Micro-sectoriality in hydrothermally grown ruby crystals: The internal structure of the boundaries of the growth sectors

Victor G. Thomas, Nina Daneu, Aleksander Rečnik, Rudolf I. Mashkovtsev, Goran Dražić, Sandra Drev, Sergey P. Demin, Pavel N. Gavryushkin, Dmitry A. Fursenko

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

This study explores the fine structural details of the boundaries between the growth micro-sectors in a ruby crystal grown hydrothermally on a nonsingularly oriented (0112) seed. The samples were examined using IR-spectroscopy and HRTEM-analysis, demonstrating that the interfaces of the micro-sectors serve as 'traps' for OH-groups often observed in grown crystals. Counter to what has previously been reported, a significant proportion of these OH-groups is incorporated into ruby crystals in an orderly manner, forming diaspore-like layers growing epitaxially on the corundum (0112) lattice planes. The tensions on the boundaries between the micro-sectors result in local increase of internal pressure, making the diaspore-like phase stable. The assumption is made that the mechanism discussed in the article can explain the occurrence of OH-groups in the structure of nominally anhydrous minerals, such as MgSiO3 (akimotoite) which is structurally similar to corundum.

Original languageEnglish
Pages (from-to)6594-6601
Number of pages8
JournalCrystEngComm
Volume19
Issue number44
DOIs
Publication statusPublished - 28 Nov 2017

Keywords

  • ELECTRON-DENSITY
  • CORUNDUM
  • RUTILE
  • SPECTROSCOPY
  • ALPHA-AL2O3
  • SAPPHIRE
  • DIASPORE
  • HYDROGEN
  • FACES
  • BERYL

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