Figure shows calculated lithium vacancy and lithium interstitial concentrations and corresponding ionic conductivities (via eq. ( )) for Li 3 OCl synthesised under Li-poor and Li-rich conditions, as a function of supervalent and subvalent effective dopant concentrations. To illustrate the effect of cooling from synthesis conditions to room temperature on lithium defect concentrations and on the ionic conductivity, we show data calculated for full equilibration under synthesis conditions (T = 663 K; dashed lines) and for partial re-equilibration at room temperature (T * = 273 K; solid lines).