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  • 1975-1979  (8)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    A goniometer for electron microscopy at 1.6 Å point-to-point resolution (1979)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 12 (1979), S. 279-286 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The design, operating principles and constructional details of a goniometer for use in ultra-high-resolution objective-lens pole-pieces are described. Image-matching of experimental and computer-simulated high-resolution electron micrographs is used to demonstrate an instrumental resolution of 1.6 Å, point-to-point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889879012474
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the multiple orientation relationships between hematite and magnetite (1979)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 12 (1979), S. 287-294 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Lattice fringe and diffraction observations of hematite/ magnetite interfaces are described: elongated laths of magnetite, with (111)M and ({\bar 1}11)M parallel to (0001)H and, less frequently, (211)M and ({\bar 2}11)M parallel to (0001)H, were found. In general, the interfaces are incoherent as shown by the presence of steps, which are probably transformation dislocations. The magnetite is invariably multiply twinned, showing steps which may be twinning dislocations. A theoretical analysis of the possible secondary and ternary orientation relationships due to multiple twinning explains one of the two further less-frequent relationships indicated by texture goniometry. Such higher-order relations are not topotaxic and their identification and interpretation is a general problem for texture goniometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889879012486
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Intersecting defect structures in gallia-and magnesia-doped rutiles (1979)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 449-458 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The possible { 210 } (0½0) defect intersection structures of rutile are analysed. There are 41 distinct intersection classes, 26 of which may exist as enantiomorphic forms. A classification scheme is introduced and used to analyse 386 observed intersections. Examples of 25 classes occur; eight of these account for 87% of the observations. The occurrence frequency may be understood by analysis of the stair-rod dislocation Burger's vector, required for continuity of the rutile structure around the intersection. Structural models for the commonly observed intersections and the nature of the 'dislocation-core' structures are presented. Exceptionally large tunnels are generated at orthogonal intersections and some high-resolution images are discussed. Statistical analysis shows that the distribution over the possible classes is not random, suggesting that an equilibrium network of intersecting defects may arise after long reaction times. The stability and mobility of intersections is expected to determine the kinetics of the reaction between rutile and dopants. Intersection structures may act as nuclei for low- to high-temperature phase transformations and they may aggregate and order to form new ordered structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739479001066
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    High-temperature intergrowth structures in the Fe2O3–TiO2 system – metal atom ordering in the intergrowth boundaries (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 2412-2424 
    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/S0567740878008353
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Structural relationships between β-gallia, rutile, hollandite, psilomelane, ramsdellite and gallium titanate type structures (1979)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 530-538 
    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/S0567740879004088
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The structure of Ga4Ti21O48 (1976)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 32 (1976), S. 1756-1761 
    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/S0567740876006341
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Investigation of thin MoO3 crystals by convergent-beam electron diffraction (1978)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 296-308 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The MoO3 structure is analysed by means of multi-slice calculations for crystals up to 80 Å thick. It is shown that for such thin crystals convergent-beam patterns can be simply analysed. This allows crystal thickness to be readily determined and opens up the way to more precise structure factor measurements. Many-beam calculations are also used to analyse unit-cell and symmetry data obtained by convergent-beam diffraction/microscopy observations of '101' domains in molybdenum trioxide, showing that [MoO6] octahedra in domains are more nearly regular than in MoO3. This is supported by analysis of thermal diffuse scattering. The '101' domain structure has space group Cmcm and unit-cell parameters identical to those of the molybdenum oxide-hydroxide Mo4O10(OH)2. A qualitative comparison of calculated and observed intensities for the space-group-forbidden 100 reflexions of MoO3 indicates the presence of epitaxically deposited surface layers. This observation, together with the evidence of a hydroxylated domain structure, suggests that thin crystals are formed with epitaxic hydroxyl layers which diffuse into the bulk structure when the crystals are heated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739478000558
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Electron-optical imaging of the hollandite structure at 3 Å resolution (1977)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 672-676 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: This paper shows that it is possible markedly to improve the resolution obtainable in electron micrographs by deliberately using low beam divergence (2 × 10-4 rad) and by minimizing thermal spread in the electron gun. Point-to-point resolutions in the sub-3 Å range will be illustrated for the hollandite structure. Image matching, including the effects of both beam divergence and chromatic aberration, showed that the experimental images could be fitted using 2 Å objective aperture, with no divergence and defocus ripple of only 50 Å. In fact, these stringent experimental requirements must be met if useful structural information is to be obtained in the 2-3 Å range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739477001661
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    Paper (German National Licenses)
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