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Step bunching in potassium dihydrogen phosphate crystal growth: Phenomenology

Published online by Cambridge University Press:  31 January 2011

N. A. Booth ,
A. A. Chernov  and
P. G. Vekilov
N. A. Booth*
Affiliation:
Department of Chemical Engineering, University of Houston, Houston, Texas 77204–4004
A. A. Chernov
Affiliation:
Universities Space Research Association, 4950 Corporate Drive, Suite 100,Huntsville, Alabama 35806
P. G. Vekilov
Affiliation:
Department of Chemical Engineering, University of Houston, Houston, Texas 77204–4004
*
a)Address all correspondence to this author.nbooth@mail.uh.edu
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Abstract

We have developed a real-time phase-shifting interferometer capable of imaging interfacial morphology with a depth resolution of approximately 25 Å, with a lateral resolution of approximately 0.5 μm across a field of view of 2 × 2mm2, and with time resolution of 0.1 s. The method is applied in situ to the (101) face of potassium dihydrogen phosphate crystals growing from an aqueous solution. We image the formation and evolution of solution-flow-induced step bunches and determine their characteristic wavelength to be λc = 45 μm. This wavelength is within the range predicted by a stability theory on the basis of the balance between the diffusion interaction between steps and capillarity. The value of λc suggests that step–step interactions are the likely major factor for instability.

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Articles
Information
Journal of Materials Research , Volume 17 , Issue 8 , August 2002 , pp. 2059 - 2065
Copyright
Copyright © Materials Research Society 2002

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