Patent ID: 7531038

Claim:
A group-III nitride crystal growth method comprising the steps of: a) preparing a mixed molten liquid of sodium metal and a substance at least containing gallium metal; b) causing growth of a gallium nitride crystal from the mixed molten liquid prepared in said step a) and a substance at least containing nitrogen; and c) creating a state in said step b) in which nitrogen can be introduced into the molten liquid prepared by said step a); wherein the purity of the sodium metal used in said step a), the purity of the molten liquid prepared in said step a), and the purity of the substance at least containing nitrogen used in said step b) are so high that the surface of the mixed molten liquid used in said step b) is free from being covered by polycrystalline or amorphous gallium nitride, wherein a predetermined container made of pyrolytic BN is used for the crystal growth, and wherein the alkaline metal has a purity of at least 99.95%.