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Katzke, Hannelore ; Czank, M. ; Depmeier, Wulf ; van Smaalen, Sander:
The stoichiometric dependence of the modulation wave vector in the incommensurately modulated structures of ∈-LiₓV₂O₅ and ∈ʻ-LiₓV₂O₅.
In: Journal of Physics: Condensed Matter.
Bd. 9
(1997)
Heft 29
.
- S. 6231-6239.
ISSN 1361-648X
DOI: https://doi.org/10.1088/0953-8984/9/29/008
Abstract
Electron diffraction was used to study the stoichiometric dependence of the modulation wave vector in the incommensurately modulated structures of ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img9.gif - and ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img10.gif . For ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img11.gif and ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img12.gif the space group of the basic structure is Pmmn, and the superspace group characterizing the one-dimensionally modulated structure is found to be ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img13.gif . The stoichiometry dependence of the modulation wave vector q can be described by a staircase function, with ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img14.gif being constant at ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img15.gif for ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img16.gif . A second plateau has been observed in the stability field of ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img10.gif for ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img18.gif with ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img19.gif . For the stoichiometry range ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img20.gif varies continuously between ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img19.gif and ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img22.gif . In the present paper we will show that the system ##IMG## http://ej.iop.org/images/0953-8984/9/29/008/img23.gif can be described by an extended Frenkel - Kontorova model. Despite its extreme simplicity in the one-dimensional case, the model exhibits most of the features necessary for understanding the variation of the dependence of the modulation wave vector on the lithium stoichiometry.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften > Lehrstuhl Kristallographie Fakultäten Fakultäten > Fakultät für Mathematik, Physik und Informatik Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 530 Physik |
| Eingestellt am: | 14 Jun 2016 13:26 |
| Letzte Änderung: | 31 Jan 2018 13:13 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/32678 |