Abstract
The structural features of the R 2 Cu 2O 5 family of compounds have been studied by high-resolution neutron powder diffraction. This isostructural series belongs to the noncentrosymmetric space group Pna2 1. A comparative study of the influence of the rare earth on the structural parameters is presented. In addition to the expected expansion of the R O 6 octahedra when the rare earth ionic radii are varied, the main modification of the structure corresponds to the elongation of the apical Cu-O distance in the CuO 5 pyramid. Conversely, the basal plane remains unchanged. A systematic variation of the structural stability is found depending on the size of the rare earth atom.
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