Laser Raman polarization spectra of natural zeolite-natrolite

Pechar, F.; Gregora, I.; Rykl, D.

doi:10.1135/cccc19813043

Cited by 12 publications

(5 citation statements)

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“…For calcite, there are basically five Raman bands at ambient conditions. The most intense band is the A 1 g mode at 1085 cm −l . Two sets of doubly degenerate internal E g modes are observed at 712 and 1434 cm −l , and the external E g or lattice modes occur at 282 and 156 cm ‐l .…”

Section: Resultsmentioning

confidence: 95%

“…The most intense band is the A 1 g mode at 1085 cm Àl . 47,48 Two sets of doubly degenerate internal E g modes are observed at 712 and 1434 cm Àl , and the external E g or lattice modes occur at 282 and 156 cm -l . The external modes are associated with librations of the carbonate ions in the primitive cell around axes normal to the C 3 axis and translations of the CO 3 2ions normal to the C 3 axis, respectively.…”

Section: Confocal Micro-raman Spectroscopymentioning

confidence: 99%

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A Preliminary Investigation of the ISG Glass Vapor Hydration

Abdelouas

Mendili

Chaou

et al. 2013

Int J of Appl Glass Sci

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During the geological disposal of high-level waste, the nuclear glass is expected to be first hydrated in water vapor prior to liquid alteration. In the present work, we investigated the vapor hydration of the International simple glass (ISG) at 175°C and different relative humidities (60%, 80% and 98%). The glass hydration was investigated by nuclear reaction analysis (NRA) and Fourier transform infra-red spectroscopy. The chemical and mineralogical compositions of the alteration products were studied using scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM-EDS) and μ-Raman spectroscopy, respectively. The NRA results gave water diffusion coefficients of 2.31-7.34 × 10−21 m2/s, in good agreement with the literature data on borosilicate glasses altered in aqueous media. The glass hydration increased with relative humidity percentage and the SEM-EDS analysis showed a slight enrichment in Si and loss of Na in the hydrated glass layer compared with the pristine glass. The hydration rate of the ISG glass was little higher than that of the French SON68 glass hydrated using water vapor. The corrosion products were analcime, tobermorite, and calcite, which were typical of the SON68 glass hydrated in similar conditions

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Section: Resultsmentioning

confidence: 95%

Section: Confocal Micro-raman Spectroscopymentioning

confidence: 99%

A Preliminary Investigation of the ISG Glass Vapor Hydration

Abdelouas

Mendili

Chaou

et al. 2013

Int J of Appl Glass Sci

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“…All water molecules occupy sites W(1). The polarized Raman spectra of natrolite were obtained and interpreted by factor-group analysis taking into account symmetry and LO--TO splitting of bands (Pechar et al 1981;Goryainov and Shebanin 1985).…”

Section: Experimental Technique and Materialsmentioning

confidence: 99%

Raman spectroscopy of water tracer diffusion in zeolite single crystals

Goryaĭnov

Belitsky

1995

Phys Chem Minerals

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Abstract.The water tracer diffusion in single crystals of natrolite, scolecite, mesolite, heulandite, and chabazite has been studied by Raman micro-spectroscopy. A model of water tracer diffusion is proposed. The H20, HDO, and D20 molecule concentrations are calculated for a crystal of orthorhombic symmetry on deuteration of the initial H20-sample. A way is shown to find the diffusion coefficients, the constant of equilibrium, and the deuteron-proton exchange rate from experimental data.The water diffusion coefficients for natrolite placed in liquid D20 appeared to be 1.5-2 times higher than those for a sample in vaporous D20. For natrolite at room temperature, 1.5-1.6 times higher water diffusion occurs along [001] than along [110].

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“…Each channel contains two parallel chains of water and Na + cations. Group theory predicts − the following irreducible representations of phonon vibrational modes of natrolite at the Brillouin zone center ( q = 0) with a space group C 2 v Γ = 120 A 1 ( IR, R ) + 120 A 2 ( R ) + 120 B 1 ( IR, R ) + 120 B 2 ( IR, R ) in which IR and R denote infrared and Raman activity, respectively.…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic Study of the Effects of Pressure Media on High-Pressure Phase Transitions in Natrolite

et al. 2010

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Structural phase transitions in natrolite have been investigated as a function of pressure and different hydrostatic media using micro-Raman scattering and synchrotron infrared (IR) spectroscopy. Natrolite undergoes two reversible phase transitions at 0.86 and 1.53 GPa under pure water pressure medium. These phase transitions are characterized by the changes in the vibrational frequencies of four-and eight-membered rings related to the variations in the bridging T-O-T angles and the geometry of the elliptical eight-ring channels under pressure. Concomitant to the changes in the framework vibrational modes, the number of the O-H stretching vibrational modes of natrolite changes as a result of the rearrangements of the hydrogen bonds in the channels caused by a successive increase in the hydration level under hydrostatic pressure. Similar phase transitions were also observed at relatively higher pressures (1.13 and 1.59 GPa) under alcohol-water pressure medium. Furthermore, no phase transition was found up to 2.52 GPa if a lower volume ratio of the alcohol-water to natrolite was employed. This indicates that the water content in the pressure media plays a crucial role in triggering the pressure-induced phase transitions in natrolite. In addition, the average of the mode Gru ¨neisen parameters is calculated to be about 0.6, while the thermodynamic Gru ¨neisen parameter is found to be 1.33. This might be attributed to the contrast in the rigidity between the TO 4 tetrahedral primary building units and other flexible secondary building units in the natrolite framework upon compression and subsequent water insertion.

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Laser Raman polarization spectra of natural zeolite-natrolite

Cited by 12 publications

References 0 publications

A Preliminary Investigation of the ISG Glass Vapor Hydration

A Preliminary Investigation of the ISG Glass Vapor Hydration

Raman spectroscopy of water tracer diffusion in zeolite single crystals

Spectroscopic Study of the Effects of Pressure Media on High-Pressure Phase Transitions in Natrolite

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