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  • 1970-1974  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Polymorphisme des solutions solides du sodium dans l'aluminate tricalcique (1973)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 6 (1973), S. 355-364 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Three crystalline forms (cubic, orthorhombic I and orthorhombic II) exist in the Na2O–Ca3Al2O6 solid-solution series at room temperature. A tetragonal form may be obtained by quenching. All the phases have lattices extremely close to the cubic form. The cubic and tetragonal varieties show no polymorphic transformations. The orthorhombic OI and OII phases become tetragonal at high temperature. There is complete agreement between the transition points revealed by X-ray diffraction and microscopy. However, only the order–disorder OII→T transition is observed by μDTA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889873008885
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Etude des phases haute température de NaNb3 et des correlations qui les caracterisent (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 423-430 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: From the study of X-ray diffuse scattering diagrams, it has been shown that the diffuse scattering located along three equivalent reciprocal rods (100) in the cubic phase disappears successively at 641, 575 and 520°C. The interpretation is given in terms of planar local order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739474000921
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Désordre linéaire dans les cristaux (cas du silicium, du quartz, et des pérovskites ferroélectriques) (1970)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 26 (1970), S. 244-254 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Many crystals produce a diffuse scattering of X-rays which is localized in a series of relplanes. It is shown that the corresponding linear disorder in the crystal may have various origins. In silicon, the scattering is due to thermal vibrations and is well explained by the elastic properties of the crystal. In neutron irradiated quartz the radiation damage is responsible for the major part of the scattering. The case of BaTiO3 and KNbO3 is discussed in detail. A linear disorder is proposed which accounts better for the different distributions of the scattering in the 4 allotropic phases than the alternative explanation of the soft mode. In spite of some neutron inelastic scattering results it is not yet possible to distinguish between static and dynamic disorder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947000061X
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    Paper (German National Licenses)
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