ISSN:
1600-5767
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Geosciences
,
Physics
Notes:
A previously described method of synthesizing a real-space distribution of scattering points which will give rise to virtually any required diffraction pattern has been extended to include the possibility of multiple symmetry-related sites per unit cell. The distribution may be used in the form of an optical diffraction screen to give an immediate visual check on both the real-space and reciprocal-space distributions. The method has been applied successfully to two examples which exhibit strong diffuse X-ray scattering effects: a molecular crystal sample, 1,3-dibromo-2,5-diethyl-4,6-dimethylbenzene (BEMB2), in which disorder occurs because the molecule can take up two different orientations in any given molecular site, and a mineral mullite, Al2(Al2 + 2xSi2 − 2x)O10 − x⊗x, where disorder diffuse scattering occurs as a result of the oxygen vacancies ⊗ and the accompanying cation displacements.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S002188989000379X
