High Oxide Ion Conductivity of (Ba1-x-ySrxLay)InO2.5+y/2 Members Derived from the Ba2In2O5 System |
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| Journal | Defect and Diffusion Forum (Volumes 242 - 244) |
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| Volume | Defects and Diffusion in Ceramics - An Annual Retrospective VII |
| Edited by | David J. Fisher |
| Pages | 159-168 |
| DOI | 10.4028/www.scientific.net/DDF.242-244.159 |
| Citation | Katsuyoshi Kakinuma et al., 2005, Defect and Diffusion Forum, 242-244, 159 |
| Authors | Katsuyoshi Kakinuma, Hiroshi Yamamura, Tooru Atake |
| Keywords | Brownmillerite Structure, Order-Disorder Transition, Oxide Ion Conductivity, Perovskite Structure, Solid Oxide Fuel Cell (SOFC), Unit Cell Free Volume |
| Abstract | We have discovered a high oxide ion conductor within the perovskite-type (Ba1-x-ySrxLay)InO2.5+y/2 solid-solution system. The system was derived from brownmillerite-type Ba2In2O5, which possessed a ordered oxide ion vacancies. When we doped La3+ into the Ba site, the vacancy changed to a disordered state. The oxide ion conductivity increased with the amount of doped La3+, reaching a maximum value of 0.12 (S/cm) at 800 oC in (Ba0.3Sr0.2La0.5)InO2.75, a level exceeding that of yttria-stabilized zirconia. The oxide ion conductivity of this system was strongly dependent on the unit cell free volume, which appears to be the key parameter governing oxide ion mobility. |
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