Redetermination of the Structure of La₂Cu₂O₅ by Neutron Powder Diffraction

Dicopper(II) dilanthanum pentaoxide, La₂Cu₂O₅, has been prepared using a high-pressure technique. Its structure at 296 and 10 K was analyzed by Rietveld refinements of neutron powder diffraction data. The structure of La₂Cu₂O₅ comprises CuO₅ square pyramids connected to each other three dimensionally by corner sharing and ten-coordinate La³⁺ ions occupying positions next to oxygen vacancies which form tunnels along the c axis.

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