Abstract
Dicopper(II) dilanthanum pentaoxide, La 2 Cu 2 O 5 , M r =484.90, orthorhombic, Pbam. At T=300 K: a=5.5490 (1), b=10.4774 (2), c=3.8796 (1) A, V=225.557 (8) A 3 , Z=2, D x =7.139 g cm -3 , λ=1.200 A. Final R I =6.20, R p = 14.6 and R wp =20.61%, 124 independent reflections observed. The structure has been refined from high resolution synchrotron X-ray powder diffraction data using the Rietveld method. It is of the oxygen defect perovskite type and is composed entirely of corner-shared CuO 5 square pyramids, which share oxygen vacancies forming vacancy tunnels along the c axis. The La atoms reside at a perovskite-like A-site and are tenfold coordinated by oxygen
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