Dimensionality: Three-dimensional (3D) diffusion pathways are crucial for achieving high σ, as they provide a lower possibility of blocking the ion conduction path. Structures that possess 3D diffusion pathways often exhibit a correlation with high σ, while lower dimensionalities often result in reduced ionic transport due to the potential obstruction of diffusion channels by defects . Even though the conductivity eq. 8 tells a different story, as the dimension term is in the denominator. Optimal bottleneck radius: Ionic conductors with intrinsically low activation barriers are highly desirable in the field of materials science. These materials exhibit the ability to facilitate ionic jumps through polyhedral faces, resulting in a change in the coordination environment surrounding the moving ion along its diffusion pathway.