Effect of the solvent-catalyst composition on diamond crystallization in the Mg-Ge-C system

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Abstract

Crystallization of diamond in the Mg-Ge-C system has been studied at 7.5 GPa and 1800 °C with the catalyst composition ranging from pure Mg to pure Ge. It is found that with increasing Ge content of the solvent-catalyst, the degree of graphite-to-diamond conversion gradually decreases from 92 to 16%, which is a consequence of the low solubility of carbon in the germanium melt. A decrease in the Mg/Ge ratio leads to a change in the diamond growth form from cube to octahedron and a drastic increase in the number of diamond nucleation centers. The spectral properties of the crystallized diamonds are studied by photoluminescence techniques. The correlations between the Ge content of the Mg-Ge-C system and the luminescence characteristics of the diamond crystals caused by the germanium-vacancy, silicon-vacancy, and nitrogen-vacancy optical centers are established. The results obtained in this study demonstrate that by changing the catalyst composition in the Mg-Ge-C system, it is possible to control the design of the diamond crystals and synthesize isometric, pyramidal, prismatic or needle-like crystals containing Ge-V centers.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalDiamond and Related Materials
Volume89
DOIs
Publication statusPublished - 1 Oct 2018

Keywords

  • Defect characterization
  • High pressure high temperature (HPHT)
  • Impurities
  • Optical properties
  • Solvent-catalysts
  • Synthetic diamond
  • VACANCY COLOR-CENTER
  • HIGH-PRESSURE
  • DEFECTS
  • SPINS
  • CENTERS
  • MORPHOLOGY

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