Synthesis of boron nitride

Boron nitride (BN) - in all its various structures - is a synthetic product and not found in nature. Boron nitride is a extraordinary topic in the area of materials science. Boron and nitrogen are neighbors of carbon in the periodic table, and therefore BN phases are isoelectric to the corresponding carbon phases.1 Due to the special bonding behaviors of boron and nitrogen the BN exists in many different structures. The well-defined crystallographic structures are hexagonal BN (h-BN), rhombohedral BN (r-BN), wurtzitic BN (w-BN), and cubic BN (c-BN).2 Additionally, other crystalline and amorphous structures exist. Parts prepared of h-BN as well as c-BN are of great interest for industrial applications but also for materials science.3 Hexagonal boron nitride (h-BN) is a structural analog of graphite lattice while consisting of an equal number of boron and nitrogen atoms.2 It crystallizes similar to graphite in a hexagonal sheet layered structure, and therefore it is often referred to as "white graphite".3 BN nanostructures, including nanoparticles, nanotubes, nanofibers, nanoribbons, nanosheets have attracted much attention in the past few decades due to their promising properties such as low density, excellent chemical inertness, superb oxidation resistance, high thermal conductivity, and unique catalytic properties.2 In this study, the structures are synthesized using bottom-up, low-temperature (∼300 ˚C), solid-state reaction of melamine and boric acid giving rise to porous and mechanically stable interconnected h-BN layers.synthesized compound are stable solid whose structures were determined on the basis of their X-ray, FT-IR, TGA, and EDS data.

کلیدواژه ها:

Boron nitride ، Hexagonal-BN ، Cubic-BN ، High-pressure high-temperature synthesis ، Chemical vapor deposition