Influence of Crucible Support Rod on the Growth Rate and Temperature Gradient in a Bridgman Growth of Tin Crystal

摘要

Bridgman growth of tincrystal was carried out in a graphite crucible that was fixed on a quartz support rod or a copper one. The growth rate and axial temperature distribution were examined by recording the temperature variation with time at each of four prescribed positions in the solid-liquidsystem during solidification, l) Actual growth rate of crystal increased with progress of solidification while the furnace elevated at a constant rate, but the tendency was different depending on the type of support rod used. 2) We could increase the temperature gradient in the crystal-meltsystem without varying the interface shape, if we used a copper support rod in place of a quartz one together with raising the maximum temperature of the furnace. 3) The thermal conductivity of the crucible support rod is thought to be an important factor affecting the growth rate and temperature gradient in the growth system in the Bridgman process.