X-ray diffraction investigation of ultrafine boron nitride powders

Gurov, S. V.; Rezchikova, T. V.; Chukalin, V. I.; Торбов, В. И.; Troitskii, V. N.

doi:10.1007/bf00791947

Cited by 3 publications

(4 citation statements)

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“…X-ray diffraction [3] revealed that the coarsening of BN particles (in the basal plane) led to ordering and intensified reflection 002, which is observed, like reflections 004, when carbon is ordered. According to [4], the distance between the basal layers of carbon, being the evidence of structural ordering, is also determined by the size of particles with a large surface area.…”

Section: Resultsmentioning

confidence: 94%

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Structural types of boron nitride particles produced by carbothermal synthesis

Oleinik

Lyashenko

Prilutskii

et al. 2011

Powder Metall Met Ceram

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Transmission electron microscopy and microdiffraction are used to examine boron nitride produced by carbothermal synthesis (using saccharose as a carbon-containing component) in the temperature range 1000-1450°C in nitrogen. It is established that onion-like particles form during structural ordering of turbostratic boron nitride in the range 900−1000°C. The structural types of BN particles are classified according to: 1) crystal morphological features (onion-like particles, cylindrical and faceted tubes, and lamellas), 2) formation mechanisms (structures of growth formed through nucleation and structures of breakdown formed through structural transitions), and 3) synthesis temperatures. The tubes grow from the gas phase and their crystal morphological forms differ in phase composition (cylindrical tubes consist of the hexagonal BN phase and faceted tubes of the rhombohedral one). At T ≥ 1350°C, rhombohedral-hexagonal phase transition and transformation into multilayered polytypes occur in faceted tubes due to a highly anisotropic thermal expansion coefficient of graphite-like modifications of boron nitride.

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Section: Resultsmentioning

confidence: 94%

“…The substructural evolution of BN aggregates synthesized in the range 1000-1300°C can be explained using the papers [3][4][5][6][7]. X-ray diffraction [3] revealed that the coarsening of BN particles (in the basal plane) led to ordering and intensified reflection 002, which is observed, like reflections 004, when carbon is ordered.…”

Section: Resultsmentioning

confidence: 99%

Structural types of boron nitride particles produced by carbothermal synthesis

Oleinik

Lyashenko

Prilutskii

et al. 2011

Powder Metall Met Ceram

View full text Add to dashboard Cite

show abstract

“…Reactions (18), (19b) and (20b) do not use C for formation of h-BN. C is nevertheless probably necessary, however, as dissolution of nitrogen in the calcium borate melt in accord with Reactions (16) and (17) and also formation of h-BN with Reactions (18), (19b) and (20b) are favored by low O 2 pressures which is provided by C.…”

Section: Reaction Mechanismmentioning

confidence: 97%

“…6,10 In order to investigate the effect of CaCO 3 addition on the growth of h-BN crystallites, average crystal thickness values in the c-axis direction, L c , of the formed h-BN were calculated by the Scherrer formula. 17,18 Relatively crude measurements can be done in the range of 0-500Å with the Scherrer formula. 17 L c is defined as the mean height of a pack of parallel and crystallographically connected hexagonal layers.…”

Section: Effect Of Caco 3 Addition On Formation Of Bn and B 4 Cmentioning

confidence: 99%