Characterisation of the cation ordering, oxygen vacancy distribution and proton sites in hexagonal and cubic BaTi1-xScxO3-d
Sc-doped BaTiO3 shows promising proton conducting characteristics. This system undergoes a structural phase transition from a cubic perovskite to a 6H perovskite structure as the Sc doping decreases. The hydration behaviour within the series is indicative of filling oxide ion vacancies and we find that the proton conductivity is significantly lower in the hexagonal structure. Neutron powder diffraction will be used to study the cation ordering and oxygen ion vacancy distributions in the host materials as a function of Sc doping to investigate the structural driving force for the phase transition. Additionally, the proton positions in hydrated materials will be determined in order to understand the difference in the observed conductivity properties.
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RAHMAN Seikh; ERIKSSON Sten; HENRY Paul; KNEE Christopher; NORBERG STEFAN; SUARD Emmanuelle and TORINO Nico. (2015). Characterisation of the cation ordering, oxygen vacancy distribution and proton sites in hexagonal and cubic BaTi1-xScxO3-d. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-21-1086
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