Valence state of europium and samarium in Ln2Hf2O7 (Ln = Eu, Sm) based oxygen ion conductors

A. V. Shlyakhtina, N. V. Lyskov, A. N. Shchegolikhin, I. V. Kolbanev, S. A. Chernyak, E. Yu Konysheva

Research output: Journal PublicationArticlepeer-review

5 Citations (Scopus)

Abstract

Ln2(Hf2-xLnx)O7-x/2 (Ln = Sm, Eu; x = 0.1) pyrochlores have been prepared via mechanical activation of oxide mixtures, followed by heat treatment for 4h at 1450 and 1600 °C, respectively. According to the ESR data, the Eu cations on the Hf site in the Hf1-xEuxO6 octahedra in pyrochlore Eu2(Hf2-xEux)O7-x/2 (x = 0.1) are most readily oxidized and reduced. Oxidation at 840 °C for 24h in air reduces the total conductivity of the Ln2(Hf2-xLnx)O7-x/2 (Ln = Sm, Eu; x = 0.1) by a factor of 2.5–6, due to the decrease in the concentrations of oxygen vacancies and Ln2+ ions as a result of the oxidation. The anomalous low-frequency behavior of the permittivity of the Eu2(Hf2-xEux)O7-x/2 (x = 0.1) at ~800 °C can be understood in terms of the changes in the oxygen sublattice of the pyrochlore structure as a result of the oxidation of divalent europium and partial filling of oxygen vacancies at this temperature.

Original languageEnglish
Pages (from-to)26898-26906
Number of pages9
JournalCeramics International
Volume47
Issue number19
DOIs
Publication statusPublished - 1 Oct 2021

Keywords

  • Electron spin resonance spectroscopy
  • Eu2Hf2O7
  • Oxygen-ion conductivity
  • Permittivity
  • Pyrochlore
  • Raman spectroscopy
  • Sm2Hf2O7
  • XRD

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