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  • 1970-1974  (3)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    X-ray determination of polarity sense by anomalous scattering at an absorption edge (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 27-32 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A technique is described for the determination of crystallographic polarity which is generally applicable to large polar crystals containing an element heavier than K. It is an extension and simplification of Cole & Stemple's method in which the intensities diffracted by (00 l) and (00\overline l) planes are compared at wavelengths close to an absorption edge of a constituent element. A definitive polarity determination may now be made without previously measuring or assuming values of Δf′ and Δf′′ at the edge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870005599
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Lithium tantalate single crystal stoichiometry (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 395-399 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Accurate lattice parameter, hydrostatic density and Curie temperature measurements have been made on lithium tantalate single crystals grown from different melt compositions. Crystal compositions were determined by comparing crystal Curie temperatures with those determined from well reacted ceramic specimens of known composition. These measurements showed that a stoichiometric melt produces nonstoichiometric crystals and that the congruently melting composition is 49.0 mole % Li2O. The resulting defect model for nonstoichiometric lithium tantalate is Li[1−(5−n)x]Ta(1+x)nxe−O3 where n∼2 and the existence region is 46.0 to 50.4 mole % Li2O at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870006490
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A method of preparation of powder samples for Debye–Scherrer–Hull X-ray diffraction (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 381-382 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889872009860
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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