Abstract
A series of layered compounds InGaZn1-xCuxO4 (x = 0−1) were prepared by sol-gel method for the first time and characterized by powder X-ray diffraction (PXRD). All these solid solutions adopt LnFe2O4-type structure and crystallize in R-3m. With an increase of Cu2+-content in InGaZn1-xCuxO4, the lattice showed an anisotropic change with a linear shrinkage and expansion of c- and a-axis, respectively. Rietveld refinements against PXRD data revealed that Cu2+/Zn2+ and In3+ cations reside in the (Cu/Zn)O5-based trigonal bipyramids (TBP) double layers and octahedral layers, respectively. And the anisotropic structure change stems from the dramatic contraction of M-Oapical bonds and slight expansion of M-Obasal bonds for the (Cu/Zn)O5 trigonal bipyramids, due to the Jahn-Teller active Cu2+ (d9) and smaller cationic size of Cu2+ (r = 0.65 Å) compared to Zn2+ (r = 0.68 Å).
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