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  • 1
    Electronic Resource
    Electronic Resource
    Comportement du Nickel Lors de L'Altération des Roches Nickélifères (1984)
    Springer
    Mineralium deposita 19 (1984), S. 118-122 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract Infrared and visible absorption spectra of inorganic silico-magnesian gels were measured in order to study the nickel evolution during the meteoric alteration of rocks. The samples are obtained by mixing solution of nickel, magnesium sulfate with a sodium silicate solution in variable proportions. Measurement of spectra was carried out on sample after they were air dried. These spectra show bands which point that nickel atoms are inserted in a site configuration similar with the lizardite configuration. This results suggest that silico-magnesian gels observed in the neocaledonians minerals could be considered as proto-serpentines. Garnieritics minerals are obtained by cristallization of those proto-serpentines. Two pictures of migration of nickel are proposed, one for the nickeliferous peridotite, other for the serpentine.
    Notes: Resumé Afin de déterminer le comportement du nickel lors de l'altération météorique des roches nickélifères, une étude en spectroscopie d'absorption infrarouge et visible a été réalisée sur des gels silico-magnésiens synthétiques enrichis en nickel. Les échantillons sont obtenus par coprécipitation en mettant en présence une solution de sulfate de nickel et de magnésium et une solution de silicate de sodium. Les spectres, enregistrés à partir d'échantillons séchés à l'air, présentent des bandes d'absorption qui indiquent que le nickel est dans une configuration cristallochimique semblable à celle qu'il possède dans les lizardites. Ces résultats confirment l'hypothèse selon laquelle les fractions silicatées riches en nickel des minerais de type néocalédoniens sont issues, par cristallisation, de gels silicomagnésiens, considérés comme des proto-serpentines. Ils permettent d'envisager deux schémas de cheminement du nickel selon que l'on part d'une péridotite nickélifère ou d'une serpentine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204670
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  • 2
    Electronic Resource
    Electronic Resource
    Small diamond anvil high-pressure cell for infrared spectroscopy of gas and liquid (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 412-414 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A small diamond anvil cell (DAC) for pressure (6 GPa) and temperature (90–500 K) infrared spectroscopy is described. The purpose of this equipment is to investigate phase diagrams of fluids. Infrared spectra of freon (CHF2Cl+C2ClF3) in the liquid and solid phases are given here to illustrate the capability of this apparatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139297
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  • 3
    Electronic Resource
    Electronic Resource
    A one kilobar pressure heating stage: Application to the study of fluid inclusions in fluorite under confining pressure
    Amsterdam : Elsevier
    Physica B+C 139-140 (1986), S. 841-844 
    Details
    ISSN: 0378-4363
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-4363(86)90714-X
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of line intensities of ^2^7Al in A1"2O"3 by Solid-State NMR
    Amsterdam : Elsevier
    Journal of Magnetic Resonance (1969) 86 (1990), S. 613-617 
    Details
    ISSN: 0022-2364
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-2364(90)90038-B
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  • 5
    Electronic Resource
    Electronic Resource
    Raman spectra of gypsum under pressure (1983)
    Springer
    Physics and chemistry of minerals 10 (1983), S. 89-93 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Raman sprectra of a gypsum crystal were made at pressures between 0.001 and 7 kbar using He gas as the pressure medium. $$\frac{{{\text{d}}v}}{{dP}}$$ values for bands in the range 3,600–100 cm−1 were obtained. Comparison of results with $$\frac{{{\text{d}}v}}{{{\text{d}}T}}$$ from the literature for temperatures of 77 and 300° K. shows that the internal modes of the SO4 units are more sensitive to pressure than to temperature. The effect is small. Coupled H2O-SO4 translational modes are greatly affected by both pressure and temperature while coupled Ca-SO4 mode are less so. It was found that stretching vibrations of water molecules were affected differently under pressure. The band at 3,500 cm−1 is more greatly displaced by pressure $$\left( {\frac{{{\text{d}}v}}{{{\text{d}}P}} = {\text{2}}{\text{.11cm}}^{{\text{ - 1}}} /{\text{kbar}}} \right)$$ than the band at 3,400 cm−1 $$\left( {\frac{{{\text{d}}v}}{{{\text{d}}P}} \simeq {\text{2}}{\text{.11cm}}^{{\text{ - 1}}} /{\text{kbar}}} \right)$$ . Assuming two different hydrogen bond intensities for the water molecules, one can attribute this difference in behavior of stretching modes to and increase in hydrogen bonding of one of the hydrogens which is exterior to the double H2O planes in the gypsum structure. The great variety of pressure derivatives for the different types of vibrational modes observed indicates that each molecular unit readjusts internally to pressure induced volume changes and the some of the chemical bonds between the units are significantly affected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309590
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  • 6
    Electronic Resource
    Electronic Resource
    High pressure infrared spectra of diaplectic anorthite glass (1987)
    Springer
    Physics and chemistry of minerals 14 (1987), S. 345-349 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Samples of synthetic diaplectic anorthite glass (38 GPa shock pressure), thermal glass and synthetic anorthite crystals were investigated using infrared spectral methods at one atmosphere and high pressures (near 4 GPa). Band positions and pressure derivatives for the Si-O asymmetric modes in the region 1,300–900 cm−1 indicate that the diaplectic glass has more structural similarities with the crystalline material than with thermal glass even though the overall infrared spectral characteristics suggest a glassy state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309808
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  • 7
    Electronic Resource
    Electronic Resource
    Far infrared spectra of hydrous layer silicates (1985)
    Springer
    Physics and chemistry of minerals 12 (1985), S. 347-352 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Observation of major bands seen in infrared spectra of 26 phyllosilicates (23 of which were produced in the laboratory) are reported for wave numbers from 50 to 280 cm−1. Substitutions in the various structural sites (interlayer, tetrahedral and octahedral) permit one to identify the ions which contribute to the vibrations which give rise to bands in the infrared spectra. No attempt is made to assign vibrational modes or specific vibrational types. Using the following ion substitutions, OH-OD; Na-K-Sr-Mg-Ca; Si-Ge; Al-Ga; Mg-Co-Ni-Fe, it is apparent that in the 7 Å chlorite (amesite and chrysotile), kaolinite, pyrophyllite, aluminous dioctahedral mica, aluminous smectites and trioctahedral micas it is not possible to attribute any low frequency bands as being dominated by interlayer ion stretch vibrations (alkali ions). The cations which participate in the vibrators responsible for the dominant modes observed then seem to be Si and Al. This does not exclude the existence of interlayer ion stretch modes in these spectral regions, however they could not be identified. In the materials studied only a few bands can be attributed to hydroxyl-related vibrations and little influence is seen for octahedrally coordinated ions in dioctahedral minerals. It is important to note that the lowest frequency bands (80–140 cm−1) are apparently dominated by vibrations in the network and especially to the Si-O part of the structure. Low frequency bands are however most apparent in charged layer structures, i.e. micas and smectites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654345
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