, Volume 21, Issue 2, pp 429-443

Thermophysical Properties of Molten Germanium Measured by a High-Temperature Electrostatic Levitator1

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Abstract

Thermophysical properties of molten germanium have been measured using the high-temperature electrostatic levitator at the Jet Propulsion Laboratory. Measured properties include the density, the thermal expansivity, the hemispherical total emissivity, the constant-pressure specific heat capacity, the surface tension, and the electrical resistivity. The measured density can be expressed by ρ liq=5.67×103−0.542 (TT m ) kg·m−3 from 1150 to 1400 K with T m=1211.3 K, the volume expansion coefficient by α=0.9656×10−4 K−1, and the hemispherical total emissivity at the melting temperature by ε T, liq(T m)=0.17. Assuming constant ε T, liq(T)=0.17 in the liquid range that has been investigated, the constant-pressure specific heat was evaluated as a function of temperature. The surface tension over the same temperature range can be expressed by σ(T)=583−0.08(TT m) mN·m−1 and the temperature dependence of the electrical resistivity, when r liq(T m)=60μμΩ·cm is used as a reference point, can be expressed by r e, liq(T)=60+1.18×10−2(T−1211.3)μΩ·cm. The thermal conductivity, which was determined from the resistivity data using the Wiedemann–Franz–Lorenz law, is given by κ liq(T )=49.43+2.90×10−2(TT m) W·m−1·K−1.