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Experimental Growth of New 6-fold Symmetry Patterned Microcrystals of AlN: Equilibrium Structures and Growth Mechanism

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    Experimental Growth of New 6-fold Symmetry Patterned Microcrystals of AlN: Equilibrium Structures and Growth Mechanism
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    ‡ †RASOM and ‡Graduate School of Energy Science and Technology, Chungnam National University, 79 Daehak-ro, Yuseong-gu, Daejeon 305-764, Republic of Korea
    ∥ §Integrated Science and Engineering Division, and ∥Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, Republic of Korea
    *E-mail: address:[email protected]. Tel: 82-2-2123-5759.
    *E-mail: [email protected]. Tel: 82-42-821-6596.
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    Crystal Growth & Design

    Cite this: Cryst. Growth Des. 2016, 16, 9, 5305–5311
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    https://doi.org/10.1021/acs.cgd.6b00829
    Published July 19, 2016
    Copyright © 2016 American Chemical Society
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    Abstract

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    For the first time, we experimentally detected the formation of 6-fold symmetry patterned microcrystals of AlN (aluminum nitride), such as simple prisms, stellar and sectored plates, and stellar and fernlike stellar dendrites. These crystals were formed during combustion of a solid mixture of Al + kAlF3 (k = 0.05–0.1 mol) under a nitrogen atmosphere (PN2 = 2.5 MPa). The combustion temperature recorded with a thermocouple was in the 1700–1900 °C range. We examined the physical mechanisms governing the formation of AlN crystals, and we treated this problem as a case study of the dynamics of crystal growth from the liquid phase. Particular attention was given to the basic theoretical understanding of the subject, utilizing first-principles density functional theory calculations. The Wulff construction method was applied to identify equilibrium structures of nano- and microscale AlN crystals. Energy minimization arguments were used to show that certain crystal planes of AlN are more probable than others, giving the crystal 6-fold symmetry. The integrated experiments and computations form the basis for our proposal of the underlying mechanisms for nucleation and growth of the AlN crystals.

    Copyright © 2016 American Chemical Society

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    This article is cited by 19 publications.

    1. Hayk H. Nersisyan, Wan Bae Kim, Seong Hun Lee, Bung Uk Yoo, Hyuk Choi, Hyun You Kim, Jong Hyeon Lee. Control and Theoretical Modeling of the Growth Process of AlN Six-fold and Multifold Armed Dendritic Crystals. Crystal Growth & Design 2019, 19 (6) , 3244-3252. https://doi.org/10.1021/acs.cgd.9b00099
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    10. D V Alexandrov, P K Galenko. Thermo-solutal growth of an anisotropic dendrite with six-fold symmetry. Journal of Physics: Condensed Matter 2018, 30 (10) , 105702. https://doi.org/10.1088/1361-648X/aaab7b
    11. Dmitri V. Alexandrov, Peter K. Galenko, Lyubov V. Toropova. Thermo-solutal and kinetic modes of stable dendritic growth with different symmetries of crystalline anisotropy in the presence of convection. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 2018, 376 (2113) , 20170215. https://doi.org/10.1098/rsta.2017.0215
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    13. L. V. Toropova. On the theory of stable mode of dendritic growth in the case of convective heat and mass transport at the solid-liquid interface. 2018, 020103. https://doi.org/10.1063/1.5055176
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    16. D. V. Alexandrov, P. K. Galenko. Selected mode of dendritic growth with n-fold symmetry in the presence of a forced flow. EPL (Europhysics Letters) 2017, 119 (1) , 16001. https://doi.org/10.1209/0295-5075/119/16001
    17. H. H. Nersisyan, J. H. Lee. SHS as a new approach to synthesizing hierarchical inorganic structures. International Journal of Self-Propagating High-Temperature Synthesis 2017, 26 (3) , 210-220. https://doi.org/10.3103/S1061386217030050
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    19. Hayk H. Nersisyan, Seong Hun Lee, Jeong Hun Choi, Bung Uk Yoo, Tae-Hyuk Lee, Hoyoung Suh, Jin-Gyu Kim, Jong Hyeon Lee. Tailoring the morphology of AlN: from 6-fold patterned crystals to multilayer hierarchical structures. CrystEngComm 2017, 19 (31) , 4489-4496. https://doi.org/10.1039/C7CE01199G
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    Crystal Growth & Design

    Cite this: Cryst. Growth Des. 2016, 16, 9, 5305–5311
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.cgd.6b00829
    Published July 19, 2016
    Copyright © 2016 American Chemical Society
    Request reuse permissions

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