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Reported structures in the CuI–AgI–BiI3 phase space: binaries CuI, AgI, and BiI3;15−17 ternaries Ag3BiI6, Ag2BiI5, AgBiI4, AgBi2I7, Ag2Bi3I11, CuBiI4, and Cu2BiI5;1,18−22 and quaternary Cu2AgBiI6.2 We have also added the compound we report here, CuAgBiI5. As discussed in the text, all these compounds consist of a close-packed iodide sublattice with varying arrangements of the cations filling the octahedral and tetrahedral interstitial sites to form the structures shown.
