Crystal structure refinement of the layered copper-titanium perovskites Ln{sub 2}Ba{sub 2}Cu{sub 2}Ti{sub 2}O{sub 11} (Ln = La, Nd) from neutron powder diffraction data
- Institut de Ciencia de Materials de Barcelona (Spain)
Neutron powder diffraction data of the oxides Ln{sub 2}Ba{sub 2}Cu{sub 2}Ti{sub 2}O{sub 11} (Ln = La, Nd) are presented and analyzed by means of Rietveld profile refinements. These data confirm the existence, in both cases, of a tetragonal superstructure based on a quadrupole perovskite (a{sub p} x a{sub p} x 4a{sub p}). Whereas the Nd derivative presents complete long range order of Cu/Ti, Ln/Ba, and oxygen vacancies, in the lanthanum derivative this order is only partial. 9 refs., 2 figs., 4 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 98757
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 11 Vol. 6; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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