Crystalline disorder in complex oxides can have a pronounced effect on mass transport, but the role of disorder within the complex landscape of material and microstructural defects is not uniquely understood. Dopants or substitutions are commonly used to introduce disorder, but this inherently convolutes chemical composition and structure. In this work, we use irradiation damage not to study the fundamental damage response, but rather to induce and control the extent of disorder in oxide materials of a single composition in order to explore the relationship between intrinsic disorder and oxygen ion conduction. Prior work showed that the transition from ordered pyrochlore to disordered fluorite in Gd₂Ti₂O₇ (GTO) with increasing fluence of He irradiation was accompanied by an orders-of-magnitude increase in conductivity. This work examines the role of grain/grain-boundary microstructure on irradiation-induced damage and its corresponding impact on conductivity.