Control of mixed protonic and electronic conductivity by mixing rare-earth ortho-borates

Hayato Takahashi, Atsushi Unemoto, Koji Amezawa, Tatsuya Kawada

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


In order to develop mixed protonic and electronic conductors, we proposed a novel concept for material design that enables to control partial conductivities by fabricating solid solutions of protonic and electronic conductors. In this work, Sr-doped LaBO3 and Sr-doped CeBO 3 were chosen as model compounds conducting protons and electron holes, respectively. Solid solutions of the above borates, Sr-doped La 1 - xCexBO3, were prepared, and their electrical conductivities were investigated in 8.5 × 102-4.2 × 103 Pa of p(H2O) and 1.0 × 10-1.0 × 105 Pa of p(H2) at 1073 K. From the experimental results of the gas partial pressure dependences of the conductivities, major charge carrier species were identified as a function of x. It was found that proton was the major charge carrier when x < 0.2 while the contribution of the electron hole conduction became remarkable as x increased above 0.2. The contribution of the electron hole conduction can be interpreted by the percolation model.

Original languageEnglish
Pages (from-to)275-278
Number of pages4
JournalSolid State Ionics
Issue number1
Publication statusPublished - 2011 Jun 16


  • Conductivity control
  • Electron hole conduction
  • Mixed conductor
  • Proton conduction
  • Rare-earth ortho-borates


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