Far infra-red absorption spectra of layer silicates

Ishii, M.; Shimanouchi, Takehiko; Nakahira, M.

doi:10.1016/s0020-1693(00)93207-9

Cited by 86 publications

(63 citation statements)

References 15 publications

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“…A considerable number of spectra in this region were obtained, but the spectra reduce to a combination of 2 or more of the illustrated spectra. The band at 134.7 cm -1 is attributed to the symmetric bending mode of the Si205 unit of halloysite (Ishii et al 1967). Some variation in the peak position is observed for this band and 2 bands are observed in the spectra of A and B.…”

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confidence: 90%

“…Other workers have simply classified the vibrations as lattice modes. The suggested assignments of the observed features given in Table 2 are based on previously published work on layer silicates (Farmer 1974;Farmer and Russell 1964;Ishii et al 1967). Figure 4 illustrates the variation in intensity of the bands in the 120 to 240 cm -1 region for a selection of different halloysite crystals.…”

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confidence: 97%

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Raman Microprobe Spectroscopy of Halloysite

Frost

Shurvell

1997

Clays and clay miner.

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Abstract--The Raman spectra of a tubular halloysite originating from Matauri Bay, New Zealand, have been obtained using a Renishaw 1000 Raman microscope system. The Raman microprobe enables the Raman spectra of crystals as small as 0.8 p~m diameter to be obtained over the complete wavelength range and allows spectral variations along the different crystal axes to be studied. Three bands in the hydroxyl stretching region were observed at 3616.5, 3623.4 and 3629.7 cm ~ and are attributed to the inner hydroxyls of the shared lower plane of the octahedral sheet of the halloysite. Two bands at 3698.2 and 3705 cm -~ were obtained for the outer hydroxyls of the unshared outer octahedral plane. The relative intensity of the 3629.7 cm 1 band varied according to the tube orientation. Lattice vibrations of the halloysite were also found to be orientation-dependent.

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confidence: 90%

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confidence: 97%

Raman Microprobe Spectroscopy of Halloysite

Frost

Shurvell

1997

Clays and clay miner.

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“…For FIR experiments, components are peak wavenumber and FWHM that reflect the potassium vibration in interlayer. The vibration of the potassium corresponds to its parallel movement with regard to the (a, b) crystallographic plane of the di-trigonal oxygen cavity (Ishii et al, 1967). The energy level of potassium vibration, called mode A, is proportional to consecutive illite layer content (Laperche, 1991;Diaz et al, 2002).…”

Section: Institut De Radioprotection Et De Sureté Nucléaire Irsn Atmentioning

confidence: 99%

Physicochemical Reactivity in Clay-Rich Materials: Tools for Safety Assessment

Jullien

Raynal

Kohler

et al. 2005

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Réactivité physicochimique des argiles : outils pour l'évaluation de sûreté -Les matériaux argileux naturels ou industriels sont omniprésents dans les concepts de séquestration des gaz acides, de confinement des polluants et déchets radioactifs, ainsi qu'en couverture de réservoirs géologiques d'hydrocarbures. La fonction de piégeage repose sur des propriétés telles qu'une très faible perméabilité, une capacité élevée d'échange ionique et de sorption, et, dans certains cas, sur un fort pouvoir de gonflement. En raison de la petite taille des pores et de leur tortuosité élevée, mais aussi de par leur surface spécifique très élevée et leur charge électrique importante (particulièrement les smectites), les matériaux argileux développent de telles propriétés de confinement. Dans le cadre des évaluations de performance et de sûreté, la persistance de cette fonction de confinement doit être assurée sur le long terme. Les matériaux argileux et l'ensemble des matériaux d'origine anthropique (béton, acier, verre, etc.) vont interagir physicochimiquement au cours du temps. Les argiles vont également être soumises à des perturbations dues au dégagement de chaleur (notamment dans le cas du stockage des déchets radioactifs) ainsi qu'à des transferts hydriques (eau et vapeur). L'ensemble de ces perturbations couplées est susceptible d'engendrer des transformations irréversibles dont il convient d'estimer l'impact sur le comportement à long terme. Pour aborder la complexité de ces phénomènes, nous combinons des méthodes de caractérisation multiéchelles et multitechniques (infrarouge moyen et lointain, diffraction des RX, microscopie électronique à balayage, microscopie électronique à transmission) sur des échantillons provenant d'expériences de laboratoire et d'analogues naturels. Ensuite, les résultats sont intégrés au travers de la modélisation du transport réactif. La sensibilité élevée des smectites est décrite dans le cas des interactions entre les argiles et le fer métallique, expérimentalement et par l'étude d'analogues naturels. Cette étude montre l'existence d'un seuil de rapport de masse fer/argile au-dessus duquel les smectites tendent à être transformées en de nouveaux minéraux à 7 Å, riches en fer, dont les capacités de gonflement et d'échanges cationiques sont largement inférieures à celles des smectites initiales, et ceci de manière irréversible. À titre d'illustration, la méthodologie est également appliquée pour décrire l'illitisation thermique d'une argilite due à une intrusion basaltique. Malgré le travail de caractérisation et de compréhension, la prévision de l'évolution à long terme de tels systèmes complexes est encore sujette à caution. Modéliser le comportement global des matériaux argileux reste une tâche difficile en raison du fort couplage, présenté par la suite, entre les phénomènes chimiques, mécaniques et de transport, potentiellement contrôlés par une phase de gel smectique, physiquement délicate à prendre en compte.

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“…Because the normal mode analysis of layers of micas made by Ishii et al (1967) shows (Figures 8 and 9 of their paper) that each transition moment corresponding to interlayer and K vibrations has a specific orientation with respect to the a, b, and c axis of the crystal, dichroic experiments around the c and a or b axis were performed. Indeed, the intensity of absorption in a crystal is a function of the angle a between the electric field E of the polarized radiation and the transition moment M, as shown in Eq.…”

Section: Muscovitementioning

confidence: 99%

“…The observed IR absorption bands of micas in the 200-80-cm-t range, were assigned by Ishii et al (1967), using a normal mode analysis, to interlayer and K vibrations. Farmer (1974) assigned bands of micas at about 100 and 150 cm i to the in-plane and out-ofplane vibrations of K, respectively.…”

Section: Introductionmentioning

confidence: 99%

Assignment of the Far-Infrared Absorption Bands of K in Micas

Laperche

1991

Clays and clay miner.

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Abstract--To identify the far-infrared (FIR) absorption bands related to K cations in micas, spectra of muscovite, phlogopite, and biotite were compared with the spectra of pyrophyllite and talc, which have no compensating cations, and to the spectra of micas in which K is substituted by mono-and divalent cations. Dichroic experiments using single crystals of these micas showed that some of the bands or components related to K have a strong in-plane and out-of-plane dichroic character. These experimental data led to the assignment of the FIR bands at 110, 91, and 83 cm -~ for muscovite, phlogopite, and biotite, respectively, which have no in-plane and out-of-plane dichroic character, to the vibration of the double ring of oxygen atoms that constitutes the cage in which K is located (mode III).Bands at 146, t36, and 152 cm -I for muscovite, phlogopite, and biotite, respectively, which have a strong out-of-plane dichroic character, were assigned to the out-of-plane vibrations of K atoms (mode IV). Some of the components at 190, 158-153, and 145-124 cm l for muscovite, phlogopite, and biotite, respectively, which have a strong in-plane dichroic character, are possibly related to the in-plane vibrations of K atoms (modes I and II). The 165-cm ~ band of muscovite is a lattice mode of vibration. Frequencies of modes III and IV of the compensating cations of micas in which K was substituted by mono-and divalent cations exchanged as a function of ~ where Z is the charge and m the mass of the cation. Modes III and IV were well resolved and very sensitive to the crystallochemical properties of the structure (di-or trioctahedral character, Fe content, etc.). FIR spectroscopy may therefore be an important tool that uses compensating cations as probes to study the interactions between the cations and the structure of mica minerals.

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Far infra-red absorption spectra of layer silicates

Cited by 86 publications

References 15 publications

Raman Microprobe Spectroscopy of Halloysite

Raman Microprobe Spectroscopy of Halloysite

Physicochemical Reactivity in Clay-Rich Materials: Tools for Safety Assessment

Assignment of the Far-Infrared Absorption Bands of K in Micas

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