Systems that exhibit a continuous framework, with electrolyte and electrode regions differentiated by small differences in composition are being developed for use in all solid state lithium ion conducting batteries. We have developed a new lithium germanium molybdate solid solution as a possible host for reversible intercalation of lithium for potential use as an electrode material. The solid solution exhibits the LISICON structure well known for its fast lithium ion conductivity. The present proposal seeks to use reverse Monte Carlo modelling of total neutron scattering data to derive models for defect clustering in these systems. Our preliminary room temperature investigation of a related LISICON system has already challenged our understanding of the defect structure in these systems.