Abstract
This study examined the local structural properties of CuI at low temperatures of10–300 K by x-ray diffraction (XRD) and extended x-ray absorption fine structure(EXAFS) measurements at the Cu K edge. The XRD data were refined usingtwo models, split (distorted zinc-blende structure) and non-split (zinc-blendestructure), using a conventional Rietveld refinement combined with a maximumentropy method (MEM). MEM/Rietveld analyses showed that both the split andnon-split models could fit the data. EXAFS revealed the split model fit to be betterthan the non-split model. The split distance of Cu–I pairs was approximately0.03 Å at 15 K andincreased to 0.07 Å at 300 K. XRD and EXAFS combined together suggested that the CuI crystal was ina metastable state with a distorted zinc-blende structure at low temperatures.
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