Micro-sectoriality in hydrothermally grown ruby crystals: the internal structure of the boundaries of the growth sectors
| Autor: | Pavel N. Gavryushkin, Aleksander Rečnik, Rudolf I. Mashkovtsev, Dmitry A. Fursenko, Sergey Demin, Goran Dražić, Victor G. Thomas, Nina Daneu, Sandra Drev |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Internal pressure Corundum 02 engineering and technology General Chemistry engineering.material 010502 geochemistry & geophysics 021001 nanoscience & nanotechnology Condensed Matter Physics Epitaxy 01 natural sciences Crystal Crystallography engineering General Materials Science 0210 nano-technology 0105 earth and related environmental sciences |
| Zdroj: | CrystEngComm. 19:6594-6601 |
| ISSN: | 1466-8033 |
| DOI: | 10.1039/c7ce01520h |
| Popis: | 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) 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 (012) 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. |
| Databáze: | OpenAIRE |
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