Инд. авторы:	Likhacheva A.Y., Prasad P.S.R., Sarma D.S., Goryainov S.V.
Заглавие:	High-temperature Raman study of methane-rich melanophlogite up to 1000 °C: The framework stability on degassing
Библ. ссылка:	Likhacheva A.Y., Prasad P.S.R., Sarma D.S., Goryainov S.V. High-temperature Raman study of methane-rich melanophlogite up to 1000 °C: The framework stability on degassing // Microporous and Mesoporous Materials. - 2018. - Vol.266. - P.149-154. - ISSN 1387-1811. - EISSN 1873-3093.
Внешние системы:	DOI: 10.1016/j.micromeso.2018.02.029; РИНЦ: 35496817; SCOPUS: 2-s2.0-85042935433; WoS: 000433644600019;
Реферат:	eng: The high-temperature behavior of CH4-rich melanophlogite (MEP) from Mt. Hamilton was studied by Raman spectroscopy within the range of 30–1000 °C. This study aimed to characterize the vibrational properties of the host framework and the guest CH4 molecules and elucidate how much the framework structure is damaged upon degassing. The jump-like shifts of the lattice Raman bands observed at 80 °C correspond to the α-β transition in MEP. Negative ν/T dependencies of the lattice bands and minor positive ν/T trends of the stretching C-H modes within the range of 100–400 °C correlate with the volume expansion in β-MEP observed previously. Start from 700 °C, corresponding to the onset of degassing, the transition to the stable silica phases (quartz, tridymite, cristobalite) and a progressive loss of the local order in the MEP framework is observed. A strong correlation between the framework degradation and the degree of degassing emphasizes the stabilizing role of the guest CH4 molecules for the MEP structure. The degassing process appears to have a destructive effect onto the MEP framework. The fully degassed MEP is characterized by the local-scale amorphization, but, according to the X-ray diffraction data, the far-order structure is essentially preserved, which is perhaps a specificity of rigid silica frameworks. © 2018
Ключевые слова:	Guest CH4; High temperature; Melanophlogite; Raman spectroscopy; Degassing; Silica; X-ray diffraction data; Vibrational properties; Melanophlogite; High temperature; Guest CH4; Framework structures; Framework stabilities; X ray diffraction; Silicate minerals; Raman spectroscopy; Molecules; High temperature behavior; Degassing;
Издано:	2018
Физ. характеристика:	с.149-154
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