Hard boron-containing material useful in manufacture of e.g. composites, grinding wheels, superconductors, thermoelectrics or radiation absorbers has a defined crystal structure

摘要

A material containing boron together with carbon, nitrogen, boron, oxygen, silicon and/or phosphorus has a defined crystal structure. A material has the crystal structure with the following characteristics : (1) a structural unit (1) is formed of 12 to an icosahedron of atoms or atom groups; (2) structure (1) is in the form of a strained or deformed cubic, densest packing; (3) the octahedral spaces created by structure (1) in the packing are predominantly occupied by second structures (2) of at least one atom; (4) the tetrahedral spaces created by structure (1) in the packing are predominantly occupied by third structures of at least one atom; (5) the third structures are bonded (especially covalently) with each of the four first structures (1) of the corresponding tetrahedron; (6) at least some of the atoms in structure (1) are of boron; and (7) at least some of the atoms of the third structure are of carbon, nitrogen, boron, oxygen, silicon and/or phosphorus.