Premium
Diffraction Anomalous Fine Structure on Forbidden and Superlattice Reflections
Author(s) -
Toda T.,
Nogami T.,
Yamasaki K.,
Soejima Y.
Publication year - 1998
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889897015033
Subject(s) - superlattice , superstructure , reflection (computer programming) , diffraction , absorption (acoustics) , condensed matter physics , oscillation (cell signaling) , spatial dispersion , polarization (electrochemistry) , chemistry , amplitude , reflection symmetry , symmetry (geometry) , molecular physics , optics , physics , biochemistry , geometry , mathematics , computer science , thermodynamics , programming language
The phenomenon of diffraction anomalous fine structure (DAFS) has been examined in relation to structural symmetry and is discussed for PbZrO 3 in the space group Pbam . It is found that DAFS appears on the superlattice reflection, even if the intensity of the reflection is free from the anomalous dispersion of heavy atoms at the relevant absorption edges. For reflections that are forbidden by the glide symmetry, DAFS oscillation can be observed, unaffected by the influence of absorption and of X‐ray absorption fine structure oscillation; the amplitude of DAFS oscillation depends on the polarization of incident X‐rays. The role of DAFS signals in superstructure investigation is discussed with respect to highly absorbing crystals of finite size.