Author/Authors :
Qian، Yitai نويسنده , , Hu، Junqing نويسنده , , Lu، Qingyi نويسنده , , Tang، Kaibin نويسنده , , Zhou، Guien نويسنده , , Liu، Xianming نويسنده , , Yu، Shu-Hong نويسنده , , Wu، Jian-Xin نويسنده ,
Abstract :
Nanocrystalline boron nitride (BN) with a whisker-like morphology has been synthesized from the reaction of KBH4 and NH4Cl at a temperature of 650°C and a pressure of about 22 MPa. The pressure is much lower than that of previous routes and the yield of nanocrystalline BN reached 70%. X-ray powder diffraction pattern indicated the coexistence of two structures of BN: hexagonal and cubic. Fourier transformation infrared spectroscopy was used to distinguish the sp2-bonded hexagonal and sp3-bonded cubic phase. X-ray photoelectron spectra analysis gave the average composition of B1.01N.
Keywords :
fluorophosphates , fluorides , Phase transition , Structure , magnetism
