Unusual growth macrolayers on {100} faces of diamond crystals from magnesium-based systems

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Abstract

We studied unusual growth macrolayers on the {100} faces of diamond crystals grown in Mg-C and Mg0.9Ge0.1-C systems at 7.0 GPa and in the temperature range of 1800–1900 °C. The layers were shaped as rectangles highly elongated in one of the [110] directions. The layer elongation (length to width ratio) was different, but did not exceed 23. We found that the ends of the macrolayers in most cases were composed of {111} microfacets, and their growth occurred by layers along these microfacets. Using selective etching, we found that the macrolayers were not associated with outcrops of dislocations and any planar defects on the {100} faces. It is supposed that the formation of these highly elongated layers occurs by two-dimensional nucleation that becomes possible at high carbon supersaturation under conditions of kinetically limited diamond growth in Mg-based systems.

Original languageEnglish
Pages (from-to)76-82
Number of pages7
JournalJournal of Crystal Growth
Volume455
DOIs
Publication statusPublished - 1 Dec 2016

Keywords

  • A1.Crystal morphology
  • A1.Etching
  • A2.Single crystal growth
  • B1.Diamond

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