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

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 (01–1–2) seed. The samples were examined using IR-spectroscopy and HRTEM-analysis, demonstrating that these interfaces of the mi-cro-sectors serve as ‘traps’ for the OH-groups often observed in grown crystals. Counter to what has previously been reported, a significant proportion of these OH-groups is incorporated in ruby crystals in an orderly manner, forming diaspore-like layers growing epitaxially on the corundum (01–12) lattice planes. The tensions on the boundaries between the micro-sectors result to local increase of an internal pressure, making diaspore-like phase is 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.

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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, Accepted Manuscript
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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. Dražič, S. Drev, S. P. Demin, P. Gavryushkin and D. A. Fursenko, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01520H

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