Ba7MoNb4O20: Local structure analysis of a novel hexagonal electrolyte

Solid-state electrolyte materials are crucial for applications involving electrochemical conversion and storage, as these devices become increasingly important in the transition to a low carbon economy. We have recently discovered a new ionic conductor, Ba7MoNb4O20, which delivers exceptional levels of oxide ion conductivity at low temperatures and in reducing atmospheres. The conductivity response in wet/dry environments also indicates a degree of proton transport. To date, only average structure modelling has been carried out, therefore, it is imperative to resolve the local structure of Ba7MoNb4O20 as several key aspects remain unclear. I propose neutron total scattering experiments on dry and deuterated samples of Ba7MoNb4O20 in order to model the local structure at various temperatures and to explore the complex local disorder in this novel electrolyte material.