All in all, even though proton concentrations for the hydrating compositions are relatively low – up to around 1 mol% under oxidising conditions – the results show a clear trend: Significant hydration is seen only for compositions where the lanthanides have either empty (La), half-full (Gd), or full (Lu) 4f-shells.
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Governing principles of hydration of mixed proton conducting Co-based double perovskites.
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