Using supercritical ammonia to obtain a bulk mono-crystal of gallium nitride. In an autoclave, to form a supercritical solvent containing alkali metal ions, are dissolved in a gallium nitride single crystal formed by a flux method in which a feed material generating a supercritical solution, simultaneously or individually, gallium nitride on the seed surface then the re-crystallization and the like.; Supercritical solution, single crystals, gallium nitride
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