Tang et al. Through their comprehensive investigation, it was found that the optimal composition occurred at x = 0.7, showcasing the highest ionic conductivity. It was attributed to the structural frustration caused by the mismatched sizes of the anions, which flattened the energy landscape for anion rotation, resulting absence of an O-phase. These studies demonstrate the power of alloying as a strategy to design novel solid-state ion conductors with exceptional properties and potential applications in energy storage devices.