Vapour-phase reduction and the synthesis of boron-based ceramic phases

Yoon, Su-Jong; Jha, Animesh

doi:10.1007/bf01152935

Cited by 24 publications

(19 citation statements)

References 4 publications

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“…Evidence of surface formation of BN has been seen in other studies, where similar preservation of surface morphologies is observed, 49 and where nanocrystallites are seen to decorate the surface of activated carbon and graphite when the amount of boron oxide is limited. 50 In our case, boron oxide vapor can be reduced on both sides of the two-or three-layer thick graphene sheets. Returning to eq 1, we conclude that the process of Figure 5.…”

Section: Articlementioning

confidence: 97%

Synthesis of Highly Crystalline sp²-Bonded Boron Nitride Aerogels

et al. 2013

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sp(2)-Bonded boron nitride aerogels are synthesized from graphene aerogels via carbothermal reduction of boron oxide and simultaneous nitridation. The color and chemical composition of the original gel change dramatically, while structural features down to the nanometer scale are maintained, suggesting a direct conversion of the carbon lattice to boron nitride. Scanning and transmission electron microscopies reveal a foliated architecture of wrinkled sheets, a unique morphology among low-density, porous BN materials. The converted gels display a high degree of chemical purity (>95%) and crystalline order and exhibit unique cross-linking structures.

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Section: Articlementioning

confidence: 97%

Synthesis of Highly Crystalline sp²-Bonded Boron Nitride Aerogels

et al. 2013

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“…Thus, B 3 C 8 N 8 O 1 can be taken as the effective stoichiometry of the a-BNCO particles. The chemical reaction that occurs during vapor phase reduction can be estimated using the starting compositions of the precursor and catalysts, the relative amount of each, and the gases that are present, and the resultant equation is similar to what Yoon et al [40] and Choi et al [41] previously suggested. [41].…”

Section: Run Nomentioning

confidence: 94%

Observations of nanocrystalline cubic boron nitride formed with plasma spraying

et al. 2016

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a b s t r a c tCubic boron nitride (c-BN) has superior hardness and strength as compared to other ceramics that are commonly used as abrasives and in cutting tool applications. Cubic BN powders are generally produced under high pressures, usually greater than 10 GPa. Here, we report on the synthesis of nanocrystalline c-BN from metastable precursors without high external pressures using a novel plasma spray processing technique. Transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) measurements indicate that the initial metastable precursor particles are amorphous and comprised of boron, carbon, nitrogen and oxygen with weak interatomic bonding that may easily undergo phase transformations during plasma spraying. Postmortem X-ray diffraction and TEM analysis of plasma spray deposits reveal the formation of crystalline phases of BN, and high-resolution TEM observations demonstrate that c-BN can be induced during the plasma spray process with the addition of appropriate catalysts. These observations point to a novel pathway for facilitating the transition from a low-density amorphous state to the high-density cubic BN phase.

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“…This similarity suggests the possibility of the synthesis of a boron-carbon-nitrogen (B-C-N) compound [1][2][3][4][5][6][7] Since graphite has a conductor nature whilst bomn nitride (BN) is an insulator, such a new material BXCNZ could be expected to have interesting adjustable electrical and electronic properties between a conductor and a insulator, depending on the compositional ratio: x:y:z, as shown in Figure 1. This similarity suggests the possibility of the synthesis of a boron-carbon-nitrogen (B-C-N) compound [1][2][3][4][5][6][7] Since graphite has a conductor nature whilst bomn nitride (BN) is an insulator, such a new material BXCNZ could be expected to have interesting adjustable electrical and electronic properties between a conductor and a insulator, depending on the compositional ratio: x:y:z, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 96%

Deposition of boron-carbon-nitrogen ternary thin films by ion-beam-assisted excimer ablation of B 4 C target

Ren

et al. 1998

SPIE Proceedings

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Boron-Carbon-Nilrogen thin films were deposited by laser ablation of B4C target under nitrogen ion-beam bombardment The deposited thin films were set for X-ray photoelectron spectroscopy (XPS) and ellipsometry measurements. The results showed that, in the ternary thin films, boron, carbon and nitrogen species were chemically bound to each other instead of simle mixtures. The B-C bonds were broken by the introduced energetic nitrogen ions and, subsequently, C-N and B-N bonds can be fonned. The ellipsometry measurement gave the optical band gap ofO.48 eV for the thin films deposited under 50 eVnitrogen ion beam bombardment. According to the analyses, the nitrogen ion beam energy should be lower than 100 eV in most cases.

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Vapour-phase reduction and the synthesis of boron-based ceramic phases

Cited by 24 publications

References 4 publications

Synthesis of Highly Crystalline sp²-Bonded Boron Nitride Aerogels

Synthesis of Highly Crystalline sp²-Bonded Boron Nitride Aerogels

Observations of nanocrystalline cubic boron nitride formed with plasma spraying

Deposition of boron-carbon-nitrogen ternary thin films by ion-beam-assisted excimer ablation of B 4 C target

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Vapour-phase reduction and the synthesis of boron-based ceramic phases

Cited by 24 publications

References 4 publications

Synthesis of Highly Crystalline sp2-Bonded Boron Nitride Aerogels

Synthesis of Highly Crystalline sp2-Bonded Boron Nitride Aerogels

Observations of nanocrystalline cubic boron nitride formed with plasma spraying

Deposition of boron-carbon-nitrogen ternary thin films by ion-beam-assisted excimer ablation of B 4 C target

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Synthesis of Highly Crystalline sp²-Bonded Boron Nitride Aerogels

Synthesis of Highly Crystalline sp²-Bonded Boron Nitride Aerogels