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DOI: 10.1039/A803015D (Paper) Reference Section for: J. Mater. Chem., 1998, 8, 2487-2491

Structural investigations of new copper fluorides NaRECu2F8 (RE3+=Sm3+, Eu3+, Gd3+, Y3+, Er3+, Yb3+)

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C. De Nadaï, A. Demourgues, L. Lozano, P. Gravereau and J. Grannec

Abstract

A series of copper(II) and rare earth fluorides has been prepared. The crystal structure of NaGdCu2F8 has been solved from single crystal data and refined to conventional R=0.028 (wR=0.048) for 585 independent reflections. The symmetry is tetragonal (space group I422) with a=5.407(1) and c=10.382(1) Å (Z=2). A Rietveld analysis of NaYCu2F8 and refinements of the powder X-ray diffraction data for the other compounds of the series confirmed the I422 space group. The structure consists of layers of CuF4 square-planes perpendicular to the c-axis, interleaved alternatively by Na+ or RE3+ cations located in antiprisms.

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