Measurements of thermophysical properties of molten silicon by a high-temperature electrostatic levitator
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Several thermophysical properties of molten silicon measured by the high-temperature electrostatic levitator at JPL are presented. They are density, constant-pressure specific heat capacity, hemispherical total emissivity, and surface tension. Over the temperature range investigated (1350<Tm<1825 K), the measured liquid density (in g·cm−3) can be expressed by a quadratic function,p(T)=pm−1.69×10−4(T−Tm)−1.75×10−7(T−Tm)2 withTm andpm being 1687 K and 2.56 g·cm−3, respectively. The hemispherical total emissivity of molten silicon at the melting temperature was determined to be 0.18, and the constant-pressure specific heat was evaluated as a function of temperature. The surface tension (in 10−3 N·m−1) of molten silicon over a similar temperature range can be expressed by σ(T)=875–0.22(T−Tm).
Key Wordsdensity electrostatic levitation hemispherical total emissivity molten silicon specific heat surface tension
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