Preparation of boron nitride flakes by a simple powder reaction

抄録

Boron nitride (BN) with flake-like morphology has been synthesized by reacting powder H₃BO₃, Mg and NH₄Cl in an autoclave at 600°C for 10 h. X-ray diffraction (XRD) patterns show the sample has a hexagonal phase with lattice parameters a=0.2506 and c=0.6692 nm. Transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM) indicate the as-synthesized product is mainly pure flakes with a mean size of about 100 nm in width and 600 nm in length. X-ray photoelectron spectra (XPS) give an average B/N atomic ratio of 0.98:1. Fourier transformation infrared spectroscopy (FTIR) has a strong B-N absorption at 1376 cm^-1 and 814 cm^-1.