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An Edge-Enhancing Crystal Growth Instability Caused by Structure-Dependent Attachment Kinetics

Libbrecht, Kenneth G. (2012) An Edge-Enhancing Crystal Growth Instability Caused by Structure-Dependent Attachment Kinetics. , Pasadena, CA. (Submitted) https://resolver.caltech.edu/CaltechAUTHORS:20121010-075243372

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Abstract

We describe a novel crystal growth instability that enhances the development of thin edges, promoting the formation of plate-like or hollow columnar morphologies. This instability arises when diffusion-limited growth is coupled with structure-depdendent attachment kinetics, specifically when the nucleation barrier on a facet surface decreases substantially as the facet width approaches atomic dimensions. Experimental data are presented confirming the presence of this instability in the growth of ice from water vapor at -15 C. We believe this edge-enhancing effect plays an important role in determining the growth morphologies of atmospheric ice crystals as a function of temperature, a phenomenon that has been essentially unexplained for over 75 years. Our model of structure-dependent attachment kinetics appears to be related to surface melting, and thus may be present in other material systems, whenever crystal growth from the vapor phase occurs near the material melting point.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1209.4932arXivUNSPECIFIED
ORCID:
AuthorORCID
Libbrecht, Kenneth G.0000-0002-8744-3298
Record Number:CaltechAUTHORS:20121010-075243372
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20121010-075243372
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34806
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Oct 2012 19:25
Last Modified:26 Nov 2019 11:15

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