Structural ordering in new super-excess melilite oxide ion conductors
We propose to characterise the crystal structures of a new series of non-stoichiometric gallate melilite oxide ion conductors La1+xBa1-xGa3O7+x/2 with extremely high interstitial oxide ion concentrations x > 0.35 (so-called "super-excess" compositions). These are new materials with potential applications as solid oxide fuel cell electrolytes which we have synthesised for the first time by direct crystallisation of an under-cooled melt. Their ionic conduction properties are thought to be affected by complex, correlated ordering of interstitial oxide ions and La3+/Ba2+ cations that is composition- and temperature-dependent, but these relationships are poorly understood due to the narrow range of compositions that were previously accessible. We will use D2B to collect neutron powder diffraction data from a wide range of compositions and temperatures (0.3 < x < 0.9; and 25-800°C for x = 0.8) to map the onset of structural ordering on the interstitial oxide and La3+/Ba2+ sublattices by the Rietveld method, and correlate this with their measured conductivities to produce new chemical understanding of these materials.
The data is currently only available to download if you are a member of the proposal team.
The recommended format for citing this dataset in a research publication is in the following format:
PITCHER MICHAEL; ALLIX Mathieu and SAVVIN Stanislav. (2021). Structural ordering in new super-excess melilite oxide ion conductors. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-757
This data is not yet public
This data is not yet public
ILL has partnered with DataCite as the registration agency
for data persistent identifiers.