Abstract
Reactions between titanium and microcrystalline boron powders in a Na2B4O7 ionic melt at temperatures from 700 to 850°C and those between TiCl4 and NaBH4 at temperatures from 300 to 750°C and hydrogen pressures of up to 10 MPa, with no solvent, have been studied by X-ray diffraction, scanning electron microscopy, thermogravimetry, and elemental analysis. The results demonstrate that TiB2 formation occurs at t 〉 730°C and 550°C, respectively. According to scanning electron microscopy data, the TiB2 powder consists of particles 70–75 and 35–50 nm size, and the crystallite size evaluated from X-ray diffraction data is 55 and 30 nm, respectively, in agreement with the equivalent particle diameters obtained from the specific surface area of the TiB2 powders: 60 and 45 nm, respectively.
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Original Russian Text © L.S. Volkova, S.E. Kravchenko, I.I. Korobov, A.M. Kolesnikova, N.N. Dremova, A.G. Burlakova, G.V. Kalinnikov, S.P. Shilkin, 2013, published in Neorganicheskie Materialy, 2013, Vol. 49, No. 11, pp. 1173–1177.
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Volkova, L.S., Kravchenko, S.E., Korobov, I.I. et al. Preparation of titanium diboride nanopowders of different particle sizes. Inorg Mater 49, 1086–1090 (2013). https://doi.org/10.1134/S0020168513110137
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DOI: https://doi.org/10.1134/S0020168513110137