This change in the coordination environment creates a structural "bottleneck" for the diffusion process. It has been established that this BN is closely linked to the activation barriers and conductivities observed in ionic conductors . Structural modifications arising from substitutions and strains can significantly impact the enthalpy change (∆H m ) by altering the interaction between charges , the migration mechanism , frustrated energy landscapes , and the geometry of conduction pathways , among other factors. Of particular importance are materials possessing a percolating, three-dimensionally extended network composed of connected polyhedra with similar coordination environments. This structural characteristic can be achieved, for instance, by exclusively incorporating face-sharing polyhedra of the mobile species (refer to Fig. , ). Such an arrangement minimizes the change in the coordination environment and naturally results in low activation barriers. Framework Modification: Aliovalent substitutions not only alter the lattice size but also the charge carrier density . Since most superionic conductors feature numerous empty or partially filled crystallographic sites , these substitutions have an impact on ionic conductivity. These approaches are primarily concerned with the static crystallographic aspects, focusing on the actual crystallographic structure and stoichiometries. The fourth strategy involves utilizing a softer and more polarizable anion sublattice. The idea behind this approach is that modifying bonding interactions, such as reducing the degree of bond polarity, weakens the bonding between the mobile cations and surrounding anions . Consequently, the lowered activation barrier facilitates the departure of a cation from a stably coordinated lattice site, as less energy is required. This decrease in bond strength, or the vibrational amplitudes around a saddle point, results in a flatter energy landscape for the ion jump .