HEXAGONAL WURTZITE TYPE SINGLE CRYSTAL, PROCESS FOR PRODUCING THE SAME, AND HEXAGONAL WURTZITE TYPE SINGLE CRYSTAL SUBSTRATE

摘要

Provided is a single crystal with a hexagonal wurtzite structure which is useful as a substrate for various devices and has high purity and is uniform. The single crystal with a hexagonal wurtzite structure, which is obtained by a crystal growth on at least an m-plane of a columnar seed crystal and represented by AX (A representing an electropositive element and X representing an electronegative element) is characterized in that a variation in the concentration of a metal other than the electropositive element A and having a concentration of 0.1 to 50 ppm is within 100%.