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Title: New double molybdate Na{sub 9}Fe(MoO{sub 4}){sub 6}: Synthesis, structure, properties

A new double molybdate Na{sub 9}Fe(MoO{sub 4}){sub 6} was synthesized using solid state reactions and studied with X-ray powder diffraction, second harmonic generation (SHG) technique, differential scanning calorimetry, X-ray fluorescence analysis, Mössbauer and dielectric impedance spectroscopy. Single crystals of Na{sub 9}Fe(MoO{sub 4}){sub 6} were obtained and its structure was solved (the space group R3{sup ¯}, a=14.8264(2), c=19.2402(3) Å, V=3662.79(9) Å{sup 3}, Z=6, R=0.0132). The structure is related to that of sodium ion conductor II-Na{sub 3}Fe{sub 2}(AsO{sub 4}){sub 3}. The basic structure units are polyhedral clusters composed of central FeO{sub 6} octahedron sharing edges with three Na(1)O{sub 6} octahedra. The clusters share common vertices with bridging MoO{sub 4} tetrahedra to form an open 3D framework where the cavities are occupied by Na(2) and Na(3) atoms. The compound melts incongruently at 904.7±0.2 K. Arrhenius type temperature dependence of electric conductivity σ has been registered in solid state (σ=6.8×10{sup −2} S cm{sup −1} at 800 K), thus allowing considering Na{sub 9}Fe(MoO{sub 4}){sub 6} as a new sodium ion conductor. - Graphical abstract: A new double molybdate Na{sub 9}Fe(MoO{sub 4}){sub 6} was synthesized and structurally characterized, its physicochemical properties were studied. Display Omitted - Highlights: • A new compound Na{sub 9}Fe(MoO{sub 4}){sub 6} wasmore » synthesized as ceramics and single crystals. • Na{sub 9}Fe(MoO{sub 4}){sub 6} structure is related to that of sodium-ion conductor II-Na{sub 3}Fe{sub 2}(AsO{sub 4}){sub 3}. • Physicochemical properties of the compound were studied. • Arrhenius plot for conductivity showed 6.8×10{sup −2} S cm{sup −1} at 800 K, E{sub a}∼0.8 eV. • Thus, Na{sub 9}Fe(MoO{sub 4}){sub 6} may be considered as a new sodium ion conductor.« less
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [1] ;  [3] ; ;  [4] ;  [3] ; ;  [4] ;  [1] ;  [2]
  1. Baikal Institute of Nature Management, Siberian Branch, Russian Academy of Sciences, Sakh'yanova Street 6, Ulan-Ude 670047, Buryat Republic (Russian Federation)
  2. (Russian Federation)
  3. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Akademik Lavrentyev Avenue 3, Novosibirsk 630090 (Russian Federation)
  4. Department of Chemistry, Moscow State University, Moscow 119899 (Russian Federation)
Publication Date:
OSTI Identifier:
22274083
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 205; Other Information: Copyright (c) 2013 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:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ARSENATES; CALORIMETRY; CERAMICS; CRYSTAL STRUCTURE; ELECTRIC CONDUCTIVITY; ELECTROLYTES; HARMONIC GENERATION; IRON OXIDES; MOLYBDATES; MONOCRYSTALS; SODIUM IONS; SOLIDS; SPACE GROUPS; SPECTROSCOPY; SYNTHESIS; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION; X-RAY FLUORESCENCE ANALYSIS