Abstract
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 language | English |
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Pages (from-to) | 275-278 |
Number of pages | 4 |
Journal | Solid State Ionics |
Volume | 192 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2011 Jun 16 |
Keywords
- Conductivity control
- Electron hole conduction
- Mixed conductor
- Proton conduction
- Rare-earth ortho-borates
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics