Thermophysical Properties of Molten Silicon

The results obtained from The present research are summarized as follows (1) MolecularSimulationVapor-liquid equilibrium simulation were performed using the Stillinger-weber potentialwith the Gibbs ensemble Monte Carlo method. In the low temperature region from about 3000 to 3500k，我们的calculation show the stability of phases and good agreement with several experimental results. .On the whole，there is little dependence on the size of the system except near the critical point of silicon：T - D2c - D2=7500±500k and ρ - D2c - D2=750±100kgm d -3 d - 1 as determined by the law of rectilinear(2) Surface Laser-Light scattering MethodIn order to improve and evaluate the accuracy ofsurface laser-light scattering (SLLS) apparatus我们已经measured the surface tension and viscosity of molten NaCl in the temperature range up to1243 K. The accuracy of The measured surface tension is estimated to be±4.1%. The surface tensionand viscosity of molten silicon (99.9995%) have been measured in the temperature range from 1685 to1850k . The obtained surface tension has been correlated by The following equation：σ=800-0.13(T-1685) mNm -1 -1 - D1 The oxygen concentration in The sample after The experiment wasanalyzed。

The results obtained from the present research are summarized as follows.(1) Molecular SimulationVapor-liquid equilibrium simulation were performed using the Stillinger-weber potential with the Gibbs ensemble Monte Carlo method. In the low temperature region from about 3000 to 3500 K, our calculation show the stability of phases and good agreement with several experimental results. On the whole, there is little dependence on the size of the system except near the critical point of silicon: TィイD2cィエD2=7500±500 K and ρィイD2cィエD2=750±100 kgmィイD1-3ィエD1 as determined by the law of rectilinear diameter.(2) Surface Laser-Light scattering MethodIn order to improve and evaluate the accuracy of the surface laser-light scattering (SLLS) apparatus, we have measured the surface tension and viscosity of molten NaCl in the temperature range up to 1243 K. The accuracy of the measured surface tension is estimated to be ±4.1%. The surface tension and viscosity of molten silicon (99.9995%) have been measured in the temperature range from 1685 to 1850 K. The obtained surface tension has been correlated by the following equation: σ=800-0.13(T-1685) mNmィイD1-1ィエD1 The oxygen concentration in the sample after the experiment was analyzed.