While Vineyards work on transition state theory provides a foundation for how atomic vibrations describe the thermodynamics of ionic transport, the full lattice dynamical influence on the activation barrier and its frequency dependence are not well-understood. Understanding lattice dynamical influences on ionic transport is expected to illuminate nextgeneration design strategies for ionic conductors. Foundational to connecting lattice dynamics to ion transport is a phonon-based perspective of the activation barrier. It is understood that 𝐸 A represents a characteristic excitation energy that the mobile ion must attain in order for transport to occur. If discussing ionic motion via vibrations, then the excitations relevant for ionic transport are thermal atomic vibrations (Figure ), quantized as phonons whose energy is ℏ𝜔/phonon. Note that the angular frequency 𝜔 (rad/s) = 2𝜋𝜈 (where 𝜈 is the frequency in 1/s) will be used throughout this work, as is common in lattice dynamics, and will often be referred to simply as frequency.