Dependence of the oxygen content of boron nitride on heat-treatment temperature and its effect on the structure and strength characteristics of this compound

Vikulin, V. V.; Rusanova, L. N.; Kuznetsova, V. F.; Buravov, A. D.; Lisovskiĭ, I. P.; Smakhtin, L. A.

doi:10.1007/bf00796561

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…This is shown by the pronounced drop in the oxygen content and horizontal transition to the blue region at approximately 1000 o C, which is attributed to increased conversion of the precursors to BN and elimination of oxygen from the starting precursor. 45,46 Similarly, higher NH3 flowrates, for a given synthesis temperature and starting ratio of precursors, leads to lower oxygen contents. This is illustrated by the vertical transitions from the green to blue regions for temperatures greater than 950 o C. As predicted, higher flowrates of ammonia, an additional nitrogen source, assist in nitriding the boron/oxygen and nitrogen precursors by breaking the B-O covalent bond in boric acid.…”

Section: -Stage 1: Experimental Trends Across Multi-dimensional Sample Setmentioning

confidence: 99%

A response surface model to predict and experimentally tune the chemical, magnetic and optoelectronic properties of oxygen-doped boron nitride

Shankar

Mistry

Lubert-Perquel

et al. 2021

Preprint

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A new material platform for boron nitride (BN) as a heterogeneous photocatalyst for solar fuels synthesis has recently emerged. One of the bottlenecks of this material is the lack of photoactivity under visible light, which hinders its rate performance. Theoretical studies have predicted that tuning the oxygen content in oxygen-doped BN (BNO) might be used to lower and vary the band gap. However, this is yet to be verified experimentally. We present herein a systematic experimental route facilitating simultaneous tuning of the chemical, magnetic and optoelectronic properties of BNO using a multivariate synthesis parameter space. Deep visible range band gaps (1.50 – 2.90 eV) were experimentally achieved and tuned over an oxygen composition of 2 – 14 at. %, and specific paramagnetic OB3 content of 7 – 294 a.u. g-1, thus supporting theoretical predictions. Through designing a response surface via a design of experiments (DOE) process, the key synthesis parameters influencing the chemical, magnetic and optoelectronic properties of BNO were identified. In addition, model prediction equations relating the aforementioned properties to the synthesis parameter space are presented. Accurate model predictions for the oxygen content and band gap were conducted and validated experimentally. Such a methodology is valuable for further advances in tailoring and optimising BN materials for heterogeneous photocatalytic reactions.

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Section: -Stage 1: Experimental Trends Across Multi-dimensional Sample Setmentioning

confidence: 99%

A response surface model to predict and experimentally tune the chemical, magnetic and optoelectronic properties of oxygen-doped boron nitride

Shankar

Mistry

Lubert-Perquel

et al. 2021

Preprint

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“…* A large excess of carbamide could lead to both additional formation of gaseous products and appearance of crystalline phases in the system H − C − O − N, the lines for which we also observed in the x-ray diffraction patterns of the charges. * It is specifically such ratios that are typically used in synthesis of BN [2][3][4][5][6]. Charges 4 and 6 (K = 1 : 3) have practically close (Table 1) values of the specific surface area, which however are greater than for charge 1 (K = 1 : 1).…”

Section: Forming the Chargesmentioning

confidence: 99%

“…Ideas about the chemistry of carbamide synthesis of BN, like the data on the kinetics of nitriding and the structure formation patterns for boron nitride, are contradictory [2][3][4][5][6][7][8][9][10]. This is connected with the fact that charges have been nitrided that were obtained under various conditions (medium, temperature, time) and with different mole ratios of boric acid to carbamide.…”

Section: Introductionmentioning

confidence: 99%

Structure formation patterns in carbamide synthesis of nanocrystalline graphite-like boron nitride

Kurdyumov

Bartnitskaya

Lyashenko

et al. 2005

Powder Metall Met Ceram

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We have used chemical analysis, x-ray diffractometry, transmission and scanning electron microscopy, and also measurement of the specific surface area to study the characteristic patterns of nitriding and structure formation in graphite-like BN powders synthesized by the carbamide method under various conditions. We have studied the effect on the synthesis process from the ratio of boric acid to carbamide in the starting mixture, preliminary grinding of the charge, the nitriding temperature and time. We show that the major factor determining the composition and structure of the product synthesized at 900-1200°C is the ratio of the starting components. Carbon-free BN of stoichiometric composition is formed for a 1 : 3 ratio of boric acid to carbamide as a result of two-hour nitriding at 1200°C. The graphite-like BN obtained is characterized by a turbostratic nanocrystalline structure with a specific surface area of 100 m 2 /g and high nanoporosity of the powder particles.

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Sintering of turbostratic-structure boron nitride powders

Rusanova¹,

Gorchakova²

1989

Powder Metall Met Ceram

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Dependence of the oxygen content of boron nitride on heat-treatment temperature and its effect on the structure and strength characteristics of this compound

Cited by 8 publications

References 2 publications

A response surface model to predict and experimentally tune the chemical, magnetic and optoelectronic properties of oxygen-doped boron nitride

A response surface model to predict and experimentally tune the chemical, magnetic and optoelectronic properties of oxygen-doped boron nitride

Structure formation patterns in carbamide synthesis of nanocrystalline graphite-like boron nitride

Sintering of turbostratic-structure boron nitride powders

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