Convection of molten boric oxide (B2O3) encapsulant during liquid encapsulated Czochralski single crystal growth of GaAs was directly observed by X-ray radiography. The melt flow pattern was monitored using a solid tracer method. The observed flow pattern was axisymmetric, and the flow was steady. The flow of the molten B2O3 was more stable than that of molten silicon. The flow velocity of the molten boric oxide with and without single crystal were about 0.03 and 0.3 mm/s, respectively. Numerical simulation of the molten B2O3 natural convection using commercially available code "FLUENT" was also performed. Three-dimensional calculation was carried out employing observed non-axisymmetric temperature distribution in a crucible holder. The calculated data was able to explain the steady and axisymmetric flow observed even in the non-axisymmetric temperature distribution.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Inorganic Chemistry
- Materials Chemistry