With numerical simulations of the mW model of water, we investigate the energetic stability of crystalline clusters both for Ice I (cubic and hexagonal ice) and for the metastable Ice 0 phase as a function of the cluster size. Under a large variety of forming conditions, we find that the most stable cluster changes as a function of size: at small sizes, the Ice 0 phase produces the most stable clusters, while at large sizes, there is a crossover to Ice I clusters. We further investigate the growth of crystalline clusters with the seeding technique and study the growth patterns of different crystalline clusters. While energetically stable at small sizes, the growth of metastable phases (cubic and Ice 0) is hindered by the formation of coherent grain boundaries. A fivefold symmetric twin boundary for cubic ice, and a newly discovered coherent grain boundary in Ice 0, promotes cross nucleation of cubic ice. Our work reveals that different local structures can compete with the stable phase in mW water and that the low energy cost of particular grain boundaries might play an important role in polymorph selection.
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28 July 2019
Research Article|
July 29 2019
Crystalline clusters in mW water: Stability, growth, and grain boundaries
Special Collection:
Chemical Physics of Supercooled Water
Fabio Leoni;
Fabio Leoni
a)
1
School of Mathematics, University of Bristol
, Bristol BS8 1TW, United Kingdom
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Rui Shi
;
Rui Shi
b)
2
Department of Fundamental Engineering, Institute of Industrial Science, University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Hajime Tanaka
;
Hajime Tanaka
c)
2
Department of Fundamental Engineering, Institute of Industrial Science, University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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John Russo
John Russo
d)
1
School of Mathematics, University of Bristol
, Bristol BS8 1TW, United Kingdom
2
Department of Fundamental Engineering, Institute of Industrial Science, University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Note: This paper is part of a JCP Special Topic on Chemical Physics of Supercooled Water.
J. Chem. Phys. 151, 044505 (2019)
Article history
Received:
April 20 2019
Accepted:
July 01 2019
Citation
Fabio Leoni, Rui Shi, Hajime Tanaka, John Russo; Crystalline clusters in mW water: Stability, growth, and grain boundaries. J. Chem. Phys. 28 July 2019; 151 (4): 044505. https://doi.org/10.1063/1.5100812
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