Growth and Optical Propertiesof Explosion Phase BoronNitride Octahedron Crystals.

A low temperature and high pressure synthetic route assistedwithball milling has been established to prepare high quality orientatedexplosion phase boron nitride (E-BN) octahedron crystals using H3BO3, iron powders, NH4Cl, and Mg asstarting materials. FSEM, TEM, HRTEM, SAED, XRD, Raman, FTIR, andXPS were employed for characterization of the morphology and structureof as-synthesized E-BN samples. The E-BN was identified as the face-centeredcubic structure with a lattice parameter of 8.245 Å. The typicalparticle sizes were mainly in the range of 30–120 nm. A UVspectrum indicated that the product has an obvious absorption band(5.61 eV). Photoluminescence spectra revealed that it has a dominantultraviolet emission peak at 383 nm. The possible chemical reactionsas well as the proposed mechanism of the growth of E-BN octahedroncrystals were also discussed. [ABSTRACT FROM AUTHOR]