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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goryainov S. V., Krylov A. S., Likhacheva A.Yu., Vtyurin A. N.
Заглавие : Raman investigation of fibrous zeolites of the natrolite group at high pressures of an aqueous medium
Место публикации : Bull. Russ. Acad. Sci.: Phys. - 2012. - Vol. 76, Is. 7. - P.804-807. - ISSN 1062-8738, DOI 10.3103/S1062873812070143
Примечания : Cited References: 7
Ключевые слова (''Своб.индексиров.''): aqueous medium--high pressure--intermediate phase--intermediate phasis--raman bands--raman investigations--water molecule--xrd--raman spectroscopy--silicon--zeolites
Аннотация: The intermediate phases preceding overhydration are observed by Raman spectroscopy both in scolecite Ca[Al2Si3O10] вЂў 3H2O and in thomsonite NaCa2[Al5Si 5O20] вЂў 6H2O upon compression in an aque-ous medium. The first intermediate phase of scolecite is attributed to a phase precursor revealed earlier using XRD at pressure of ~1 GPa. The widening of the Raman bands of O-H vibrations caused by the disordering of H 2O, which appears after additional water molecules are embedded in the zeolite channels, is typical of this intermediate phase. It is assumed on the basis of the Raman spectroscopy data that scolecite contains sec-ond overhydrated and second intermediate phases. В© 2012 Allerton Press, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goryainov S. V., Krylov A. S., Vtyurin A. N., Likhacheva A. Y., Prasad P. S. R.
Заглавие : In situ Raman study of wairakite and dawsonite interaction with water at high P–T parameters
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2016. - Vol. 80, Is. 5. - P.522-524. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873816050087
Примечания : Cited References: 14. - This work was supported by the Russian Foundation for Basic Research, project nos. 14-05-00616 and 15-55-45070-IND, and the Russian Science Foundation, project no. 15-17-30012
Ключевые слова (''Своб.индексиров.''): waterworks--glass-like phase--high temperature--in-situ raman spectroscopy--phillipsite--situ raman--t parameter--water mediums--water system--zeolites
Аннотация: The behavior of wairakite CaAl2Si4O12 · 2H2O and dawsonite NaAlCO3(OH)2 in a water medium is studied by means of in situ Raman spectroscopy at the simultaneously high temperatures and pressures (up to T = 723 K and P = 1 GPa). After the initial minerals are partially dissolved, phillipsite forms in the wairakite–water system, and a glass-like phase is generated in the dawsonite–water system. These minerals show no signs of overhydration. The amorphization of the wairakite structure that occurs at high temperatures and pressures was reversible. © 2016, Allerton Press, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Borodina U., Goryainov S., Krylova S. N., Vtyurin A. N., Krylov A. S.
Заглавие : The behavior of zeolites wairakite and phillipsite at high P-T parameters
Место публикации : Spectrochim. Acta A. - 2022. - Vol. 273. - Ст.120979. - ISSN 13861425 (ISSN), DOI 10.1016/j.saa.2022.120979
Примечания : Cited References: 51
Аннотация: In situ investigation of mineral behavior in water medium at simultaneously high P-T parameters can be applied to modelling of mineral transformation processes in lithospheric plates. The behavior of zeolites wairakite and phillipsite under the P-T conditions of «cold» slab subduction, corresponding to the start of oceanic plate diving or ocean floor near geothermal sources, was studied by in situ Raman spectroscopy. During compression in water medium, phillipsite initial phase is stable up to T = 350 °C, P = 1.7 GPa and with further increase of P-T parameters, phillipsite undergoes amorphization and partially dissolves in water. Wairakite compressed in water medium has a polymorphic transformation at T ≈ 300 °C and P ≈ 0.4 GPa. At 300–450 °C and P = 1 GPa the Raman spectrum almost disappears due to the amorphization of wairakite. Zeolite wairakite partially dissolves, and other zeolite phillipsite grows out of the fluid at T = 450 °C and P = 1 GPa. This transformation indicates the higher stability of phillipsite in comparison to wairakite. The in situ observed high P-T stability of phillipsite, which does not transform to other zeolites, and its formation from wairakite may indicate ф possible widespread distribution of this zeolite in marine sediments. By using the plane-wave pseudo-potential method, ab initio DFT calculations of Raman and FTIR spectra of wairakite were carried out. Comparing theoretical and experimental spectra, interpretation of the vibrational spectra of both zeolites was suggested.
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