Abstract
New oxidized delafossite compounds of compositionInCuO2.5 and ScCuO2.5 are synthesized and their structures are characterized by means of x-ray andneutron powder diffraction. Oxygen intake is accompanied by a small increase ofthe unit cell, and a complex superstructure attributed to oxygen orderingappears. Average structure refinements show the presence of additionaloxygen close to the centres of Cu triangles, and an average copper valence of+2. The two compounds appear to be isostructural. Magnetic measurements show anon-linear thermal increase of the inverse magnetic susceptibility up to some maximum,soon followed by a minimum around 280 K.
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