Nanoscale building blocks in a novel lithium arsenotungsten bronze: Synthesis and characterization

Journal Article · Sun Mar 15 00:00:00 EDT 2015 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2015.02.009· OSTI ID:22475639

Zhao, Pei ^[1]; Huq, Ashfia ^[2]; Grossmann, Henrike K.; Mädler, Lutz ^[3]; Alekseev, Evgeny V. ^[4]; Gesing, Thorsten M. ^[1]

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1. Chemische Kristallographie fester Stoffe, Universität Bremen, Leobener Straße, D-28359 Bremen (Germany)
2. Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States)
3. Foundation Institute of Materials Science (IWT), Department of Production Engineering, University of Bremen, Badgasteiner Strasse 3, D-28359 Bremen (Germany)
4. Institute of Energy and Climate Research (IEK-6), Forschungszentrum Jülich, D-52428 Jülich, and Institut für Kristallographie, RWTH Aachen, Jägerstraße 17-19, D-52066 Aachen (Germany)

We report on a novel compound Li{sub 3}AsW{sub 7}O{sub 25} obtained by solid-state reaction and characterized by diffraction and spectroscopic methods. The bronze-type compound crystallizes in the orthorhombic space group Pbca with a=724.38(3) pm, b=1008.15(4) pm, c=4906.16(17) pm and Z=8. The structure is built up by chains of WO{sub 6} octahedra interconnected by AsO{sub 4} tetrahedra and WO{sub 6} octahedra forming a polyhedral arrangement as seen in intergrowth tungsten bronzes. The X-ray single crystal structure refinement allows solving the complex arsenotungstate framework. The powder neutron diffraction data analysis locates the lithium atoms. Thermal analysis showed that Li{sub 3}AsW{sub 7}O{sub 25} is stable up to its melting at 1135(3) K followed by a decomposition at 1182(5) K. The Kubelka–Munk treatment of the UV–vis spectrum revealed a wide band gap in the range of 2.84–3.40 eV depending on the presumed electron transition type. - Graphical abstract: Crystal structure of Li{sub 3}AsW{sub 7}O{sub 25} showing different schematic components. - Highlights: • A report on a novel compound Li{sub 3}AsW{sub 7}O{sub 25} obtained by solid-state reaction. • Chains and nano-blocks of WO{sub 6} octahedra and AsO{sub 4} tetrahedra formed a structure like intergrowth tungsten bronzes. • X-ray diffraction allowed solving the complex arsenotungstate framework. • Powder neutron diffraction data analysis locates the lithium atoms. • UV–vis spectrum revealed the band-gap.

• OSTI ID: 22475639
• Journal Information: Journal of Solid State Chemistry, Vol. 226; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
ARSENATES
ARSENIC COMPOUNDS
DATA ANALYSIS
DECOMPOSITION
ELECTRONS
ENERGY GAP
LITHIUM TUNGSTATES
MELTING
MONOCRYSTALS
NANOSTRUCTURES
NEUTRON DIFFRACTION
ORTHORHOMBIC LATTICES
POWDERS
THERMAL ANALYSIS
TUNGSTEN BRONZE
X-RAY DIFFRACTION