[2E09-15] Two-Dimensional Materials 

2:15 PM - 2:45 PM JST(5:15 AM - 5:45 AM UTC)

[2E09【依頼講演】] Impurity/isotope control of hBN by using flux and metathesis synthesis route under high pressure

*Takashi Taniguchi¹ (1. NIMS (Japan))

Hexagonal boron nitride BN (hBN) and cubic BN (cBN) are known as the representative crystal structures of BN. The former is chemically and thermally stable and has been widely used as an electrical insulator. The latter, which is a high-density phase, is an ultra-hard material second only to diamond. The color of the cBN crystals were always amber or brownish so far which is attributed by carbon and oxygen impurity. After some struggles for high pressure and high temperature (HPHT) solution growth, we could find suitable solvent of Ba-BN system which gave us high purity cBN and hBN crystals. It is emphasized that hBN crystals exhibits superior properties as ultra violet light emitter as well as a substrate of graphene devices. In this paper, our recent studies on hBN single crystals growth under HP with respect to impurity controls involving isotope ratio will be reported.

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