Distribution of D2O Molecules of First and Second Types in Hydrothermally Grown Beryl Crystals

M. A. Belyanchikov, P. A. Abramov, A. L. Ragozin, D. A. Fursenko, B. P. Gorshunov, V. G. Thomas

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

This article reports on the uneven distribution of water molecules of first (D2O-I) and second (D2O-II) types in a D2O-containing beryl crystal grown hydrothermally on a non-singularly oriented flat seed {5.5.10¯.6}, as identified by infrared spectroscopic studies of crystal fragments. The distribution of D2O-II molecules is very heterogeneous, and their maximal concentrations are at the boundaries of the growth sectors of micro-faces, which protrude from the surface growth front {5.5.10¯.6}. We attribute this increase in the D2O-II content to the tensions and the resulting increased internal pressure at the boundaries of the growth sectors of micro-faces. Specifically, the increased internal pressure shifts the isomorphic substitution equation in beryl SiT14+ → AlT13+ + LiR″+ to the right (T1 and R″ denote the crystal's chemical positions of cations), which triggers the D2O-I → D2O-II transformation. The number of growth sector boundaries goes down as the growth front moves, reducing the number of areas with increased internal pressure and the proportion of D2O-II/D2O-I.

Язык оригиналаанглийский
Страницы (с-по)2283-2291
Число страниц9
ЖурналCrystal Growth and Design
Том21
Номер выпуска4
DOI
СостояниеОпубликовано - 7 апр 2021

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