Method for producing a single crystal.

摘要

A single crystal is produced by previously forming a macrocrystal grain having substantially the same crystal structure as crystal grains composing a polycrystal showing a discontinuous crystal grain growth or forming said macrocrystal grain after preparing said polycrystal in contact with the crystal grains composing the polycrystal and heating such a contacted body at a temperature lower than the temperature causing the discontinuous crystal grain growth of the polycrystal to grow crystal while integrating the above described macrocrystal grain with the crystal grains composing the polycrystal whereby a single crystal is grown.