Method for producing hexagonal boron nitride single crystals

Abstract

A method for producing hexagonal boron nitride single crystals including mixing boron nitride crystals with a solvent thereby obtaining a mixture, heating and melting the mixture under high-temperature and high-pressure thereby obtaining a melted mixture, and rectystallizing the melted mixture thereby producing hexagonal boron nitride single crystals, wherein the solvent is boronitride of alkali earth metal, or boronitride of alkali metal and the boronitride of alkali earth metal.

Dependencies are inferred from the claim text.