Genesis, structural, and transport properties of La2Mo2-xWxO9 prepared via mechanochemical activation

S. Pavlova, Y. Bespalko, T. Krieger, V. Sadykov, N. Uvarov

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Fast oxide-ion conductors La2Mo2-xWxO9 (x = 0–1) have been prepared using mechanochemical activation (MA) of starting oxides in a high-power planetary ball mill. Studies of La2Mo2-xWxO9 genesis and structural properties using thermal analysis, XRD, SEM, IR, and Raman spectroscopy have revealed that MA results in the formation of an amorphous precursor, while the cubic β-phase is formed after calcination at 700–900 °C. Due to a high dispersion of powders, high-density pellets of W-LAMOX ceramics have been obtained already after sintering at 950 °C. Their electrical conductivity measured by the impedance spectroscopy depends on the W concentration being sufficiently high (up to 5.6∙10−3 S/cm at 630 °C) at temperatures below 650 °C.

Original languageEnglish
Pages (from-to)877-887
Number of pages11
JournalIonics
Volume23
Issue number4
DOIs
Publication statusPublished - 1 Apr 2017

Keywords

  • Doping
  • FTIR
  • Ionic conductivities
  • Materials preparations
  • XRD
  • RAMAN-SPECTRA
  • SUBSTITUTED LA2MO2O9
  • STABILITY
  • ELECTRICAL-CONDUCTIVITY
  • LAMOX
  • OXIDE-ION CONDUCTORS
  • REDUCIBILITY
  • ND
  • PHASE-TRANSITION
  • GD

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