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Quasielastic Neutron Scattering and Solid State Diffusion$
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Rolf Hempelmann

Print publication date: 2000

Print ISBN-13: 9780198517436

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198517436.001.0001

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Solid state proton conductors

Solid state proton conductors

(p.251) 11 Solid state proton conductors
Quasielastic Neutron Scattering and Solid State Diffusion

Rolf Hempelmann

Oxford University Press

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.

Keywords:   solid proton conductor, aliovalently doped perovskite, hydrogen bonded system, Grotthuss mechanism

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