Abstract
EXAFS results on the three solid phases of CuI support an excluded volume model for the CuI pair correlation function. The Cu ion density in the superionic α-phase peaks at the tetrahedral locations but is also substantial in the octahedral voids. The indicated Cu ion conduction path is in 〈111〉 directions through the faces shared by the tetrahedra and octahedra in the FCC iodine lattice with an energy barrier of roughly 0.16 eV in the superionic phase.
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