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Cubic and hexagonal boron nitride phases and phase boundaries.pdf (2.22 MB)

Cubic and hexagonal boron nitride phases and phase boundaries

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journal contribution
posted on 2024-02-16, 15:35 authored by Abhijit Biswas, Gustavo A. Alvarez, Manoj TripathiManoj Tripathi, Jonghoon Lee, Tymofii S. Pieshkov, Chenxi Li, Bin Gao, Alan DaltonAlan Dalton, et al.

Phase stability of boron nitride (BN) polymorphs at elevated temperature is perplexing due to their complex nucleation and growth kinetics, nevertheless, holds great significance in fundamental science and technology. Therefore, the phase-transformation of three-dimensional cubic BN (3D c-BN) to a two-dimensional hexagonal BN (2D h-BN) or vice versa, remains an exciting domain to explore. Here, we used temperature-dependent spark plasma sintering on 3D c-BN, enabling phase transformations to a mixed phase of 3D/2D c-BN/h-BN material and ultimately to 2D h-BN. The phase transformed 2D h-BN ceramic features an extremely high density reaching ∼90% of the theoretical limit, and exhibits excellent room temperature thermal conductivity and mechanical properties. Our findings provide valuable fundamental insights into the complex phase diagram, the relative stability regimes and boundaries of 3D c-BN and 2D h-BN phase, with the exhibition of functional properties, pivotal for extreme environments sustainable material-based technology.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Journal of Materials Chemistry C

ISSN

2050-7526

Publisher

RSC

Department affiliated with

  • Physics and Astronomy Publications

Institution

University of Sussex

Full text available

  • Yes

Peer reviewed?

  • Yes