Abstract
Very recent results on high-pressure–high-temperature synthesis of novel superhard phases in the B‒C‒N system (diamond-like BC5, rhombohedral B13N2, nanocrystalline cubic boron nitride, orthorhombic γ-B28, etc.) are briefly reviewed.
Notes
Here and subsequently, H V microhardness values are reported in the asymptotic-hardness region, as recommended for hard and brittle materials Citation27.