Ionic and electronic conductivities of homogeneous and heterogeneous materials in the system ZrO2In2O3

L. J. Gauckler, Kazunari Sasaki

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Abstract

In the system ZrO2In2O3, the In2O3-doped ZrO2 phases (cubic, tetragonal and t́) exhibit high ionic conductivity and the ZrO2-doped In2O3 high electronic conductivity. These phases are in thermodynamic equilibrium at high temperatures. The ionic conductivity of ZrO2 depends on the crystal symmetry having the same In2O3 concentration. At 1000 °C, the highest conductivities were obtained for cubic ZrO2 doped with 25 mol% InO1.5. At lower concentrations, the ionic conductivity of cubic-ZrO2 decreases due to a first-order phase transformation to the tetragonal (t́) form. Single-phase In2O3 doped with ZrO2 is an n-type electronic conductor with a conductivity of up to 7 × 104 S m in air. Point defect models for electronic conduction in In2O3 doped with ZrO2 are discussed. Two maxima in the electronic conductivity have been found: one in the two-phase region and one in the InO1.5 single phase region. In the heterogeneous two-phase material cubic-ZrO2 + InO1.5, the electronic conductivity increases abruptly up to 104 S m with increasing InO1.5 concentration. This material is a three-dimensional composite of ion- and electron-conducting phases. The origin of the maximum in electrical conductivity in the heterogeneous two-phase region is discussed.

Original languageEnglish
Pages (from-to)203-210
Number of pages8
JournalSolid State Ionics
Volume75
Issue numberC
DOIs
Publication statusPublished - Jan 1 1995

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Ionic conductivity
ion currents
conductivity
electronics
Crystal symmetry
Point defects
three dimensional composites
conduction
Phase transitions
Thermodynamics
Ions
thermodynamic equilibrium
Electrons
point defects
Composite materials
phase transformations
low concentrations
Air
conductors
electrical resistivity

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Ionic and electronic conductivities of homogeneous and heterogeneous materials in the system ZrO2In2O3. / Gauckler, L. J.; Sasaki, Kazunari.

In: Solid State Ionics, Vol. 75, No. C, 01.01.1995, p. 203-210.

Research output: Contribution to journalArticle

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N2 - In the system ZrO2In2O3, the In2O3-doped ZrO2 phases (cubic, tetragonal and t́) exhibit high ionic conductivity and the ZrO2-doped In2O3 high electronic conductivity. These phases are in thermodynamic equilibrium at high temperatures. The ionic conductivity of ZrO2 depends on the crystal symmetry having the same In2O3 concentration. At 1000 °C, the highest conductivities were obtained for cubic ZrO2 doped with 25 mol% InO1.5. At lower concentrations, the ionic conductivity of cubic-ZrO2 decreases due to a first-order phase transformation to the tetragonal (t́) form. Single-phase In2O3 doped with ZrO2 is an n-type electronic conductor with a conductivity of up to 7 × 104 S m in air. Point defect models for electronic conduction in In2O3 doped with ZrO2 are discussed. Two maxima in the electronic conductivity have been found: one in the two-phase region and one in the InO1.5 single phase region. In the heterogeneous two-phase material cubic-ZrO2 + InO1.5, the electronic conductivity increases abruptly up to 104 S m with increasing InO1.5 concentration. This material is a three-dimensional composite of ion- and electron-conducting phases. The origin of the maximum in electrical conductivity in the heterogeneous two-phase region is discussed.

AB - In the system ZrO2In2O3, the In2O3-doped ZrO2 phases (cubic, tetragonal and t́) exhibit high ionic conductivity and the ZrO2-doped In2O3 high electronic conductivity. These phases are in thermodynamic equilibrium at high temperatures. The ionic conductivity of ZrO2 depends on the crystal symmetry having the same In2O3 concentration. At 1000 °C, the highest conductivities were obtained for cubic ZrO2 doped with 25 mol% InO1.5. At lower concentrations, the ionic conductivity of cubic-ZrO2 decreases due to a first-order phase transformation to the tetragonal (t́) form. Single-phase In2O3 doped with ZrO2 is an n-type electronic conductor with a conductivity of up to 7 × 104 S m in air. Point defect models for electronic conduction in In2O3 doped with ZrO2 are discussed. Two maxima in the electronic conductivity have been found: one in the two-phase region and one in the InO1.5 single phase region. In the heterogeneous two-phase material cubic-ZrO2 + InO1.5, the electronic conductivity increases abruptly up to 104 S m with increasing InO1.5 concentration. This material is a three-dimensional composite of ion- and electron-conducting phases. The origin of the maximum in electrical conductivity in the heterogeneous two-phase region is discussed.

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