Electronic Resource
[S.l.]
:
International Union of Crystallography (IUCr)
Acta crystallographica
48 (1992), S. 872-879
ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
A model of crystal defects is developed to describe the diffraction of X-rays from imperfect crystals containing defect surfaces and crystal grains. The model, which is based on continuum theory for an isotropic homogeneous elastic medium, leads to a stochastic first-order differential equation, known as a Langevin equation. The solution of this equation is used to derive a correlation function for the strain-dependent term in the formula for the crystal reflectance. A consequence of the model is that the kinematic reflectivity of an imperfect crystal is given by the convolution between the perfect-crystal reflectivity and a function that transforms between a Gaussian and a Lorentzian depending on a correlation length in the crystal.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108767392004719
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