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- W2051567319 abstract "Ba2YSnO5.5 is found to crystallize in a perovskite structure with a=848 pm. The compound may be hydrated (ΔHhydr.°=−101.5 kJ mol−1, ΔShydr.°=−92.5 J mol−1 K−1) to a high degree (maximum water content=13.5 mol%) which leads to the formation of protonic charge carriers (OHO⋅) and the occurrence of very high proton conductivity with low activation enthalpy (Ea=0.51 eV) comparable to that of BaCeO3 based materials which are the oxides with the highest proton conductivities reported so far. The conductivity contributions from native ions (VO⋅⋅, h⋅) are found to be negligible for temperatures below 600°C. In contrast to BaCeO3 based materials Ba2YSnO5.5 shows good chemical durability with respect to carbonate formation. However, structural instability becomes apparent in a high grain boundary impedance, a collapse of the structure upon reduction and the macrocracking induced by lattice strain resulting from hydration." @default.
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- W2051567319 date "1997-06-01" @default.
- W2051567319 modified "2023-10-03" @default.
- W2051567319 title "High proton conductivity in barium yttrium stannate Ba2YSnO5.5" @default.
- W2051567319 cites W1875689429 @default.
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- W2051567319 doi "https://doi.org/10.1016/s0167-2738(97)00102-1" @default.
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