Synthesis of superhard cubic BC2N
Abstract
Cubic BC2N was synthesized from graphite-like BC2N at pressures above 18 GPa and temperatures higher than 2200 K. The lattice parameter of c-BC2N at ambient conditions is 3.642(2) Å, which is larger by 1.48% than would be expected based on ideal mixing between diamond and cubic boron nitride. The bulk modulus of c-BC2N is 282 GPa which is one of the highest bulk moduli known for any solid, and is exceeded only by the bulk moduli of diamond and c-BN. The hardness of c-BC2N is higher than that of c-BN single crystals which indicates that the synthesized phase is only slightly less hard than diamond.
- Publication:
-
Applied Physics Letters
- Pub Date:
- March 2001
- DOI:
- 10.1063/1.1337623
- Bibcode:
- 2001ApPhL..78.1385S
- Keywords:
-
- 81.05.Je;
- 62.20.Qp;
- 81.20.-n;
- 62.20.Dc;
- 81.40.Jj;
- 68.35.Gy;
- 81.40.Np;
- 61.66.Fn;
- 62.50.+p;
- 81.40.Vw;
- Ceramics and refractories;
- Tribology and hardness;
- Methods of materials synthesis and materials processing;
- Elasticity elastic constants;
- Elasticity and anelasticity stress-strain relations;
- Mechanical properties;
- surface strains;
- Fatigue corrosion fatigue embrittlement cracking fracture and failure;
- Inorganic compounds;
- High-pressure and shock wave effects in solids and liquids;
- Pressure treatment