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Title: Synthesis, structure and properties of Na[AsW{sub 2}O{sub 9}]

Single crystal and polycrystalline powder samples of sodium arseno-tungstate of composition Na[AsW{sub 2}O{sub 9}] were synthesized using high-temperature solid-state methods. The greenish single crystals of the phase were characterized by X-ray diffraction data structure determination and the bulk compound confirmed by powder X-ray data Rietveld refinements. Additionally, scanning electron microscopy (SEM) attached with energy dispersive X-Ray spectroscopy (EDX), thermogravimetry (TG), differential scanning calorimetry (DSC), fourier transform infrared (FTIR) and Raman spectroscopy was performed. A comparative study between Na[AsW{sub 2}O{sub 9}] and isotypic K[AsW{sub 2}O{sub 9}] demonstrates the structural modifications and the consequent properties. Placing sodium in the channel of the arseno-tungstate framework, the average As-O and W-O bond distances did not change due to their rigid-unit like behaviors. However, the unit cell volume contracted about 7.4% caused by shrinkage of the channel dimensions due to shorter Na-O bond distances. The non-linear optical property of the compound has been explained in terms of asymmetric W-O and As-O chemical bonding led by WO{sub 6} and AsO{sub 4} polyhedral distortion, respectively.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [6] ;  [1]
  1. Chemische Kristallographie fester Stoffe, Institut für Anorganische Chemie (FB02), Universität Bremen, Leobener Straße, D-28359 Bremen (Germany)
  2. Institute of Energy and Climate Research (IEK-6), Forschungszentrum Jülich, D-52428 Jülich (Germany)
  3. (Germany)
  4. Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Pr. Lavrentyeva 13, Novosibirsk 630090 (Russian Federation)
  5. (Russian Federation)
  6. Laboratory of Condensed Matter Spectroscopy, Institute of Automation and Electrometry, SB RAS, Novosibirsk 90, 630090 (Russian Federation)
Publication Date:
OSTI Identifier:
22420673
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 60; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; ARSENATES; BOND LENGTHS; CALORIMETRY; CHEMICAL BONDS; CRYSTAL STRUCTURE; FOURIER TRANSFORMATION; INFRARED SPECTRA; MONOCRYSTALS; NONLINEAR OPTICS; OPTICAL PROPERTIES; POLYCRYSTALS; RAMAN SPECTROSCOPY; SCANNING ELECTRON MICROSCOPY; SODIUM COMPOUNDS; THERMAL GRAVIMETRIC ANALYSIS; TUNGSTATES; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY