| 摘要 |
PROBLEM TO BE SOLVED: To reduce the loss in a single crystal raw material and to improve workability and yield at the time of cutting work by using a crucible made of glassy carbon and having the inner face being a polygonal form. SOLUTION: As the glassy carbon, hard and amorphous carbon, which exhibits a black glassy appearance and shows bright shell-shaped fracture, is used. The glassy carbon is generally obtained by carbonizing a cured material of a thermosetting resin. As the thermosetting resin, a phenol resin, an epoxy resin, an unsaturated polyester resin, or the like, is cited. The form of the inner face of a crucible is one of the polygonal forms. Though a triangle form, a square form, a pentagonal form, a hexagonal form, or the like,, is cited, a form close to the objective single crystal is preferably adopted. The preferable length of one side of the inner face of a part forming a cave is 1 to 300 mm from the viewpoint of processability, or the like. The preferable crucible has the inner face having the arithmetic mean roughness (Ra), based on the JIS B0601, of not more than 5 μm, which surface roughness is measured at least at four positions. Thereby, a good single crystal can be grown. |
