DIE AND DIE PACK FOR RAISING SAPPHIRE SINGLE CRYSTAL, SAPPHIRE SINGLE CRYSTAL RAISING APPARATUS, AND SAPPHIRE SINGLE CRYSTAL RAISING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a sapphire single crystal and a sapphire substrate made excellent in a large diameter and a crystal quality by determining the curvature R of a die upper face to be used for raising a sapphire single crystal by an EFG method, and to provide a die and a die pack to be used for raising a sapphire single crystal by an EFG method, and a method for raising a sapphire single crystal.;SOLUTION: A die for use in raising a sapphire single crystal by an EFG method is characterized in that a top face has a curvature R in a longitudinal direction, and in that said curvature R is five times or less than the width W in a longer direction.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT