A year later, superhard low-compressible cubic BN-C solid solutions with stoichiometry close to BCN (c-BCN) were synthesized by isoentropic shock compression . According to TEM-SAED-EELS studies , boron, carbon and nitrogen atoms are homogeneously distributed over c-BCN crystal lattice without forming superstructures. c-BCN has one of the largest bulk modulus (B 0 = 412 GPa ) being second only to diamond, and very high Knoop hardness (52 GPa ).