TEMPERATURE-DEPENDENCE OF THE STATIC DISTORTION IN INCOMMENSURATE DISPLACIVE PHASES AND ITS EFFECT ON THE DIFFRACTION PATTERN .1. MAIN REFLECTIONS

Authors
ARAMBURU I MADARIAGA G PEREZMATO JM
Citation
I. Aramburu et al., TEMPERATURE-DEPENDENCE OF THE STATIC DISTORTION IN INCOMMENSURATE DISPLACIVE PHASES AND ITS EFFECT ON THE DIFFRACTION PATTERN .1. MAIN REFLECTIONS, Acta crystallographica. Section A, Foundations of crystallography, 53, 1997, pp. 329-333
Citations number
16
Categorie Soggetti
Crystallography
Journal title
Acta crystallographica. Section A, Foundations of crystallography → ACNP
ISSN journal
01087673
Volume
53
Year of publication
1997
Part
3
Pages
329 - 333
Database
ISI
SICI code
0108-7673(1997)53:<329:TOTSDI>2.0.ZU;2-Q
Abstract
The effect of the temperature dependence of the structural modulation on the intensity of main reflections is analyzed. A simple expression for the atomic scattering modulation factors has been derived describi ng the structural distortion in terms of the amplitude and the inhomog eneous phase of the order parameter. According to this expression, som e main reflections can be strongly influenced by modulation harmonics. Owing to this influence, the intensity of some main reflections can i ncrease, decrease or even show a pronounced minimum as the temperature is lowered. These results are experimentally verified in thiourea.