One such design principle arises from the observation that solid electrolytes with some form of hostframework disorder often have significantly higher ionic conductivities than related compounds with well-ordered host frameworks . Framework-disordered solid electrolytes typically exhibit one of two classes of disorder: occupational disorder, where two or more distinct species occupy the same crystallographic positions ; or orientational disorder, where molecular or polyatomic subunits within the host framework have different disordered orientations . Orientational disorder can be static, where each polyatomic subunit has a fixed average orientation over experimentally relevant timescales , or dynamic, where the polyatomic subunits rotate and reorient . In some solid electrolytes, this reorientational dynamics of the host framework is thought to couple to the diffusive dynamics of the mobile ion species, giving rise to a so-called "paddlewheel" effect .