Title
Thermal properties and formation mechanism of h‐BN nanoneedles synthesized via carbothermic reduction reactio
Author
Yasser Momtaz Zak Ahmed, Said Moawad El‐Sheikh, Asmaa Abd‐El‐Baset Abd Allah, Said Anwar
Year
2017
Journal
International Journal of Applied Ceramic Technology
Abstract
Hexagonal boron nitride (BN) was synthesized through the carbothermic reduction reaction (CRR) of boric acid using lactose as a carbon source under the nitrogen atmosphere at 1500°C for 3 hours. The boron/carbon (B/C) molar ratio was controlled during the CRR, and the produced samples were investigated by XRD diffraction pattern, FTIR analysis, and Raman spectra. Boron carbide (B4C) was formed in samples that have a higher carbon content, in addition to boron nitride. While boron nitride pure sample was produced from lower carbon content samples. Formation of B4C was found to depend on the B/C molar ratio. The morphology of the produced powder was also investigated by SEM and TEM, which revealed that the samples consist of nanoneedles of BN and hexagonal particles of B4C. The vapor‐solid (VS) reaction mechanism was processed greatly with increasing boron amount, producing boron nitride nanoneedles, which compete with the liquid‐solid (LS) reaction mechanism. The physicochemical properties of the produced samples were studied by DTA, UV, PL, and AC impedance measurements, and revealed that the samples are promising to many proper applications.
Instrument
RFT-6000
Keywords
FT-Raman, Boron nitride, carbothermic reduction reaction