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  • 1
    Electronic Resource
    Electronic Resource
    LaAl2.03(B4O10)O0.54 (1998)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 11-12 
    Details
    ISSN: 1600-5759
    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/S010827019701072X
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  • 2
    Electronic Resource
    Electronic Resource
    Synchrotron radiation topographic observation of KTiOPO4 crystals under an electric field (1999)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 32 (1999), S. 187-192 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: In situ white-beam synchrotron radiation topographic observations under an electric field have been made on the KTiOPO4 (KTP) family of crystals. The investigation shows a strong enhancement of diffracted intensity for hkl reflections (l ≠ 0) and topographic contrast in the form of fine striations when the external electric field is parallel to the polar axis. Several kinds of doped and undoped samples with various grown-in defects, such as domain boundaries, growth striations, growth-sector boundaries, dislocations, etc., have been studied in detail. The results suggest that these defects have very little effect on the field-induced striations. It is believed that the movement of K^+ ions driven by the electric field leads to a local accumulation of charges and a lattice distortion. The strongly anisotropic conductivity is a governing factor in the explanation of the field-related phenomena in this kind of quasi-one-dimensional conductor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889898011248
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  • 3
    Electronic Resource
    Electronic Resource
    Contrast of Ferroelastic and Ferroelectric Domains in White-Beam X-ray Topographs (1996)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 29 (1996), S. 371-377 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: White-beam synchrotron topography has been demonstrated to be well suited for observation of all kinds of ferroelastic and ferroelectric twin domains. It is found that the domains that are misorientated against each other always appear as orientation contrasts in the topographs, while the antiparallel domains with parallel lattices may show different diffraction intensity by the synchrotron-radiation anomalous-scattering effect. Based on the reciprocal-lattice splitting and the diffraction geometry, a general method of determination of the image displacement associated with two misorientated domains is given to explain their orientation contrast. It is also revealed that the anomalous-scattering contrast of antiparallel domains arises from the anomalous-dispersion terms of the noncentrosymmetric atoms in the unit cell of ferroelectric crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188989600221X
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