Method of fabricating a single crystal

摘要

An apparatus for fabricating a crystal is provided with a vessel 1 for accommodating a melt 3,with heaters 2 disposed in a bilaterally symmetrical manner on two sides thereof.A section through the front elevation of the vessel 1 has a shape that is bilaterally symmetrical.If a temperature gradient is formed by heaters 2 in a state in which the melt 3 of the crystal is supplied into the vessel 1,in such a manner that the upper part of the vessel 1 is at a high temperature and the lower part thereof is at a low temperature,the high-temperature melt will rise along the inner wall surfaces of the circular section of the vessel 1.A plane surface comprising a vertical line(a "mirror-symmetry plane")11 divides the vessel 1 into two parts vertically,in such a manner that left-side part of the melt rises in the clockwise direction and a right-side part thereof rises in the counterclockwise direction.The melt having this bilaterally symmetrical flow pattern strikes the miror-symmetry plane 11 at the upper end of the vessel 1,whereupon the two parts thereof flow downward towards the low-temperature region in the lower end of the vessel 1.A single crystal is formed as the temperature at the lower end of the vessel 1 is gradually lowered below the melting point of the melt material.