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  • International Union of Crystallography (IUCr)  (2)
  • Annual Reviews
  • 1985-1989  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Systematic errors in precision lattice-parameter determination of single crystals caused by asymmetric line profiles (1986)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 19 (1986), S. 34-38 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The convolution of the various contributions to X-ray intensity distribution curves measured in lattice-parameter determination leads to peak shifts and, hence, to systematic errors in the case that at least one of the contributing curves is asymmetric. For perfect crystals, depending on the collimator divergence, this effect may reach the order of magnitude of the refraction correction. It is caused by the asymmetry of the spectral distribution curve, which includes intrinsic asymmetry, dispersion and angle dependence of intensity (ADI). For imperfect crystals characterized by orientation and interplanar-spacing distributions, the distribution curves should be measured in order to correct accurately the peak shift. Examples of simulation calculations are given for Si, Cu Kα1, Bond method for various reflections of perfect crystals and for crystals having orientation distributions, 444 reflection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889886090039
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  • 2
    Electronic Resource
    Electronic Resource
    A method for precision lattice-parameter measurement of single crystals. Erratum (1985)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 365-365 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: In the paper by Berger [J. Appl. Cryst. (1984), 17, 451–455] two errors have occurred. The formulae for the vertical divergence error Δθd on page 453, left-hand column, should read: \Delta \theta _{d} = {{1}\over{2}} {\rm tan} \theta {{ \int\limits^F_{-F} \int\limits^P_{-P} \delta ^{2}{\rm d}p {\rm d}f}\over{\int\limits^F _{-F} \int\limits^P_{-P} {\rm d}p {\rm d}f}}with \delta = (p - f)/s,and thus \Delta \theta _{d} = {{1}\over{6}} {\rm tan} \theta(P^{2} + F^{2})/s^{2}. \eqno (3)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889885010470
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    Paper (German National Licenses)
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