Possible burst-like facet growth mode at high temperatures

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• 作者：Davorin Lovrić ; Zlatko Vu&#x10d ; ić ; Jadranko Gladić
• 关键词：A1. Diffusion ; A1. Growth models ; A1. Nucleation ; A1. Supersaturation ; A2. Single-crystal growth ; B2. Superionic conductors
• 刊名：Journal of Crystal Growth
• 出版年：2008
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：1 July 2008
• 卷：310
• 期：14
• 页码：3391-3397
• 文件大小：1470 K

摘要

A decade ago, a burst-like growth mode of c-facets of ⁴He crystals growing at mK temperatures, characterized by the alternation of time intervals during which the facet does not advance with the intervals of its fast advancement, was found [J.P. Ruutu, P.J. Hakonen, A.V. Babkin, A.Y. Parshin, J.S. Penttilä, J.P. Saramäki, G. Tvalashvili, Phys. Rev. Lett. 76 (1996) 4187]. We investigate the possibility that a similar facet growth mode exists for facets at high growth temperatures. We have applied the digital laser interferometry for monitoring facet kinetics of spherical copper selenide single crystals during their growth at constant volume growth rate around 800 K. Our analysis of directly measured (1 1 1) facet advancement curves has revealed that they consist of time intervals during which the facet does not advance vertically alternating with the time intervals of enhanced growth, resembling the burst-like facet growth mode. The results are discussed in terms of the enhancement of the local supersaturation induced by the existence of nucleation barrier.