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  • American Physical Society (APS)  (18,515)
  • International Union of Crystallography (IUCr)
  • 2010-2014  (18,515)
  • 1970-1974  (775)
  • 2013  (18,515)
  • 1971  (775)
Collection
Keywords
Publisher
Years
  • 2010-2014  (18,515)
  • 1970-1974  (775)
Year
  • 1
    Electronic Resource
    Electronic Resource
    A comparison between the variances of the Cu Kα and Fe Kα spectral distributions (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 43-50 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The variance of the X-ray spectral distribution in the Cu Kα multiplet has been redetermined with improved accuracy and over a wider range than previously. This investigation is parallel to that of Edwards & Toman on iron radiation, with which comparison is made on the following points: (i) the effect of using a β-filter and (ii) the effect of interpolating the line profile under the Kα satellite group. Both definitions of the variance are considered and three linear regions can generally be distinguished in the variance–range function. The choice of definition and the usefulness of the different linear regions in any practical application are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889871006216
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  • 2
    Electronic Resource
    Electronic Resource
    The thermal expansion of titanium, vanadium and niobium monoxides (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 103-109 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: At the stoichiometric 1 : 1 ratio of atoms, the cubic NaCl-type monoxides TiO, VO and NbO have a large number of vacant sites on both the metal and oxygen sublattices. X-ray determinations of the thermal expansions of these materials show quite distinct differences. At 298 °K, the coefficients of linear expansion defined as α = (1/a)(da/dT) are as follows: (TiO)0.856(\square)0.144, α = 6.6 (7) x 10−6; (VO)0.848(\square)0.152, α = 9.3 (6) x 10−6; (NbO)0.750(\square)0.250, α = 4.8 (0) x 10−6. Progressive filling of the vacancies in titanium monoxide merely shifts the expansion curves parallel to each other in the direction of higher lattice parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889871006447
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  • 3
    Electronic Resource
    Electronic Resource
    The double-crystal X-ray spectrometer: corrections, errors, and alignment procedure (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 130-138 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The theory of the X-ray double-crystal spectrometer is outlined. For a vertical rotation axis, crystal planes should be vertical and the X-ray beam horizontal. Geometrical errors are introduced by crystal tilts (departure from vertical) and misalignment (departure of central ray from horizontal). Even with perfect alignment a vertical divergence correction is required. A typographical error in Schwarzschild's analysis of these geometrical effects led to erroneous results by Schnopper, later corrected in an erratum. The physical significance of this revision is considered here. The resulting expression for relative wavelength error indicates that, for zero tilt, misalignment produces no significant errors in relative wavelengths. Geometrical errors are shown to be negligible in recent measurements of Bearden and very small in earlier work of Bearden & Shaw. The Williams vertical divergence correction, used by Bearden, is proven valid; the Parratt form, preferred by Schnopper, is incorrect. An alignment procedure which can reduce geometrical errors below 1 part per million is described. It employs a precision engineer's level (with autocollimating telescope) and a simple technique for grinding crystal faces parallel to atomic planes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889871006484
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  • 4
    Electronic Resource
    Electronic Resource
    Application of Ru-filtered monochomatic Ag Kα2 to X-ray topographic study (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 146-151 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Several applications of X-ray topography with Ru-filtered Ag Kα2 radiation are described. Two of these are variations of the Lang method combined with a Ru filter. The first one is to improve the Lang traverse pattern from a specimen crystal including locally highly distorted regions such as inclusions, as demonstrated for a pure iron crystal. The second is to obtain a traverse pattern from the whole area on the same topograph for a specimen including appreciably misoriented parts, by making the first slit wider than usual. This example has been shown for a Ge crystal. Another application is concerned with taking a topograph of an area as wide as of the order of the length of a line focus, in a shorter exposure time, with high resolution. Examples have been shown for Ge and Si crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889871006502
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  • 5
    Electronic Resource
    Electronic Resource
    An X-ray safety window for the Philips PW1081 radiation protection device (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 87-87 
    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/S0021889871099928
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  • 6
    Electronic Resource
    Electronic Resource
    Notes and News (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 89-90 
    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/S0021889871006344
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  • 7
    Electronic Resource
    Electronic Resource
    Crystallographers (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 90-90 
    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/S0021889871006356
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  • 8
    Electronic Resource
    Electronic Resource
    X-ray study of primary long chain alkylammonium halides (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 93-95 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Primary normal alkylammonium halides crystallize in a preferred crystallographic orientation, forming single or twinned layers. The basal spacings are related to the number of carbon atoms within the homologous series, and are doubled in the twin layers. The orientation of the hydrocarbon chains between the ionic heads is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889871006423
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  • 9
    Electronic Resource
    Electronic Resource
    Charts for analysing crystallite orientation distribution function plots for hexagonal materials (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 193-196 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Charts are given which provide a rapid and unambiguous way of attributing ideal orientations to regions of crystallite orientation distribution function plots for hexagonal materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188987100668X
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  • 10
    Electronic Resource
    Electronic Resource
    Precision determination of lattice parameters at low temperatures without the use of liquid gases (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 201-204 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The design of a vacuum jacketed multiple-exposure back-reflection camera and the adaptation of this camera to a closed circuit pressurized helium cryostat has made it possible to determine lattice parameters by X-ray diffraction to temperatures as low as 25 °K without liquid gases. The advantages of this new design are: short exposure periods (5 to 30 minutes), multiple (usually 6) exposures on a single film at any temperature between 25 and 180 °K, elimination of film shrinkage and hence, high precision lattice constants and thermal expansion coefficient determinations; easy detection of phase transformations. The lowest temperatures can be reached in 30 minutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889871006708
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