Structural characterization of R{sub 2}Cu{sub 2}O{sub 5} (R = Yb, Tm, Er, Y, and Ho) oxides by neutron diffraction
Journal Article
·
· Journal of Solid State Chemistry
- Institut de Ciencia de Materials de Barcelona, Bellaterra (Spain)
- Laboratoire Leon Brillouin, Gif sur Yvette (France)
The structural features of the R{sub 2}Cu{sub 2}O{sub 5} family of compounds have been studied by high-resolution neutron powder diffraction. This isostructural series belongs to the noncentrosymmetric space group Pna2{sub 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 RO{sub 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{sub 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.
- OSTI ID:
- 75764
- Journal Information:
- Journal of Solid State Chemistry, Vol. 115, Issue 2; Other Information: PBD: Mar 1995
- Country of Publication:
- United States
- Language:
- English
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