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Structure of incommensurately modulated chromium pyrophosphate studied by Maximum Entropy Method (MEM)

Title data

Li, Liang ; Schönleber, Andreas ; van Smaalen, Sander:
Structure of incommensurately modulated chromium pyrophosphate studied by Maximum Entropy Method (MEM).
In: Journal of Physics: Conference Series. Vol. 226 (2010) Issue 1 . - 012012.
ISSN 1742-6596
DOI: https://doi.org/10.1088/1742-6596/226/1/012012

Official URL: Volltext

Abstract in another language

A general discussion is given of the Maximum Entropy Method (MEM) as a method to determine the electron density in superspace from X-ray diffraction data. The MEM has been used to determine the electron density in superspace of incommensurately modulated chromium pyrophosphate from X-ray diffraction data published by Palatinus et al. Acta Crystallogr. B 62, 556. Chromium pyrophosphate, Cr 2 P 2 O 7 , contains ordered regions (83% of the volume) and regions with disorder. Analysis of the MEM density has allowed us to determine the displacive modulation functions within the ordered regions. The disordered regions can be described as the alternate occupation of two conformations of the pyrophosphate unit and two positions of the chromium atom. Both the conformations and the occupational probabilities of them depend continuously on the phase of modulation t.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography > Chair Crystallography - Univ.-Prof. Dr. Sander van Smaalen
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 31 Jul 2015 07:30
Last Modified: 31 Jul 2015 07:30
URI: https://eref.uni-bayreuth.de/id/eprint/17462