Abstract
We report a study of the evolution of the structure of the delafossite-derived compounds YCuO 2+ δ as a function of oxygen stoichiometry. The structural details of the oxygenated material YCuO 2.5 were examined by means of high-resolution neutron powder diffraction. We confirmed that YCuO 2.5 adopts an orthorhombic superstructure ( a = 3 a H , b = c H , c = 2 a H ) in which the anions are located at the center of corner-sharing triangles to form undulating chains of Cu 2+ ( s = 1 / 2 ), running along a-axis direction.
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