Single-crystal structure of vanadium-doped La{sub 2}Mo{sub 2}O{sub 9}

Journal Article · Fri Nov 15 04:00:00 EST 2013 · Crystallography Reports

DOI:https://doi.org/10.1134/S1063774513060035· OSTI ID:22210425

Antipin, A. M. ^[1]; Gagor, A.; Pietraszko, A. ^[2]; Novikova, N. E.; Sorokina, N. I. ^[1]; Kharitonova, E. P.; Voronkova, V. I. ^[3]

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1. Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)
2. Polish Academy of Sciences, Trzebiatowski Institute of Low Temperature and Structure Research (Poland)
3. Moscow State University (Russian Federation)

A high-precision X-ray diffraction study of single crystals of two compositions-La{sub 2}Mo{sub 1.78}V{sub 0.22}O{sub 8.89} and La{sub 2}Mo{sub 1.64}V{sub 0.36}O{sub 8.82}-was performed. In the vanadium-doped compounds, as in the structure of the metastable {beta}{sub ms} phase of pure La{sub 2}Mo{sub 2}O{sub 9}, the La and Mo atoms and one of the three oxygen atoms are displaced from the threefold axis, on which they are located in the high-temperature {beta} phase. The structure contains two partially occupied oxygen sites. It was shown that molybdenum atoms are partially replaced by vanadium atoms, which are not involved in the disordering, are located on the threefold axis, and are shifted toward one of the oxygen atoms. This is consistent with the temperature-induced changes in the structure of La{sub 2}Mo{sub 2}O{sub 9} and the changes in the properties of these crystals caused by the introduction of vanadium atoms into the structure.

• OSTI ID: 22210425
• Journal Information: Crystallography Reports, Journal Name: Crystallography Reports Journal Issue: 6 Vol. 58; ISSN 1063-7745; ISSN CYSTE3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACCURACY
DOPED MATERIALS
MONOCRYSTALS
OXYGEN
VANADIUM
X-RAY DIFFRACTION