Phase and structural transformations of wurtzite-type boron nitride at high temperatures

Kurdyumov, A. V.; Ostrovskaya, N. F.; Pilyankevich, A. N.; Balan, Tudor; Bochko, A. V.

doi:10.1007/bf00792410

Cited by 4 publications

(2 citation statements)

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“…The well-known Tamman rule states that the solid diffusion intensifies at a temperature corresponding to a half of absolute melting temperature [89]. The Tamman temperature of hBN is T T ≈ 1650 K (a half of T m = 3300 K at 6.5 GPa, according to the phase diagram of BN [69]), which is almost the same that the onset temperature of the observed transformation, T t ≈ 1620 K. This fact reveals the critical role of solid diffusion in direct BN phase transformation (e.g., as in the case of ZnO previously observed in situ [85]) in accordance with HPHT diffusion-reconstructive mechanism [44,90].…”

Section: Kinetics Of Bn Phase Transformationssupporting

confidence: 78%

“…Analysis of XRD patterns of wBN [42] reveals non-uniform widening of hkl reflections and pronounced asymmetry of some lines. This is indicative of stacking faults and is typical for diamond-like materials [43,44]. Stacking faults additionally confirm the martensitic/displacive nature of wBN formation from ordered regions (the mechanism will be discussed later).…”

Section: New Advanced B–n Materialsmentioning

confidence: 68%

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High-Pressure Design of Advanced BN-Based Materials

Kurakevych

Solozhenko

2016

Molecules

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Abstract:The aim of the present review is to highlight the state of the art in high-pressure design of new advanced materials based on boron nitride. Recent experimental achievements on the governing phase transformation, nanostructuring and chemical synthesis in the systems containing boron nitride at high pressures and high temperatures are presented. All these developments allowed discovering new materials, e.g., ultrahard nanocrystalline cubic boron nitride (nano-cBN) with hardness comparable to diamond, and superhard boron subnitride B 13 N 2 . Thermodynamic and kinetic aspects of high-pressure synthesis are described based on the data obtained by in situ and ex situ methods. Mechanical and thermal properties (hardness, thermoelastic equations of state, etc.) are discussed. New synthetic perspectives, combining both soft chemistry and extreme pressure-temperature conditions are considered.

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