Structural and transport properties of neodymium tungstates prepared via mechanochemical activation

Y. Bespalko, N. Eremeev, P. Skryabin, T. Krieger, Y. Chesalov, O. Lapina, D. Khabibulin, A. Ulihin, N. Uvarov, V. Sadykov

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Nd5.5WO11.25-δ, (Nd5/6La1/6)5.5WO11.25-δ and Nd5.5W0.5Mo0.5O11.25-δ mixed oxides have been prepared using mechanochemical activation (MA) of Nd2O3-WO3, Nd2O3-La2O3-WO3, Nd2O3-MoO3-WO3 mixtures in a high-power planetary ball mill. Genesis of these tungstates structural properties was studied by XRD, SEM, TEM with EDX analysis, 1H NMR, IR and Raman spectroscopy. X-ray diffraction has revealed that MA results in formation of a pure fluorite structure already after milling. High-density ceramic pellets have been obtained after sintering at 1350 °C. Transport properties of Nd5.5WO11.25-δ mixed oxide were improved by the partial substitution of Nd with La in (Nd5/6La1/6)5.5WO11.25-δ and W with Mo in Nd5.5W0.5Mo0.5O11.25-δ samples. For all samples the electrical conductivity values measured in a humid atmosphere (up to ~ 10−3 S/cm at 550 °C) exceed those measured in a dry atmosphere indicating the proton character of conductivity.

Original languageEnglish
Pages (from-to)9529-9536
Number of pages8
JournalCeramics International
Volume45
Issue number7
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • Proton transport
  • Structure
  • Synthesis by mechanical activation
  • Tungstate
  • STABILITY
  • LANTHANUM TUNGSTATE
  • HYDROGEN PERMEATION
  • SEPARATION

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