Sodium ion conduction in sodium lanthanum zirconate ceramics prepared by spark plasma sintering

Naoto Toyomura, George Hasegawa, Kazuma Nishimi, Miki Inada, Naoya Enomoto, Katsuro Hayashi

Research output: Contribution to journalArticlepeer-review

Abstract

Dense ceramics of Na3xLa2/3−xZrO3−δ with orthorhombic (Pnma) perovskite structure have been prepared by spark plasma sintering (SPS) to investigate their Na+ ion conducting behaviors combining with crystal chemistry. Despite of suppressed Na volatilization owing to the SPS technique, the Na component tends to be partially lost during sintering, and consequently, the chemical composition of perovskite is limited to a small range, 3x = 0.32–0.35, which is favored under an equilibration with secondary phases of La2Zr2O7 pyrochlore and ZrO2. A sample with Na0.32La0.48ZrO2.9 exhibits an enhanced bulk conductivity (7.2 × 10−5 S cm−1 at 350 °C) and a much lower activation energy (0.26 eV) as compared with those observed in isostructural titanate-derivative of Na3xLa2/3−xTiO3, indicating that the expanded perovskite lattice by the Zr-substitution for Ti offers migration pathways wide enough for Na+ ion.

Original languageEnglish
Article number113887
JournalScripta Materialia
Volume200
DOIs
Publication statusPublished - Jul 15 2021

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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