1. The growth of AlN dendritic crystals with uniform morphology by an aluminum microdroplet localization approach.
- Author
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Nersisyan, Hayk H., Lee, Seong Hun, Yoo, Bung Uk, and Lee, Jong Hyeon
- Subjects
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ALUMINUM , *CRYSTALS , *CLASS A metals , *CRYSTALLOGRAPHY , *NUCLEATION - Abstract
Abstract We developed an attractive combustion approach for synthesizing uniformly shaped AlN dendritic crystals by combustion of Al + 0.1AlF 3 + k Al 2 O 3 powder mixtures in a nitrogen atmosphere. The combustion temperature measured for various k values was between 1650 and 1750 °C and the micro-droplets of Al formed in the beginning stages of the process were enveloped by the solid layers of Al 2 O 3 , and the subsequent multipoint nucleation and crystallization produced morphologically and size uniform dendritic crystals. We proposed a theoretical model for calculating the thickness and the number of Al 2 O 3 layers around of Al microdroplets at known concentration of Al 2 O 3. Depending on the concentration of Al 2 O 3 , these structures were simple stars with six points and stellar dendrites with multiple petals. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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