Structure and Properties of β-Rhombohedral Boron Powders Produced by Mechanical Grinding

Gabuniya, D. L.; Tsagareishvili, Otar; Chkhartishvili, Levan; Miridzhanashvili, Z. M.

doi:10.1007/s11106-014-9611-5

Cited by 2 publications

(1 citation statement)

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“…This assumption is supported by the detected high content of boric acid. Surface structural defects activate oxidation and hydrogenation processes in boron fine particles [ 25 , 26 ] in the presence of water vapor forming boron oxide (B 2 O 3 ) and then boric acid shell-layers (in Figs. 2 b and 3 are marked only H 3 BO 3 -peaks because for such multiphase mixture they are practically indistinguishable from B 2 O 3 -peaks), which mask the β-B crystalline core ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of concentrated light on morphology and vibrational properties of boron and tantalum mixtures

Sartinska

Chkhartishvili

Voynich

et al. 2018

Heliyon

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Heating a mixture of boron (impurities: carbon ∼ B50C2, boric acid – H3BO3) and tantalum (Ta) powders in nitrogen flow in a xenon high-flux optical furnace was performed. As-received powder composed of h-BN, H3BO3, TaB2, B9H11 and a number of other phases including β-rhombohedral boron, apparently, heavily doped with Ta. FT–IR examination of any sample of the material reveals the complicated vibration spectrum containing, in particular, an absorption band near 2260 cm−1. The shapes of these bands are different for samples because powders were synthesized at different temperatures. Known, that in β-rhombohedral boron lattice, there are nano-sized voids of different types, which allow an accommodation of single atoms or small groups of atoms. Theoretical calculations performed by the method of quasi-classical type yields the same value, 2260 cm−1, for the vibrations frequency of Ta atoms in D-type crystallographic voids in β-rhombohedral boron lattice. Since, Ta atoms are known to prefer accommodation just in D-voids the experimentally detected bands can be identified with localized vibrations of Ta atoms.

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Section: Resultsmentioning

confidence: 99%