Abstract
The temperature dependence of the sound velocity of molten silicon was measured up to 1600°C using a newly developed high-temperature ultrasonic measurement system. The system is based on the phase-comparison method and provides highly precise sound-velocity measurement. The sound velocity of molten silicon increases with increasing temperature in the measured temperature region. This tendency is different from that of the simple liquid metals, and of molten germanium and tin as well. This anomaly could be attributed to the microscopic structural changes in the liquid.
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