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Fast ionic conductors have considerable potential to enable technological development for energy storage and conversion. Hydride (H − ) ions are a unique species because of their natural abundance, light mass, and large polarizability. Herein, we investigate characteristic H −  conduction, i.e., fast ionic conduction controlled by a pre-exponential factor. Oxygen-doped LaH 3  (LaH 3  −2 x  O  x  ) has an optimum ionic conductivity of 2.6 × 10 −2  S cm −1 , which to the best of our knowledge is the highest H −  conductivity reported to date at intermediate temperatures. With increasing oxygen content, the relatively high activation energy remains unchanged, whereas the pre-exponential factor decreases dramatically. This extraordinarily large pre-exponential factor is explained by introducing temperature-dependent enthalpy, derived from H −  trapped by lanthanum ions bonded to oxygen ions. Consequently, light mass and large polarizability of H − , and the framework comprising densely packed H −  in LaH 3  −  2 x  O  x   are crucial factors that impose significant temperature dependence on the potential energy and implement characteristic fast H −  conduction.

Characteristic fast H− ion conduction in oxygen-substituted lanthanum hydride