Synthesis, Crystal Structure, and Properties of the Alluaudite-Type Vanadates Ag2-xNaxMn2Fe(VO4)3

Hamdi Yahia, Masahiro Shikano, Mitsuharu Tabuchi, Ilias Belharouak

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The new members of the Ag2-xNaxMn2Fe(VO4)3 (0 ≤ x ≤ 2) solid solution were synthesized by a solid-state reaction route, and their crystal structures were determined from single-crystal X-ray diffraction data. The physical properties were characterized by Mössbauer and electrochemical impedance spectroscopies, galvanostatic cycling, and cyclic voltammetry. These materials crystallize with a monoclinic symmetry (space group C2/c), and the structure is considered to be a new member of the AA′MM′2(XO4)3 alluaudite family. The A, A′, M, and X sites are fully occupied by Ag+/Na+, Ag+/Na+, Mn2+, and V5+, respectively, whereas a Mn2+/Fe3+ mixture is observed in the M′ site. The Mössbauer spectra confirm that iron is trivalent. The impedance measurements indicate that the silver phase is a better conductor than the sodium phase. Furthermore, these phases exhibit ionic conductivities 2 orders of magnitude higher than those of the homologous phosphates. The electrochemical tests prove that Na2Mn2Fe(VO4)3 is active as positive and negative electrodes in sodium-ion batteries.

Original languageEnglish
Pages (from-to)4643-4649
Number of pages7
JournalInorganic Chemistry
Volume55
Issue number9
DOIs
Publication statusPublished - 2 May 2016

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Vanadates
vanadates
Crystal structure
Sodium
sodium
Dielectric Spectroscopy
crystal structure
impedance measurement
Ionic conductivity
synthesis
Solid state reactions
Electric Impedance
Electrochemical impedance spectroscopy
Silver
X-Ray Diffraction
ion currents
Cyclic voltammetry
electric batteries
Solid solutions
phosphates

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

Cite this

Synthesis, Crystal Structure, and Properties of the Alluaudite-Type Vanadates Ag2-xNaxMn2Fe(VO4)3 . / Yahia, Hamdi; Shikano, Masahiro; Tabuchi, Mitsuharu; Belharouak, Ilias.

In: Inorganic Chemistry, Vol. 55, No. 9, 02.05.2016, p. 4643-4649.

Research output: Contribution to journalArticle

Yahia, Hamdi ; Shikano, Masahiro ; Tabuchi, Mitsuharu ; Belharouak, Ilias. / Synthesis, Crystal Structure, and Properties of the Alluaudite-Type Vanadates Ag2-xNaxMn2Fe(VO4)3 In: Inorganic Chemistry. 2016 ; Vol. 55, No. 9. pp. 4643-4649.
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