CYb, Eu)Fe204 crystallizes in space group R]m with hexagonal parameters a=b=3.486 and c= 24.92 A. The crystal structure has been determined by the heavy-atom method and Fourier synthesis.Least-squares refinement with anisotropic temperature factors yielded a final R value of 0.059. The rare-earth metals are octahedrally coordinated by six oxygen atoms and the iron atoms by five oxygen atoms at the apices of a trigonal bipyramid.
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