Инд. авторы:	Seryotkin Y.V.
Заглавие:	Evolution of the bikitaite structure at high pressure: A single-crystal X-ray diffraction study
Библ. ссылка:	Seryotkin Y.V. Evolution of the bikitaite structure at high pressure: A single-crystal X-ray diffraction study // Microporous and Mesoporous Materials. - 2016. - Vol.226. - P.415-423. - ISSN 1387-1811. - EISSN 1873-3093.
Внешние системы:	WoS: 000456639300017; SCOPUS: 2-s2.0-85054297744; РИНЦ: 38646068; DOI: 10.1016/j.micromeso.2016.02.021; WoS: 000373419400049; SCOPUS: 2-s2.0-84959421851; РИНЦ: 26980017;
Реферат:	eng: The structural evolution of natural bikitaite Li-2(H2O)(2)[Al2Si4O12], compressed in penetrating (water containing) medium up to 4 GPa, was studied using single-crystal X-ray diffraction data from a diamond anvil cell. A nearly isotropic compression of bikitaite up to 1.2 GPa proceeds through a slight decrease of the framework T-O-T angles. Further pressurizing leads to anisotropic compression: the compressibility of b-axis is half as smaller compared to c-axis, and the a-axis is the least compressible. The structure can be described as hexagonal sheets of six-membered rings parallel to (001), connected by pyroxene-like chains. Upon the compression, the hexagonal sheets approach each other, leading to the shortening of the c-parameter. The deformation of hexagonal sheets, reinforced by O-Li bonds, is defined by the corrugation of 6-membered rings. The deformation of more flexible pyroxene chains, responding to the deformation of hexagonal sheets, consists of axial rotation of tetrahedra with only minor change in T-O-T angles. The arrangement of extraframework species changed slightly. The system of H-bonds between water molecules remains intact upon pressurizing. At the same time, the formation of new H-bonds with framework O-atoms becomes possible above 2 GPa due to the shortening of the distances between O-w positions and framework O-atoms. All pressure-induced structural changes are completely reversible and the recovered crystal structure returns to its ambient structure. The results clearly demonstrate the absence of pressure-induced hydration in the bikitaite structure. The pressure-induced changes in the unit cell metrics are similar for bikitaite compressed in water containing medium, silicon oil, and glycerol. (C) 2016 Elsevier Inc. All rights reserved.
Ключевые слова:	EDINGTONITE; COMPRESSIBILITY; WATER; OVER-HYDRATION; SELF-DIFFUSION; ZEOLITE BIKITAITE; NEUTRON-DIFFRACTION; SYNCHROTRON POWDER DIFFRACTION; Compressibility; High pressure; Crystal structure; Single-crystal X-ray diffraction; Bikitaite; Zeolite; ELASTIC BEHAVIOR; THOMSONITE;
Издано:	2016
Физ. характеристика:	с.415-423
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