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Y-doped barium cerate protonic conductors with composition BaCe 1−x Y x O 3−δ (x=0.02, 0.1, 0.2, 0.3) have been synthesized by sol–gel route, giving by X-ray diffraction tests a homogeneous crystalline phase. A commercial sample BaCe 0.8 Y 0.2 O 3−δ produced by combustion spray pyrolysis was also provided for comparison aim. The local structure around...
Yttrium-doped barium cerate is prototypical of a class of ceramic materials that incorporate water vapour into oxygen ion vacancies to produce interstitial protonic defects. At low to moderate oxygen pressures, where hole conductivity may be neglected, mixed oxygen ion/proton conduction is possible, resulting in ambipolar diffusion of protonic defects and oxygen ion vacancies. At low temperatures,...
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