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The group of oxyselenides with the formula (MO)(CuSe) (M = Gd, Dy, and Ho) has been prepared by reacting M 2 O 3 , Cu, M, and Se at 750 o C for 240 hr. All compounds were characterized by IR-spectra analysis. Powder diffraction structure analysis was made for GdOCuSe and DyOCuSe (Rietveld profile analysis) in P4/nmm symmetry. Crystal data are as follows: GdOCuSe, a = 3.9186(2),...