EFFECT OF MOISTURE ON THE PROPERTIES AND STRUCTURE FORMATION OF BN UNDER CONCENTRATED LIGHT

L. L. Sartinska, Ye. V. Voinich, T. Eren, E. Altay, G. A. Frolov, László Kótai

Abstract


The results of direct synthesis of boron nitride from boron powders of mean sizes of 0.05, 0.20, and 2.00 μm in nitrogen flow with impurity of H2O in a xenon high-flux optical furnace are presented. Formation of equiaxed, plate-like powders and film-like structures of different sizes was observed. The presence of moisture contributes to the formation of large film-like structures in BN powders from nanosized boron. Carbon impurity in boron powder of mean size of 0.20 μm facilitates formation equiaxed nanosized powders of the smallest mean size. High-temperature gradients in a xenon high-flux optical furnace results in the appearance of vibrations of w-BN at 1097-1107 cm−1 in the FTIR spectra besides the h-BN vibrations of BN powders produced. The presence of moisture in nitrogen flow promotes formation of new BN structures and other compounds as well. Vibrations belong to B-O-H bonds (1184-1193 cm-1), N-B-O and B-O-B linkages (1107–924 and  ~ 700 cm−1, respectively), and tetrahedral BO4units in B2O3 could be detected in the FT-IR spectra of BN powders produced and XRD studies confirmed that the produced BN powders contains significant amount of sassolite (H3BO3, boric acid) as well.

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DOI: http://dx.doi.org/10.17628/ecb.2015.4.165-168

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