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Patent Pending PROBLEM TO BE SOLVED: To provide a pressure vessel for producing a crystal of a group 13 element nitride compound, in which a material for a shield part is strengthened and thereby which can be used repeatedly with an increased frequency. ; SOLUTION: The pressure vessel is used for producing a crystal of a group 13 element nitride compound in an ammonia atmosphere having a temperature of 600-850[deg.]C and pressure of 30-250 MPa.
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