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Crystal structure of the metastable cubic β ms phase of La 2 Mo 2 O 9 single crystal at T = 33 K

Crystal structure of the metastable cubic β ms phase of La 2 Mo 2 O 9 single crystal at T = 33 K Abstract The structure of the cubic metastable βms phase of La2Mo2O9 single crystal has been precisely investigated by X-ray diffraction at 33 K for the first time. The measurement of the unit-cell parameter of this crystal in the range from room temperature to 33 K showed that the unit-cell parameter and volume change continuously in this range. The crystal has a similar structure at T = 33 K and at room temperature. A local lowering of the symmetry for La and Mo atoms, caused by their displacement, is confirmed, and a similar displacement (which was not observed at room temperature) is revealed for O(1) atoms. The thermal parameters for O(2) and O(3) atoms do not change with a decrease in temperature, in contrast to the thermal parameters of Mo, La, and O(1) atoms. This fact indicates that the O(2) and O3 atoms in this crystal are statically disordered. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crystallography Reports Springer Journals

Crystal structure of the metastable cubic β ms phase of La 2 Mo 2 O 9 single crystal at T = 33 K

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References (11)

Publisher
Springer Journals
Copyright
2010 Pleiades Publishing, Ltd.
ISSN
1063-7745
eISSN
1562-689X
DOI
10.1134/s1063774510020057
Publisher site
See Article on Publisher Site

Abstract

Abstract The structure of the cubic metastable βms phase of La2Mo2O9 single crystal has been precisely investigated by X-ray diffraction at 33 K for the first time. The measurement of the unit-cell parameter of this crystal in the range from room temperature to 33 K showed that the unit-cell parameter and volume change continuously in this range. The crystal has a similar structure at T = 33 K and at room temperature. A local lowering of the symmetry for La and Mo atoms, caused by their displacement, is confirmed, and a similar displacement (which was not observed at room temperature) is revealed for O(1) atoms. The thermal parameters for O(2) and O(3) atoms do not change with a decrease in temperature, in contrast to the thermal parameters of Mo, La, and O(1) atoms. This fact indicates that the O(2) and O3 atoms in this crystal are statically disordered.

Journal

Crystallography ReportsSpringer Journals

Published: Mar 1, 2010

Keywords: Crystallography and Scattering Methods

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