A contribution to the crystallochemistry of boron nitride

Brožek, Vlastimil; Hubác̆ek, Milan

doi:10.1016/0022-4596(92)90161-n

Cited by 43 publications

(23 citation statements)

References 5 publications

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“…The strong absorption bands having a centre at B770 cm À1 and B1420 cm À1 unambiguously denote the presence of B-N linkage (stretching mode), which can be attributed to the in-plane and out-of-plane vibration modes of the sp 2 hybridized BN. 43,44 The broadening observed in the B-N absorption bands can be ascribed to the incorporation of carbon atoms into the host BN lattice. 45 A sharp edge related to the B-C stretching bond is observed at B1240 cm…”

Section: Structural Analysismentioning

confidence: 99%

New emerging rare-earth free yellow emitting 2D BCNO nanophosphor for white light emitting diodes

et al. 2015

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We have demonstrated a new emerging rare-earth free highly-efficient two dimensional (2D) boron carbon oxynitride (BCNO) yellow emitting nanophosphor with high quantum efficiency for white light emitting diode (WLED) devices. This BCNO nanophosphor exhibits 2D layered structures analogous to hexagonal BN phase. Further, the EELS and XPS results confirm the nanophosphor consisted of B, C, N and O elements. The BCNO nanophosphor shows a broad highly intense yellow emission band centered at 580 nm corresponding to 470 nm excitation wavelength with a quantum efficiency approaching 89%. This novel nanophosphor with strong emission has subsequently been integrated to chip on board (CoB) based blue LEDs in order to fabricate WLEDs devices with a color rendering index of 92. Low color temperature (4899) and better CIE color coordinates (x = 0.3496, y = 0.3679) of a fabricated WLEDs device supports a 2D BCNO nanophosphor that could be an exceptional choice for CoB based WLEDs. Hence, our method provides a facile synthesis of rare-earth free 2D lightweight BCNO nanophosphor and its integration with CoB based blue LEDs for next generation advanced solid state white light applications.

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Section: Structural Analysismentioning

confidence: 99%

New emerging rare-earth free yellow emitting 2D BCNO nanophosphor for white light emitting diodes

et al. 2015

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“…A removal of the oxygen impurities, coinciding with the growth and ordering of the BN layers to form crystalline BN, requires temperatures above 1350°C. [29,30] The diffraction pattern of BN coated on alumina ( Figure S3) shows a mixture of two alumina phases, γ-alumina and θ-alumina, the latter being obtained by thermal degradation of γ-alumina at temperatures above 800°C. Remarkably, no indication was found in the diffraction pattern for the formation of the thermodynamically stable α-alumina during the nitridation process, despite the thermal treatment of the coated material at 1100°C for 24 h.…”

Section: Resultsmentioning

confidence: 99%

Turbostratic Boron Nitride Coated on High‐Surface Area Metal Oxide Templates

et al. 2007

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Keywords: Boron nitride / Turbostratic / Metal oxide templates / Catalyst support material / Nanostructure Boron nitride coatings on high-surface area MgAl 2 O 4 and Al 2 O 3 have been synthesized and characterized by transmission electron microscopy and by X-ray powder diffraction. The metal oxide templates were coated with boron nitride using a simple nitridation in a flow of ammonia starting from ammonium borate adsorbed on MgAl 2 O 4 or γ-Al 2 O 3 .

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“…4b and the identification of boron using EDX, the reduced powder was found to be SiC partly covered with t-BN. It is well known that t-BN is transformed into h-BN, [26][27][28] analogous to the structural Fig. 3.…”

Section: Characterizationmentioning

confidence: 96%

Fabrication of Boron Nitride Dispersed Nanocomposites by Chemical Processing and Their Mechanical Properties

Kusunose

2006

J. Ceram. Soc. Japan

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‫ك‬કɟɵɃɁȡ᧸ǓǮᳶ‫ك‬ɣȮảոᄃɒɖ⓹۰ቦᄦǽΰ⓯ǷǬǽᣀමᏙ៙ଯ۠ গРগક᧳Ꮱᲇકᮾ᳣ཀࢫ567-0047 গРಊ⇹ቆలῡ᳇ȹˎ 8-1Hexagonal boron nitride h-BN dispersed nanocomposites were fabricated through a chemical process involving sintering of matrix ceramic powders covered partly with turbostratic BN t-BN, which was synthesized by the reduction of a mixture of boric acid and urea precipitating on the matrix ceramic powder during drying after wet-ball milling. Silicon carbide SiC, silicon nitride Si 3 N 4 , alumina Al 2 O 3 and aluminum nitride AlN were employed as matrix for h-BN dispersed nanocomposites. The nano-sized h-BN particles were found to be homogeneously dispersed within the matrix grains as well as at grain boundaries, which is typical of nanocomposite structures. As a result, the present nanocomposites showed unique and excellent properties such as high strength, low Young's modulus, high thermal shock resistance, and good machinability.

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A contribution to the crystallochemistry of boron nitride

Cited by 43 publications

References 5 publications

New emerging rare-earth free yellow emitting 2D BCNO nanophosphor for white light emitting diodes

New emerging rare-earth free yellow emitting 2D BCNO nanophosphor for white light emitting diodes

Turbostratic Boron Nitride Coated on High‐Surface Area Metal Oxide Templates

Fabrication of Boron Nitride Dispersed Nanocomposites by Chemical Processing and Their Mechanical Properties

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