Patent ID: 8609059

Claim:
A method for producing a nitride crystal, the method comprising: charging a raw material of the nitride crystal and a mineralizer to a raw material dissolution region of a vessel; placing a baffle plate having open pores in the vessel such that the vessel is divided into two regions consisting of the raw material dissolution region and a crystal growth region; placing a seed crystal in the crystal growth region; closing the vessel with an airtight seal; charging the closed vessel with ammonia; heating the sealed vessel to a temperature to form a solution of the mineralizer in ammonia; growing the nitride crystal on the seed crystal in a subcritical or supercritical state; wherein at least one of a surface portion of the vessel and a member provided in the vessel contacting the solution of the mineralizer in ammonia comprises a metal or alloy having one or more selected from the group consisting of tantalum (Ta), tungsten (W) and titanium (Ti), and a surface roughness (Ra) of the surface portion contacting the saturated mineralizer solution is less than 1.80 μm.