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Research Letters in Materials Science
Volume 2007, Article ID 61395, 5 pages
http://dx.doi.org/10.1155/2007/61395
Research Letter

Unsteady Growth of BaB2O4 Single Crystal from High-Temperature Solution

1Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
2Department of Physics, East China Normal University, Shanghai 200062, China

Received 13 August 2007; Accepted 12 November 2007

Academic Editor: Pavel Lejcek

Copyright © 2007 X. H. Pan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Two-dimensional growth of BaB2O4 single crystal from high-temperature solution was performed, and the motion of solid-liquid interface was observed in real time by differential interference microscopy. Results show that the solid-liquid interface exhibits the morphology of a vicinal face where steps with height of several microns are observed. The measurements of growth rate V and step propagating velocity υ show that both V and υ fluctuate by up to 4050% of their average values, respectively, under constant external conditions. Such intrinsic fluctuations with time interval of the order of one second is mainly the result of step bunching, which has been confirmed by the gradual decrease of step spacing when approaching the edge of the growing interface. Besides above fluctuations, a longer-period oscillation of V (period interval of 45 seconds) is obtained for relatively rapid growth, which is triggered by the periodical alteration of step propagating directions.