AlN nucleation and spontaneous pattern formation via combustion of an Al-C-AlF3 mixture in nitrogen

•AlN crystals of various morphology are obtained by combustion of Al-kC-AlF3-N2 mixture.•The crystals are micro- and nanoplates, dodecagons and six-armed hexagons.•Three chemical pathways for AlN crystals formation are highlighted.•The observed microstructures are validated by a 2D phase-field model...

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Bibliographic Details
Published in:Journal of crystal growth 2021-04, Vol.560-561, p.126044, Article 126044
Main Authors: Nersisyan, Hayk H., Huynh, Thanh Nam, Park, Kyoung Tae, Hong, Soon-Jik, Lee, Jong Hyeon
Format: Article
Language:English
Subjects:
A1. Crystal morphology
A1. Nucleation
A2. Growth from melt
Aluminum fluorides
B1. Nitrides
Combustion
Hexagons
Nucleation
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Summary:•AlN crystals of various morphology are obtained by combustion of Al-kC-AlF3-N2 mixture.•The crystals are micro- and nanoplates, dodecagons and six-armed hexagons.•Three chemical pathways for AlN crystals formation are highlighted.•The observed microstructures are validated by a 2D phase-field model. The nucleation and spontaneous pattern formation of AlN via the combustion of Al- kC-AlF3 mixtures (k is mol of C) in nitrogen is investigated. The formation of 2D AlN hexagonal facet micro- and nanoplates, dodecagon-type AlN crystals, and six-wing hexagons is highlighted. Phase-field simulation in 2D-space is applied to interpret and/or anticipate the growth mechanisms of such crystals in limited space.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2021.126044