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  • 1985-1989  (5)
  • 1970-1974  (15)
  • 1
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    Plasticity of single crystals of synthetic quartz (1972)
    American Geophysical Union
    In:  Bull., Polar Proj. OP-O3A4, Flow and Fracture of Rocks, Washington, D. C., American Geophysical Union, vol. 16, no. XVI:, pp. 29-53, (ISBN: 3-540-23712-7)
    Details
    Publication Date: 1972
    Keywords: Rheology ; Physical properties of rocks ; Inelastic ; Laboratory measurements ; Rock mechanics
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
    Electronic Resource
    Electronic Resource
    Quantitative Spectrochemical Analyses of Feldspars by Ion Bombardment (1974)
    [s.l.] : Nature Publishing Group
    Nature 248 (1974), S. 43-45 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 Feldspar Analyses. Number of Ions on the Basis of Thirty-two Oxygens 112 (standard) 190 191 297 Microprobe IBSCA Microprobe Chemical Chemical IBSCA Microprobe IBSCA Microprobe Si 10.086 9.34 9.423 9.341 9.293 11.23 11.132 9.92 9.990 Al 5.916 6.63 6.523 6.628 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/248043a0
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  • 3
    Electronic Resource
    Electronic Resource
    CBED and ALCHEMI investigation of local symmetry and Al, Si ordering in K-feldspars (1987)
    Springer
    Physics and chemistry of minerals 14 (1987), S. 281-292 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract CBED (convergent beam electron diffraction) and ALCHEMI (atom location by channelling enhanced microanalysis) have been used to determine the symmetry and Al-order parameter 2t 1 within homogeneous regions (of the order of 100 nm in diameter) of high sanidine and low microcline. The results are in excellent agreement with those obtained on the same crystals from X-ray measurements of average T-O bond lengths. In view of this agreement, CBED and ALCHEMI were then applied to an orthoclase with a well-developed tweed microstructure. The results indicate that the specimen is partially ordered and that the average symmetry is triclinic. The lattice modulations involve values of γ* in the range 90°〈γ*〈90.5°, with correspondingly small variations of 2t 1 about an average value of 0.67.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307995
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  • 4
    Electronic Resource
    Electronic Resource
    Dislocation nucleation and multiplication in synthetic quartz: Relevance to water weakening (1989)
    Springer
    Physics and chemistry of minerals 16 (1989), S. 465-482 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Recent observations suggest that the water-related defects associated with the so-called water weakening of single crystals of “wet” synthetic quartz are high-pressure clusters of molecular water. The microstructures which evolve in these crystals during both creep and constant strain-rate experiments and by heating alone were observed by TEM and show that the clusters act as highly efficient sources of the glissile dislocations which must be nucleated before plastic flow can be induced. These microstructural observations, together with simple microdynamical concepts based on the Orowan equation, are used to rationalize the creep behaviour and all the main features of the stressstrain curves observed in “wet” synthetic quartz crystals with a wide range of bulk water-contents, without postulating any direct influence of water on dislocation glide. It is proposed, therefore, that the relatively low yield stress of “wet” synthetic quartz is primarily due to the ease with which fresh glissile dislocations are nucleated, rather than to an enhanced glide of hydrolysed dislocations as is generally assumed in most models of water weakening.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197016
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  • 5
    Electronic Resource
    Electronic Resource
    Dislocation structure of the deformation lamellae in synthetic quartz; a study by electron and optical microscopy (1970)
    Springer
    Contributions to mineralogy and petrology 29 (1970), S. 104-115 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Single crystals of experimentally deformed synthetic quartz showing optical deformation lamellae were examined by transmission electron microscopy. Dislocations are distributed fairly uniformly throughout the crystal. However, parallel to the trace of the deformation lamellae, which may be irrational, there are walls of tangled dislocations whose characteristics suggest that they are directly associated with the lamellae. The nature and formation of the optical image is discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392018
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  • 6
    Electronic Resource
    Electronic Resource
    Coarsening kinetics of the exsolution microstructure in alkali feldspar (1974)
    Springer
    Contributions to mineralogy and petrology 48 (1974), S. 45-55 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A maximum microline-low albite of 33 mole percent Or was prepared by alkali ion exchange at 1000° C and subsequently annealed in air at lower temperatures. The exsolution microstructure produced in these samples was studied by transmission electron microscopy. At or above 600° C the compositional difference of the coherent lamellae increases rapidly and reaches a maximum, corresponding to the coherent solvus, within a few days. The lamellar spacing (λ) increases more slowly and the coarsening rate is given by λ=λ0+kt 1/3; where t is annealing time, k is a constant for a given temperature, and λ0 is the lamellar spacing obtained by extrapolation to zero annealing time. λ0 is 65 Å at 600° C and ca. 200 Å at 700° C. The latter is near the maximum temperature at which exsolution is observed. The nonzero value of λ0 and its increase with increasing temperature is evidence that the exsolution occurs by a spinodal mechanism. Data for the coarsening kinetics at other temperatures should be useful for estimating the thermal history of cryptoperthites with coherent lamellae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399109
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  • 7
    Electronic Resource
    Electronic Resource
    Dislocations associated with optical features in naturally-deformed olivine (1971)
    Springer
    Contributions to mineralogy and petrology 30 (1971), S. 53-63 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Transmission electron microscopy has been used for the direct observation of dislocations in naturally-deformed olivine. The dislocations are arranged in arrays forming low-angle sub-boundaries which have been identified with features observed in the optical microscope. Comparison of this dislocation substructure with that observed in olivine, and in metals, experimentally deformed under various conditions, suggests that the deformation in nature has occurred by creep. Possible mechanisms of creep, involving the cooperative glide and climb of dislocations, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00373368
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  • 8
    Electronic Resource
    Electronic Resource
    The domain structure of a transitional anorthite; a study by direct lattice-resolution electron microscopy (1973)
    Springer
    Contributions to mineralogy and petrology 41 (1973), S. 47-52 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Direct resolution of lattice planes corresponding to a-, b- and c-reflections in a transitional anorthite has shown that the material consists of domains of body-centered anorthite (I-An) and primitive anorthite (P-An) in approximately equal proportions. The domains of P-An appear lenticular in shape. Their thickness and orientation readily account for the observed streaking of the c- and d-reflections. Adjacent domains of P-An (separated by a domain of I-An) are observed to be either in register or in antiphase relation, the fault vector being the body-centering vector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377651
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  • 9
    Electronic Resource
    Electronic Resource
    Transmission electron microscope study of the domain structures associated with the b-, c-, d-, e- and f-reflections in plagioclase feldspars (1974)
    Springer
    Contributions to mineralogy and petrology 44 (1974), S. 237-249 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Ten specimens of plagioclase feldspars (An100 to An25) have been examined by transmission electron microscopy using dark field and direct lattice imaging. The specimens are classified into two groups: (i) those that have been quenched from the melt (synthetic An100, An95, An66 and An50) and (ii) those that have been cooled relatively slowly (An94, An77, An75, An52, An32 and An26). The observed contrast is interpreted in detail using the two-beam dynamical theory of electron diffraction contrast. The fault vectors of the antiphase boundaries (APBs) observed in An100 and An77 are determined. Direct resolution of the sublattice and superlattice in specimens of intermediate composition (An75 to An25) indicates that the superlattice is not a regular array of out-of-step faults and is probably due to a simple sinusoidal distortion of the structure. Only three specimens (An100, An77 and An50) exhibited a single structural type. All the remaining specimens consisted of intergrowths of two structural types. The structural type present in any particular specimen depends upon its An-content and thermal history. The rate of transformation from any structural type to a lower-temperature structural type appears to decrease with decreasing An-content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00413169
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  • 10
    Electronic Resource
    Electronic Resource
    Operating characteristics of an ion-bombardment apparatus for thinning non-metals for transmission electron microscopy (1971)
    Springer
    Journal of materials science 6 (1971), S. 87-89 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550298
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