Solid state proton conductors
Aliovalently doped perovskite-type oxides (e.g., SrCeO3 doped with Yb2O3) contain, for reasons of charge neutrality, oxygen vacancies and become high temperature proton conductors in the presence of water. Proton conductivity is due to OH- ions on oxygen sites and to proton hopping from oxygen to oxygen according to the Grotthuss mechanism. This chapter examines aliovalently doped perovskites both by QENS and by muon spin rotation. It evaluates the QENS data in terms of the two-state model. Hydrogen bonded systems like CsHSO4 are another class of solid proton conductors. For these compounds, QENS also delivers an atomistic picture of proton diffusion. Another proton carrier is NH3 intercalated in molybdenum bronzes.
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