Study of the complex vibrational spectra of natural zeolite chabazite

Pechar, F.; Rykl, D.

doi:10.1016/0144-2449(83)90178-1

Cited by 18 publications

(11 citation statements)

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“…[10,11] On the other hand, optical modes of the lattice vibrations are observed at low frequencies below 340 cm À1 in…”

Section: Resultsmentioning

confidence: 98%

“…[10,13] Table 1. The intensity of the helical 8-ring band relative to that of the 4-ring band in both the Raman and IR spectra for Ag-NAT is similar to that of Na-NAT, but very different from the rest of the ion-exchanged natrolites studied here.…”

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confidence: 99%

“…Na- [10] [ . Clearly, the charge of the EFC plays an important role, as the data point of Ag + -NAT fits onto the curve derived from the monovalent alkali-metal-exchanged natrolites, whereas those from the alkaline-earth/heavy-metal-exchanged natrolites clearly deviate from this curve.…”

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confidence: 99%

“…Peak positions of all the observed far-and mid-IR vibrational modes of the alkaline-earth-and heavy-metal-exchanged natrolites (X-NAT-hyd) under ambient conditions. Na- [10] […”

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confidence: 99%

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Spectroscopic and Computational Characterizations of Alkaline‐Earth‐ and Heavy‐Metal‐Exchanged Natrolites

Liú¹,

Chen²,

Liu³

et al. 2014

ChemPlusChem

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Synchrotron infrared (IR) and micro‐Raman spectra of natrolites containing alkaline‐earth ions (Ca2+, Sr2+, and Ba2+) and heavy metals (Cd2+, Pb2+, and Ag+) as extra‐framework cations (EFCs) were measured under ambient conditions. Complementing our previous spectroscopic investigations of natrolites with monovalent alkali metal (Li+, Na+, K+, Rb+, and Cs+) EFCs, we establish a correlation between the redshifts of the frequencies of the 4‐ring and helical 8‐ring units and the size of the EFCs in natrolite. Through ab initio calculations we have derived structural models of Ca2+‐ and Ag+‐exchanged natrolites with hydrogen atoms, and found that the frequency shifts in the HOH bending mode and the differences in the OH stretching vibration modes can be correlated with the orientations of the water molecules along the natrolite channel. Assuming that the members of a solid solution series behave as an ideal mixture, we will be able to use spectroscopy to probe compositions. Deviation from ideal behavior might indicate the occurrence of phase separation on various length scales.

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“…[10,11] On the other hand, optical modes of the lattice vibrations are observed at low frequencies below 340 cm À1 in…”

Section: Resultsmentioning

confidence: 98%

mentioning

confidence: 99%

mentioning

confidence: 99%

“…Peak positions of all the observed far-and mid-IR vibrational modes of the alkaline-earth-and heavy-metal-exchanged natrolites (X-NAT-hyd) under ambient conditions. Na- [10] […”

mentioning

confidence: 99%

See 2 more Smart Citations

Spectroscopic and Computational Characterizations of Alkaline‐Earth‐ and Heavy‐Metal‐Exchanged Natrolites

Liú¹,

Chen²,

Liu³

et al. 2014

ChemPlusChem

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“…First, it cannot be a single tetrahedron, because such units are present in all the structures of silicates and aluminosilicates, not only in zeolites. Unit cell is also not useful, because its size can be up to hundreds of atoms [4]. While, systems of tetrahedra forming so-called Secondary Building Units (SBU), such as single and double rings, can be such model units.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental study of ion-exchange process on zeolites from 5-1 structural group

2015

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Inelastic Neutron Scattering Studies of Water in Natural Zeolites

Fueß

Stuckenschmidt

Schweiss

1986

Ber Bunsenges Phys Chem

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Diffusion / Neutron Scattering / Transport PropertiesResults on the motion of water molecules in six natural zeolites (natrolite, phillipsite, harmotome, heulandite, stilbite and chabazite) from incoherent inelastic neutron scattering are presented. The spectra for five zeolite samples exhibit broad maxima and few resolved peaks. Only for natrolite with water molecules tightly bound to the alumosilicate framework a spectrum with well-resolved peaks is observed. A detailed interpretation is attempted for the Ba-zeolite harmotome where data were recorded at various temperatures and different amount of water. -Differential scanning calorimetry gave a broad dehydration peak for chabazite (T = 443 K) and a sharp single peak for natrolite ( T = 633 K), whereas three maxima (T = 433, 523 and 673 K) were observed for harmotome.

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Study of the complex vibrational spectra of natural zeolite chabazite

Cited by 18 publications

References 0 publications

Spectroscopic and Computational Characterizations of Alkaline‐Earth‐ and Heavy‐Metal‐Exchanged Natrolites

Spectroscopic and Computational Characterizations of Alkaline‐Earth‐ and Heavy‐Metal‐Exchanged Natrolites

Theoretical and experimental study of ion-exchange process on zeolites from 5-1 structural group

Inelastic Neutron Scattering Studies of Water in Natural Zeolites

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