Superspace approach applied to a neutron-diffraction study of the holographic data storage material Sr0.61Ba0.39Nb2O6

Autor(en): Schaniel, D
Schefer, J
Petricek, V
Imlau, M 
Pankrath, R
Granzow, T
Woike, T
Stichwörter: Materials Science; Materials Science, Multidisciplinary; Physics; Physics, Applied; STRONTIUM; SYMMETRY
Erscheinungsdatum: 2002
Herausgeber: SPRINGER HEIDELBERG
Enthalten in: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Band: 74
Ausgabe: 2, S
Startseite: S963-S965
Zusammenfassung: 
We investigated the incommensurately modulated structure of Sr0.61Ba0.39Nb2O6 by means of single-crystal neutron diffraction. With the measured 620 satellite reflections we could verify the two modulation vectors Q(1,2) = (0.3075, /-0.3075, 0.5) known from X-ray-diffraction experiments. As neutrons are much more sensitive to oxygen atoms than X-rays, we performed structural refinement of the oxygen atoms using the superspace approach. The largest amplitude for positional modulation was found for those oxygen atoms lying in the same plane (z = const.) as the Sr and Ba atoms. The final R values for main and satellite reflections are 0.063 and 0.153, respectively.
Beschreibung: 
International Conference on Neutron Scattering, MUNICH, GERMANY, SEP 09-13, 2001
ISSN: 09478396
DOI: 10.1007/s003390101157

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