Effect of microstructure on electrical and mechanical properties of La5.4WO12-δ proton conductor

Wendelin Deibert* (Corresponding Author), Vasiliki Stournari, Mariya E. Ivanova, Sonia Escolástico, José M. Serra, Jürgen Malzbender, Tilmann Beck, Lorenz Singheiser, Olivier Guillon, Wilhelm A. Meulenberg

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

The relationships between microstructural characteristics and electrical as well as mechanical properties of La5.4WO12-δ (LWO54) materials were studied. Polycrystalline LWO54 samples revealed identical transport mechanisms regardless of the sample microstructure. The studied samples show predominately proton conductor behaviour below 800 °C and become predominant n-type and oxygen ion conductors above this temperature. The magnitude of the total conductivity is enhanced with larger grain size and lower porosity. Young's modulus decreased by 20% with increasing temperature up to 1000 °C regardless of grain size and atmosphere. Fracture strength was determined via ring-on-ring bending tests, yielding values that strongly depended on microstructural characteristics and homogeneity of the microstructure. Elevated temperature deformation studies revealed that creep is governed by cation diffusion mechanism.

Original languageEnglish
Pages (from-to)3527-3538
Number of pages12
JournalJournal of the European Ceramic Society
Volume38
Issue number10
Early online date7 Apr 2018
DOIs
Publication statusPublished - 1 Aug 2018

Keywords

  • Conductivity
  • Creep
  • Lanthanum tungstate
  • Mechanical properties
  • Proton-Conducting ceramic membranes
  • Strength

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