Инд. авторы:	Thomas V.G., Daneu N., Recnik A., Mashkovtsev R.I., Drazic G., Drev S., Demin S.P., Gavryushkin P.N., Fursenko D.A.
Заглавие:	Micro-sectoriality in hydrothermally grown ruby crystals: the internal structure of the boundaries of the growth sectors
Библ. ссылка:	Thomas V.G., Daneu N., Recnik A., Mashkovtsev R.I., Drazic G., Drev S., Demin S.P., Gavryushkin P.N., Fursenko D.A. Micro-sectoriality in hydrothermally grown ruby crystals: the internal structure of the boundaries of the growth sectors // Crystengcomm. - 2017. - Vol.19. - Iss. 44. - P.6594-6601. - ISSN 1466-8033.
Внешние системы:	DOI: 10.1039/c7ce01520h; РИНЦ: 31051017; WoS: 000415101800005;
Реферат:	eng: 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 (12) over bar) 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) over bar2) 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.
Ключевые слова:	HYDROGEN; DIASPORE; SAPPHIRE; ALPHA-AL2O3; BERYL; RUTILE; CORUNDUM; ELECTRON-DENSITY; SPECTROSCOPY; FACES;
Издано:	2017
Физ. характеристика:	с.6594-6601