Synthesis, crystal structure and properties of alluaudite-like triple molybdate Na25Cs8Fe5(MoO4)24

Aleksandra A. Savina, Sergey F. Solodovnikov, Dmitry A. Belov, Olga M. Basovich, Zoya A. Solodovnikova, Konstantin V. Pokholok, Sergey Yu Stefanovich, Bogdan I. Lazoryak, Elena G. Khaikina

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26 Citations (Scopus)

Abstract

A new triple molybdate Na25Cs8Fe5(MoO4)24was synthesized using solid state reactions and studied with X-ray powder diffraction, second harmonic generation (SHG) technique, differential scanning calorimetry, Mössbauer and dielectric impedance spectroscopy. Single crystals of Na25Cs8Fe5(MoO4)24were obtained and its structure was solved (the space group P1¯, a=12.5814(5), b=13.8989(5), c=28.4386(9) Å, α=90.108(2), β=90.064(2), γ=90.020(2)°, V=4973.0(3) Å3, Z=2, R=0.0440). Characteristic features of the structure are polyhedral layers composed of pairs of edge-shared FeO6and (Fe, Na)O6octahedra, which are connected by bridging MoO4tetrahedra. The layers share common vertices with bridging MoO4tetrahedra to form an open 3D framework with the cavities occupied by the Cs+and Na+cations. The compound undergoes first-order phase transformation at 642 K and above this phase transition, electrical conductivity reaches 10-3-10-2S cm-1. Thus, Na25Cs8Fe5(MoO4)24may be considered as a promising compound for developing new materials with high ionic conductivity.

Original languageEnglish
Pages (from-to)217-220
Number of pages4
JournalJournal of Solid State Chemistry
Volume220
DOIs
Publication statusPublished - Dec 2014
Externally publishedYes

Keywords

  • Crystal structure
  • Ionic conductivity
  • Phase transition
  • Sodium
  • Synthesis
  • Triple molybdate

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