Abstract
Two-dimensional growth ofBaB2O4single 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 velocityυshow that both V andυfluctuate by up to 40∼50% 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 4∼5 seconds) is obtained for relatively rapid growth, which is triggered by the periodical alteration of step propagating directions.
Highlights
Fluctuations of growth rate with time typically result in compositional and structural variations in crystals which inevitably deteriorate the crystal qualities
Almost all the investigations about the intrinsic fluctuation of crystal growth rate were performed under low-temperature conditions
The majority of previous studies dealt with the fluctuations of growth rates in the time scale of minutes or hours
Summary
Fluctuations of growth rate with time typically result in compositional and structural variations in crystals which inevitably deteriorate the crystal qualities. Some recent researches have proved that the fluctuation of growth rate occurs even with constant conditions, which may be an intrinsic characteristic of crystal growth [1,2,3,4]. Almost all the investigations about the intrinsic fluctuation of crystal growth rate were performed under low-temperature conditions. The majority of previous studies dealt with the fluctuations of growth rates in the time scale of minutes or hours. The aim of this paper is to visualize the profile of the solid-liquid interface during BBO crystal growth in real time focusing on the problem of growth rate fluctuation in the time scale of seconds, as well as the instability of interfacial morphology
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