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  • 1
    Electronic Resource
    Electronic Resource
    A molecular composite between partially hydrolyzed aluminum cations and a layered calcium niobate perovskite (1991)
    s.l. : American Chemical Society
    Chemistry of materials 3 (1991), S. 977-983 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00017a038
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  • 2
    Electronic Resource
    Electronic Resource
    The structure of star opals (1976)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 32 (1976), S. 334-338 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Optical diffraction patterns have been obtained from a set of unusual gem opals from Idaho, U.S.A. The formation of star patterns in them is described, and the structure producing the stars is deduced from optical diffraction. The arrangement of particles is different from that found previously for Australian opals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739476000727
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  • 3
    Electronic Resource
    Electronic Resource
    Multiple phase formation in the binary system Nb2O5–WO3. VI. Electron microscopic observation and evaluation of non-periodic shear structures (1969)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 25 (1969), S. 1156-1164 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740869003669
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  • 4
    Electronic Resource
    Electronic Resource
    The direct observation of the structure of real crystals by lattice imaging (1973)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 6 (1973), S. 165-190 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The electron-microscope technique of lattice imaging can in favourable circumstances be used to observe the structure of materials directly. The technique is described, and examples of cases in which a direct correlation between image contrast and structural features has been established are given. Procedures for computing contrast in n-beam lattice images are outlined, and the important experimental parameters, thickness and orientation of the specimen, and spherical aberration and defocusing of the microscope objective, are discussed in some detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889873008459
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Ordered arrangements of spheres of two different sizes in opal (1978)
    [s.l.] : Nature Publishing Group
    Nature 275 (1978), S. 201-203 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Packing arrangements of monodispersed spherical particles are of great general interest, and suspended latex spheres may order under the influence of electrostatic interaction from the surface double layers2. Close-packed ordering also achieves a higher density than random packing, and it is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/275201a0
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  • 6
    Electronic Resource
    Electronic Resource
    Structure of Opal (1964)
    [s.l.] : Nature Publishing Group
    Nature 204 (1964), S. 990-991 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. X-ray diffractometer traces. A, a-cristobalite, prepared by heating opal from Coober Pedy, South Australia, at 1,200 C for 30 h; J3, jasp-opal, Guanjuato, Mexico, No. 1664; C, common opal, Sunbury, Victoria, No. 19023; D, common opal, Kalgoorlie, Western Australia, No. 4680; E, common opal, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/204990a0
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  • 7
    Electronic Resource
    Electronic Resource
    Ionization in Fatty Acid Monolayers on Pure Water (1955)
    [s.l.] : Nature Publishing Group
    Nature 175 (1955), S. 644-645 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 shows results from (TT A) measurements over the pH. range 2-9 with stearic acid films on water of increasing degrees of purity. In the graph, c0, the area/molecule at 'zero' compression (that is, at the pressure at which an increase in film pressure is first observed as the film is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/175644a0
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  • 8
    Electronic Resource
    Electronic Resource
    n-Beam lattice images. VI. Degradation of image resolution by a combination of incident-beam divergence and spherical aberration (1975)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 31 (1975), S. 307-310 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Lattice images were computed with increasing incident-beam divergence with spherical aberration taken into account. The effect is as if the outer diffracted beams transmitted by the objective aperture do not contribute to the image, so that the resolution is effectively less than that expected from the aperture size. Images of Nb12O29, calculated with the inclusion of this effect, show improved agreement with experimental images.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739475000654
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  • 9
    Electronic Resource
    Electronic Resource
    Diffraction of light by opals (1968)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 24 (1968), S. 427-434 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Gem opals were examined in an optical diffractometer and found to give several types of diffraction pattern which are interpreted by analogy with conventional three-dimensional X-ray theory to give the structure of the opal. The results show that the spherical silica particles in opals are arranged hexagonally in layers which are usually stacked randomly. In some specimens there are parallel domains of ordered packing, commonly in a f.c.c. sequence and sometimes in a h.c.p. sequence. Although the silica particles cannot be resolved by optical microscopy, bands parallel to the layers and fringes across the bands can be seen in images with the diffracted light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739468000860
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  • 10
    Electronic Resource
    Electronic Resource
    n-Beam lattice images. I. Experimental and computed images from W4Nb26O77 (1972)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 28 (1972), S. 528-536 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A series of through-focus lattice images has been obtained with an electron microscope for single crystals of W4Nb26O77 set at an orientation to give mainly a systematic set of 00l reflexions. Dynamical n-beam computations (n = 435) have been made for a crystal in this orientation to determine the values of the amplitudes and phases of the diffracted beams. Subsequently, the fringe profiles for lattice images have been computed for various thicknesses of crystal and defects of focus. When the experimental factors, including instrument aberrations, are taken into account, good agreement between computed and observed fringes is obtained. An earlier assumption of direct correlation of features in underfocused images with structure in the crystal, is found to be valid, at least for this compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739472001433
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