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  • 1970-1974  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    n-Beam lattice images. IV. Computed two-dimensional images (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 389-401 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The contrast in electron-microscope lattice images of crystals oriented with a zone axis parallel to the incident electron beam has been computed for several complex oxides with large unit cells. The effects of changes in crystal thickness, image defocus, objective aperture size (up to 100 contributing diffracted beams) and spherical aberration are considered, and it is shown that, under certain conditions, the appearance of the image resembles that of the crystal structure. The bounds of applicability of the simple charge-density approximation are investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473000999
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    n-Beam lattice images. III. Upper limits of ionicity in W4Nb26O77 (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 138-147 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The scattering factor for electrons is sensitive to differences in atomic bonding at low values of sin θ/λ. These differences will influence the amplitudes and phases of low-order beams of electrons diffracted from crystals with large unit cells. The experimental intensities of these beams, and contrast in the corresponding lattice images, can be used to derive upper limits for the charges on constituent ions, provided the associated n-beam dynamical calculations are carried out with sufficient precision. It is shown that, in W4Nb26O77, the atoms can be only partially ionized, and the bonding must have some covalent character.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473000379
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    n-Beam lattice images. II. Methods of calculation (1972)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 28 (1972), S. 536-548 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The calculation of amplitudes and phases of beams of electrons diffracted from thin (≤ 100 nm) crystals of W4Nb26O77 is described. These diffraction data are used to compute 11-beam 00l electron microscope lattice images and the effects of instrument aberrations are considered. Several approximations are compared with a more exact 435-beam, two-dimensional computation, and with experimental diffraction data and lattice images. Finally, the projected charge density approximation to image contrast is evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739472001445
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    n-Beam lattice images. III. Upper limits of ionicity in W4Nb26O77 (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 302-302 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Corrections are given to Anstis, Lynch, Moodie & O'Keefe [Acta Cryst. (1973). A29, 138-147].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739474000684
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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