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Issue 44, 2017
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Micro-sectoriality in hydrothermally grown ruby crystals: the internal structure of the boundaries of the growth sectors

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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 (01[1 with combining macron][2 with combining macron]) 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 (01[1 with combining macron]2) 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.

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

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Publication details

The article was received on 21 Aug 2017, accepted on 03 Oct 2017 and first published on 04 Oct 2017


Article type: Paper
DOI: 10.1039/C7CE01520H
Citation: CrystEngComm, 2017,19, 6594-6601
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    Micro-sectoriality in hydrothermally grown ruby crystals: the internal structure of the boundaries of the growth sectors

    V. G. Thomas, N. Daneu, A. Rečnik, R. I. Mashkovtsev, G. Dražić, S. Drev, S. P. Demin, P. N. Gavryushkin and D. A. Fursenko, CrystEngComm, 2017, 19, 6594
    DOI: 10.1039/C7CE01520H

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