Инд. авторы:	Goryainov S.V., Krylov A.S., Vtyurin A.N., Pan Y.M.
Заглавие:	Raman study of datolite CaBSiO4(OH) at simultaneously high pressure and high temperature
Библ. ссылка:	Goryainov S.V., Krylov A.S., Vtyurin A.N., Pan Y.M. Raman study of datolite CaBSiO4(OH) at simultaneously high pressure and high temperature // Journal of Raman Spectroscopy. - 2015. - Vol.46. - Iss. 1. - P.177-181. - ISSN 0377-0486. - EISSN 1097-4555.
Внешние системы:	DOI: 10.1002/jrs.4614; SCOPUS: 2-s2.0-84921673284; WoS: 000348501500026;
Реферат:	eng: Using an in situ method of Raman spectroscopy and resistance-heated diamond anvil cell, the system datolite CaBSiO4(OH) - water has been investigated at simultaneously high pressure and temperature (up to ? similar to 5GPa and ? similar to 250 degrees C). Two polymorphic transitions have been observed: (1) pressure-induced phase transition or the feature in pressure dependence of Raman band wavenumbers at P=2GPa and constant T=22 degrees C and (2) heating-induced phase transition at T similar to 90 degrees C and P similar to 5GPa. The number of Raman bands is retained at the first transition but changed at the second transition. The first transition is mainly distinguished by the changes in the slopes of pressure dependence of Raman peaks at 2GPa. The second transition is characterized by several strong changes: the wavenumber jumps of major bands, the merging of strong doublets at 378 and 391cm(-1) (values for ambient conditions), the splitting of the intermediate-intensity band at 292cm(-1), and the transformation of some low-wavenumber bands at 160-190cm(-1). No spectral and visual signs of overhydration and amorphization have been observed. No noticeable dissolution of datolite in the water medium occurred at 5GPa and 250 degrees C after 3h, which corresponds to typical conditions of the cold' zones of slab subduction. Copyright (c) 2014 John Wiley & Sons, Ltd.
Ключевые слова:	BEHAVIOR; MINERALS; REFINEMENT; SPECTROSCOPY; HYDROGEN-BOND; CRYSTAL-STRUCTURE; DENSITY; diamond anvil cell; high temperature; high pressure; datolite; Raman spectra; X-RAY-DIFFRACTION;
Издано:	2015
Физ. характеристика:	с.177-181