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.

中文翻译：

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水热生长红宝石晶体的微观固定性：生长区域边界的内部结构

这项研究探索了在非奇异取向（01 ）种子上水热生长的红宝石晶体中生长微扇区之间边界的精细结构细节。使用红外光谱和HRTEM分析对样品进行了检查，表明微区的界面充当了经常在生长的晶体中观察到的OH基团的“陷阱”。与先前报道相反的是，这些OH-基团中有很大一部分以有序的方式结合到红宝石晶体中，形成刚玉外延生长的diaspore-like层（012）晶格平面。微扇区之间的边界上的张力导致内部压力的局部增加，从而使类渗铝样相变得稳定。假设本文讨论的机理可以解释在名义上无水矿物（例如与刚玉类似的MgSiO ₃（裸铁矿））结构中OH-基团的出现。