure specilic heat capacity, hemispherical total emissivity, and surface tension. Over the temperature range investigated (1350<7ʹ,,< 1825 K), the measured liquid density (in g.cm ~) can be expressed by a quadratic function, p(T) =p.,, - 1.69 x 10 ~( T- T,,,) - 1.75 x 10 7( T- T,,)-" with T,, and p,,~ being 1687 K and 2.56g-cm ~, respectively. The hemispherical total emissivity of molten silicon at the melting temperature was determined to be 0.18, and the constant-pressure specilic heat was evaluated as a function of temperature. The surface tension (in 10 ~ N-m-~) of molten silicon over a similar temperature range can be expressed by a(T) = 875 - 0.221 T- Tin).