Far-infrared spectra of ammonium layer and framework silicates

Mookherjee, Mainak; Redfern, Simon A. T.; Zhang, Ming

doi:10.1127/0028-3649/2004/2004-0001

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…FIR spectra of muscovite and various clay minerals have been reported by Ishii et al (1967), Loh (1973), Farmer (1974), Tateyama et al (1977), Velde (1978), Roth (1978), Fripiat (1982), Velde and Couty (1985), Prost and Laperche (1990), Schroeder (1990), Laperche and Prost (1991), Diaz et al (2000), Boukili et al (2001), Mookherjee and Redfern (2002), Friedrich et al (2006), and Zhang et al (2010). The mid-IR spectra of ammonium in both synthetic and natural (NH 4 /ND 4 )-containing muscovite was described by Vedder (1965), Bokij and Arkhipenko (1977), Shigorova et al (1981), Higashi (1982), Shigorova (1982), Voncken et al (1987), Bastoul et al (1993), Harlov et al (2001), and Zhang et al (2010), and FIR spectra of micas have been reported by Mookherjee et al (2004). Beran (2002) and Fleet (2003) reviewed FTIR work on micas, including the MIR and FIR regions.…”

Section: Introductionmentioning

confidence: 87%

Far-infrared spectra of synthetic dioctahedral muscovite and muscovite-tobelite series micas: Characterization and assignment of the interlayer I-Oinner and I-Oouter stretching bands

Ishida

Hawthorne

2013

American Mineralogist

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Far-infrared spectroscopy and X-ray powder diffraction Rietveld structure refinement for the hydrothermal synthetic muscovite series, (a) KAl 3 (Si 3-y Ge y )O 10 (OH,OD) 2 , (b) KGa 3 (Si 3-y Ge y )O 10 (OH,OD) 2 , and (c) K(Al 3-x Ga x )Ge 3 O 10 (OH,OD) 2 , where x = 0.0-3.0, y = 0.0-3.0, and the muscovite-tobelite series, (d) [K 1-A (NH 4 ,ND 4 ) A ]Al 3 Si 3 O 10 (OH,OD) 2 , where A = 0.0-1.0, indicate that there is a complete solid-solution in each series. In the 200-50 cm -1 far-infrared region, four kinds of bands are observed: two bands due to octahedral deformation coupled with OH deformational vibrations between 240 and 130 cm -1 , an in-plane tetrahedral torsional band between 175 and 130 cm -1 , an interlayer I-O inner stretching band, and an I-O outer stretching band. The weak and broad 140 cm -1 band is assigned to K-O inner stretching and the strong broad 110 cm -1 band to K-O outer stretching in muscovite. The broad 175 cm -1 band is (NH 4 /ND 4 )-O inner stretching and the 140 cm -1 broad strong band is (NH 4 /ND 4 )-O outer stretching in tobelite. With increasing Ga→Al substitution, the I-O inner and I-O outer stretching bands shift to lower frequency, while with increasing Ge→Si substitution, the I-O inner stretching band shifts to higher frequency; the I-O outer stretching bands do not change as a function of composition.

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Section: Introductionmentioning

confidence: 87%

Far-infrared spectra of synthetic dioctahedral muscovite and muscovite-tobelite series micas: Characterization and assignment of the interlayer I-Oinner and I-Oouter stretching bands

Ishida

Hawthorne

2013

American Mineralogist

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“…From the infrared measurements, especially far-infrared (H 4 N-O stretching and lattice mode, Mookherjee et al 2004) and the internal modes of the ammonium ion, it appeared that it is the ammonium ion which undergoes slight changes at low temperatures. However, it is also likely that the ammonium ion cage undergoes a change at around 210 K influencing the orientation of the ammonium ion, i.e.…”

Section: C2 Refinement Schemementioning

confidence: 99%

Low-temperature behaviour of ammonium ion in buddingtonite [N(D/H)4AlSi3O8] from neutron powder diffraction

Mookherjee

Redfern

Swainson³

et al. 2004

Phys Chem Minerals

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The structural response of buddingtonite [N(D/H) 4 AlSi 3 O 8 ] on cooling has been studied by neutron diffraction. Data have been collected from 280 K down to 11 K, and the crystal structure refined using the Rietveld method. Rigid-body constraints were applied to the ammonium ion to explore the structural properties of ammonium in the M-site cavities at low-temperature. Low-temperature saturation is observed for almost all the lattice parameters. From the present in situ low-temperature neutron diffraction studies, there is no strong evidence of orientational order-disorder of the ammonium ions in buddingtonite.

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ATR and transmission analysis of pigments by means of far infrared spectroscopy

et al. 2009

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In the field of FTIR spectroscopy, the far infrared (FIR) spectral region has been so far less investigated than the mid-infrared (MIR), even though it presents great advantages in the characterization of those inorganic compounds, which are inactive in the MIR, such as some art pigments, corrosion products, etc. Furthermore, FIR spectroscopy is complementary to Raman spectroscopy if the fluorescence effects caused by the latter analytical technique are considered. In this paper, ATR in the FIR region is proposed as an alternative method to transmission for the analyses of pigments. This methodology was selected in order to reduce the sample amount needed for analysis, which is a must when examining cultural heritage materials. A selection of pigments have been analyzed in both ATR and transmission mode, and the resulting spectra were compared with each other. To better perform this comparison, an evaluation of the possible effect induced by the thermal treatment needed for the preparation of the polyethylene pellets on the transmission spectra of the samples has been carried out. Therefore, pigments have been analyzed in ATR mode before and after heating them at the same temperature employed for the polyethylene pellet preparation. The results showed that while the heating treatment causes only small changes in the intensity of some bands, the ATR spectra were characterized by differences in both intensity and band shifts towards lower frequencies if compared with those recorded in transmission mode. All pigments' transmission and ATR spectra are presented and discussed, and the ATR method was validated on a real case study.

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Far-infrared spectra of ammonium layer and framework silicates

Cited by 3 publications

References 18 publications

Far-infrared spectra of synthetic dioctahedral muscovite and muscovite-tobelite series micas: Characterization and assignment of the interlayer I-Oinner and I-Oouter stretching bands

Far-infrared spectra of synthetic dioctahedral muscovite and muscovite-tobelite series micas: Characterization and assignment of the interlayer I-Oinner and I-Oouter stretching bands

Low-temperature behaviour of ammonium ion in buddingtonite [N(D/H)4AlSi3O8] from neutron powder diffraction

ATR and transmission analysis of pigments by means of far infrared spectroscopy

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