Oxide ions diffusion mechanism in melilite-type solid electrolytes
It has been demonstrated that the 2D extended corner-sharing tetrahedral network of the melilite-type La1+xSr1−xGa3O7+0.5x can both accommodate excess oxide anions and sustain their mobility. The composition La1.54Sr0.46Ga3O7.27 shows the highest oxide ion conductivity of ~0.1 S/cm at 800 C. This represents an improvement of 4 orders of magnitude compared to LaSrGa3O7. In this proposal, we request IN16b and IN6 to carry out variable-temperature quasi-elastic and inelastic neutron scattering experiments on La1.54Sr0.46Ga3O7.27, La1.40Sr0.60Ga3O7.20 and LaSr0.60Bi0.40Ga3O7.20 oxide ion conductors. This will be the first direct observation of the O2- dynamics in melilite-type materials, which will be analysed in conjunction with the first ab initio molecular dynamics (AIMD) simulations on these systems. This will enable us to relate the differences in oxygen ion conductivities to the interstitial oxygen excess (La1.54Sr0.46Ga3O7.27 and La1.40Sr0.60Ga3O7.20) and Bi doping (La1.40Sr0.60Ga3O7.20 and LaSr0.60Bi0.40Ga3O7.20) in terms of activation energy, residence time, favourable conduction paths and possible lone pair blocking effect for the conduction in the Bi-doped sample.
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:
EVANS Ivana; APPEL Markus; BERROD Quentin; GONZALEZ Miguel Angel and SCHWAIGHOFER Bettina. (2020). Oxide ions diffusion mechanism in melilite-type solid electrolytes. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-03-189
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.