New brownmillerite-based oxide ion conductors:Direct observation of multi-scale oxide ion dynamics
Oxide ion conductors are key components in a number of technologically important applications, including oxygen sensors and pumps, membranes for oxygen separation and solid oxide fuel cells. Our collaborative research programme on the development of new oxide ion conductors, based in part on using neutron scattering methods coupled with computational modelling, has resulted in new insight into the relationships between structure, dynamics and properties in some of the leading solid electrolytes based on the fluorite and apatite structure types. Crucially, we have been able to demonstrate the importance of variable coordination environments of cations and the rotational freedom of these coordination polyhedra as key structural motifs which facilitate high oxide ion mobility at relatively low temperatures. We have recently prepared new excellent oxide ion conductors based on the brownmillerite structure. These are new compositions based on Sr2ScGaO5, which itself is a modest oxide ion conductor. Here we request 5 days on IN16b and 5 days on IN6, to carry out the first variable-temperature inelastic/quasi-elastic neutron scattering experiments on the new oxide ion conductors.
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EVANS Ivana; BERROD Quentin; EVANS John; Bernhard Frick; FULLER Chloe; JOHNSON Mark Robert and ZANOTTI Jean-Marc. (2018). New brownmillerite-based oxide ion conductors:Direct observation of multi-scale oxide ion dynamics. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-03-171
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