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  • 1980-1984  (4)
  • 1981  (4)
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  • 1980-1984  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Irradiation-induced defects in β'ppp-alumina examined by high-resolution electron microscopy (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 38-42 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Electron-induced defects in β′′′′-alumina, Na2O.3MgO.7Al2O3, are examined by high resolution electron microscopy. The phenomena can be reasonably explained in the same manner as previously done for a similar case in β′′′′-alumina [Matsui & Horiuchi (1981). Acta Cryst. A37, 51–61]; two spinel-like blocks (each having six oxygen layers) on both sides of the lost conduction plane are directly combined to form cubic close packing of twelve oxygen layers through the minimum shift vectors. The arrangements of cations in a resultant defect block are slightly different from those in the spinel lamella of the same thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889881008637
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Irradiation-induced defects in β''-alumina examined by 1 MV high-resolution electron microscopy (1981)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 51-61 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The defect blocks formed in β''-alumina by electron irradiation are examined by 1 MV high-resolution electron microscopy. In order to explain the fact that two distinctly different types of defect images appear even in a single 1 MV micrograph, a new structural model is constructed in place of the two models so far reported. In the model proposed, two spinel-like blocks on either side of the eliminated conduction plane are directly combined by the vectors including x, y components to form cubic close packing of oxygen layers in the resultant defect blocks. The arrangements of cations in the defect block are slightly different from those expected from the spinel structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739481000107
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal structure analysis of Ca4YFe5O13 by combining 1 MeV high-resolution electron microscopy with convergent-beam electron diffraction (1981)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 723-728 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: By combining 1 MeV high-voltage-high-resolution electron microscopy with convergent-beam electron diffraction (CBED), the crystal structure of a perovskite-related compound, Ca4YFe5O13, is determined. The crystal has orthorhombic symmetry with lattice parameters a = 5.46, b = 37.4 and c = 5.54 Å. The space group is determined to be centrosymmetric Pnma by selecting the point group from the CBED patterns. The structure images taken from two principle-axis directions, which are interpreted on the basis of the calculated images, reveal that the structure consists of a succession of the stacking of FeO6 octahedra (O layer) and FeO4 tetrahedra (T layer) and is represented by the stacking sequence of ...OTOOTOTOOTO... along the b axis repeated at intervals of 37.4 Å. It is shown that the Ca4YFe5O13 crystal structure can be described in terms of unit-cell-level twinning of Ca2Fe2O5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739481001605
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Formations of rhombohedral boron nitride, as revealed by TEM-electron energy loss spectroscopy (1981)
    Springer
    Journal of materials science 16 (1981), S. 1114-1116 
    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/BF00542761
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    Paper (German National Licenses)
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