Abstract
Flow visualization during floating zone crystal growth has been conducted for the first time. Floating zone growth of 6 mm diameter NaNO 3 single crystals was carried out using a ring heater made of a thin Pt wire. The flow patterns in the melt were revealed by tracer particles illuminated by a thin laser light sheet, i.e., the laser light-cut technique. A color super-VHS videotape movie was made. Thermocapillary convection, forced convection and the shapes of both the growth and feed fronts were all clearly shown. The forced convection was induced by fast feed-rod rotation, crystal rotation and feed/crystal counterrotation. These results confirmed those predicted by computer simulation. A limited number of the videotape copies will be available upon request as the photographs shown in the present report are far less clear than the videotape itself.
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