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  • 1
    Electronic Resource
    Electronic Resource
    Surface structures of gibbsite goethite and phosphated goethite (1974)
    [s.l.] : Nature Publishing Group
    Nature 248 (1974), S. 220-221 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Here we establish that the surfaces of the crystalline hydroxides gibbsite (y-Al(OH)3) and goethite (a-FeOOH), both common soil components, are accessible to infrared study, and that their surface structures are well defined and closely related to their bulk structures. The observation of these ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/248220a0
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  • 2
    Electronic Resource
    Electronic Resource
    The relationship between crystal misorientation and conductive mode contrast of grain boundaries in additive-free zinc oxide (1997)
    Springer
    Journal of materials science 32 (1997), S. 4585-4589 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Grain boundaries in additive-free ZnO show different types of conductive mode contrast, depending on the electrical properties. Electron beam scattering patterns have been used to determine the misorientation of grain boundaries showing certain types of conductive mode contrast in order to correlate electrical properties with grain-boundary structure. No correlations were apparent using the coincident-site lattice model, but other criteria suggest that grain-boundary electrical properties may be crystallographically controlled. More detailed analysis will require the full determination of the grain-boundary plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018629503011
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  • 3
    Electronic Resource
    Electronic Resource
    Possible relationship between soil fulvic acid and polymaleic acid (1976)
    [s.l.] : Nature Publishing Group
    Nature 260 (1976), S. 597-597 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Infrared spectroscopy, elemental analysis and a study of the degradation products of these polymers and their derivatives suggested that the polymers had an aliphatic or ali-cyclic backbone substituted predominantly by vicinal carboxyl groups. The soil polymers still contained polysaccharide, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/260597a0
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  • 4
    Electronic Resource
    Electronic Resource
    A new interpretation of the structure of disordered α-cristobalite (1974)
    Springer
    Contributions to mineralogy and petrology 47 (1974), S. 1-6 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Disordered α-cristobalite which occurs extensively in bentonites, opals and particularly deep-sea cherts, has been previously interpreted in terms of a unidimensionally disordered structure in which cristobalite is interstratified with two-layer tridymite-like sheets. An alternative interpretation is that the structure is essentially tridymitic but that the sheets are stacked with random transverse displacement normal to the c axis, an arrangement similar to the translational, turbostratic stacking postulated for smectites. This interpretation was arrived at after a comparitive study of a silica phase in an Italian bentonite and a deep-sea chert, material which yielded an X-ray powder pattern almost identical with that of disordered α-cristobalite, but electron diffraction patterns and infrared spectra more consistent with tridymite. It is suggested that this type of silica, which has been described almost universally as cristobalite, is more appropriately referred to as disordered α-tridymite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00418553
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  • 5
    Electronic Resource
    Electronic Resource
    A Mössbauer effect study of the mineral macaulayite (1988)
    Springer
    Physics and chemistry of minerals 16 (1988), S. 73-77 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The mineral macaulayite, which is thought to consist of layers equivalent to two hematite unit cells flanked by silicate sheets, has been investigated in the temperature range 4.2K–650K by Mössbauer spectroscopy. At low temperatures there is a close resemblance between the spectra of macaulayite and that of hematite in its weakly ferrimagnetic state. At higher temperatures, however, the spectra of macaulayite show two distinct magnetically-ordered components corresponding to surface and bulk iron in the hematite units. Superparamagnetism is observed in the spectra resulting from the microcrystalline nature of the sample. The Néel temperature of macaulayite is measured by extrapolation to be T N=750 ± 20K, substantially below that of hematite (T N=950K), even when the effect of possible aluminium substitution is taken into account. This reduction in the magnetic ordering temperatures is discussed in terms of the proposed layer structure of the mineral.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00201332
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  • 6
    Electronic Resource
    Electronic Resource
    Structural studies of imogolite and allophanes by aluminum-27 and silicon-29 nuclear magnetic resonance spectroscopy (1985)
    Springer
    Physics and chemistry of minerals 12 (1985), S. 342-346 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract High-resolution aluminum-27 and silicon-29 nuclear magnetic resonance spectra of natural and synthetic imogolites and allophanes obtained using high-field“magic-angle” sample-spinning (MASS) techniques indicate that the imogolite and protoimogolite components of allophanes are characterized by sharp (≈3 ppm) silicon-29 resonances at −78±1 ppm from tetramethylsilane (in accord with Barron et al. 1982), and quite narrow (≈10 ppm at 11.7 Tesla) aluminum-27 resonances, at 5.2±1 ppm from Al(H2O) 6 3+ (in accord with Wilson et al. 1984). However, the spectra of natural allophanes usually contain significant intensity arising from a less well defined material, characterized by a broad (≈20 ppm) silicon-29 resonance centered at −90±2 ppm from tetramethylsilane, and a second relatively narrow (≈15 ppm at 11.7 Tesla) aluminum-27 resonance at 58.5±2 ppm from Al(H2O) 6 3+ . Similar characteristic spectral features are exhibited by a synthetic amorphous Si:Al (1:1) gel, and presumably indicate the presence of framework aluminosilicate materials in the gel, and in most allophanes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654344
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  • 7
    Electronic Resource
    Electronic Resource
    Comment on ‘Spectroscopie infra-rouge de quelques acides humiques’ by J. R. Bailly (1974)
    Springer
    Plant and soil 41 (1974), S. 695-696 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In the authors' opinion the I.R. spectra of humic acids may have been erroneously interpretated by Bailly owing to contamination by inorganic salts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185830
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  • 8
    Electronic Resource
    Electronic Resource
    Comment on ‘Contamination of humic acid by silica gel and sodium bicarbonate’ by K. H. Tan (1977)
    Springer
    Plant and soil 47 (1977), S. 263-264 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Although Tan9 has demonstrated that soil humic acid fractions can be prepared free from contaminants, nevertheless, such contaminants have occurred in earlier work and have led to erroneous conclusions based on incorrect interpretation of infrared spectra. re]19760914
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010388
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  • 9
    Electronic Resource
    Electronic Resource
    Comment on ‘Spectroscopie infra-rouge de quelques fractions d'acides humiques obtenues sur Sephadex’ (1977)
    Springer
    Plant and soil 48 (1977), S. 547-548 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary It is suggested that, in IR spectra of fractions of soil organic matter eluted from Sephadex, absorption bands ascribed to aromatic ethers, epoxide rings and alcoholic or phenolic hydroxyl groups by Bailly1 are more consistent with a conventional humic material in its carboxylate from and an associated soil clay mineral such as illite. re]19770204
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02187263
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  • 10
    Electronic Resource
    Electronic Resource
    Direct observation of resistive barriers in a BaTiO3 based thermistor (1997)
    Springer
    Journal of materials science 32 (1997), S. 4641-4643 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The remote electron beam induced current technique has been used to form resistive contrast images of the resistive barriers developed in 80°C thermistor materials. Linescans extracted from the images have been used to calculate the temperature variation of resistivity of selected interfaces within the material. It is seen that the major resistive changes are associated with only a few of the grain boundaries in this material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018698023484
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