Powder X-Ray and IR Studies of the New Oxyselenides MOCuSe (M = Bi, Gd, Dy)

Autor: Berdonosov, P. S., Kusainova, A. M., Kholodkovskaya, L. N., Dolgikh, V. A., Akselrud, L. G., Popovkin, B. A.
Zdroj: Journal of Solid State Chemistry; August 1995, Vol. 118 Issue: 1 p74-77, 4p
Abstrakt: The group of oxyselenides with the formula (MO)(CuSe) (M = Gd, Dy, and Ho) has been prepared by reacting M2O3, Cu, M, and Se at 750°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), c = 8.723(5) Å; DyOCuSe, a = 3.8854(2), c = 8.701(4) Å; HoOCuSe, a = 3.866(2), c = 8.685(7) Å. Crystal structures are built up of [M2O2] fluorite-like layers (M = Gd, Dy), normal to the Z-axis, alternating with [Cu2Se2] layers formed by slightly distorted edge-sharing CuSe4 tetrahedra. The structures were compared with those of other similar layered compounds. Copyright 1995, 1999 Academic Press
Databáze: Supplemental Index
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