International Journal of Thermophysics

, Volume 21, Issue 2, pp 429–443

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

  • W.-K. Rhim
  • T. Ishikawa

DOI: 10.1023/A:1006639714415

Cite this article as:
Rhim, WK. & Ishikawa, T. International Journal of Thermophysics (2000) 21: 429. doi:10.1023/A:1006639714415


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 ρliq=5.67×103−0.542 (TTm) kg·m−3 from 1150 to 1400 K with Tm=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 εT, liq(Tm)=0.17. Assuming constant εT, 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(TTm) mN·m−1 and the temperature dependence of the electrical resistivity, when rliq(Tm)=60μμΩ·cm is used as a reference point, can be expressed by re, 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 κliq(T )=49.43+2.90×10−2(TTm) W·m−1·K−1.

density electrical resistivity electrostatic levitator hemispherical total emissivity molten germanium specific heat surface tension thermal conductivity 

Copyright information

© Plenum Publishing Corporation 2000

Authors and Affiliations

  • W.-K. Rhim
    • 1
  • T. Ishikawa
    • 2
  1. 1.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadena
  2. 2.Space Utilization Research CenterNASDAIbarakiJapan