Structural characterisation of a pyrochlore solid solution in the Na2O●Bi2O3●TiO2 system

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3 days on POLARIS are requested to study three pyrochlore compositions in the Na2O●Bi2O3●TiO2 system that has been reported only once in the literature, without any characterisation. Unpublished electrical data shows low conductivity comparable to insulating Na0.5Bi0.51TiO3+δ perovskite but much lower than oxide-ion conducting Na0.50Bi0.49TiO3-δ (NB49T) even though the oxygen vacancies concentration in the pyrochlores is much higher. In dielectric measurements, relaxor behaviour is observed near room temperature. Variable temperature Neutron diffraction should enable to...
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