Group III nitride crystal, crystal growth process and crystal growth apparatus of group III nitride
A crystal growth method of a group III nitride includes the steps of forming a melt mixture of an alkali metal and a group III element in a reaction vessel, and growing a crystal of a group III nitride formed of the group III element and nitrogen from the melt mixture in the reaction vessel, wherein the step of growing the crystal of the group III nitride is conducted while controlling an increase rate of degree of supersaturation of a group III nitride component in the melt mixture in a surface region of the melt mixture.
1. A crystal growth apparatus for crystallizing a group III nitride formed of a group III element and nitrogen from a melt mixture of an alkali metal and a substance containing a group III element and a substance containing nitrogen, comprising:
a reaction vessel holding therein said melt mixture; and
a structure for supplying a heated gas into said reaction vessel,
said structure comprising:
a gas supply line supplying at least a nitrogen gas to said reaction vessel;
a heating container provided on said gas supply line, said heating container being configured to preheat said nitrogen gas supplied through said gas supply line to said reaction vessel; and
a valve provided on said gas supply line between said heating container and said reaction vessel.