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

Journal Article · Mon Mar 15 04:00:00 EDT 2010 · Crystallography Reports

DOI:https://doi.org/10.1134/S1063774510020057· OSTI ID:22051230

Verin, I A; Sorokina, N I; Novikova, N E ^[1]; Kolesnikova, D S; Voronkova, V I ^[2]

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1. Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)
2. Moscow State University (Russian Federation)

The structure of the cubic metastable {beta}{sub ms} phase of La{sub 2}Mo{sub 2}O{sub 9} 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.

• OSTI ID: 22051230
• Journal Information: Crystallography Reports, Journal Name: Crystallography Reports Journal Issue: 2 Vol. 55; ISSN CYSTE3; ISSN 1063-7745
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CUBIC LATTICES
LANTHANUM COMPOUNDS
MOLYBDATES
MONOCRYSTALS
SYMMETRY
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
X-RAY DIFFRACTION