Synthesis and characterisation of La4BaCu5013+d and La4BaCu5-xMxO13+d: M =Fe,Co, Ni, Zn

P. S. Anderson, C. A. Kirk, Janet Mabel Scott Skakle, A. R. West

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Abstract

La4BaCu5-xMxO13+d: M=Fe, Co, Ni, Zn were prepared by the solid-state route at 1000°C. Solid solution limits of x=1.0(1) [Fe], x=1.1(1) [Co], x=1.56(7) [Ni] and x=0.47(1) [Zn] were determined from XRD and EPMA results. Rietveld refinement of combined XRD/neutron powder diffraction data was carried out on undoped La4BaCu5O13+d and x=1 for M=Fe, Co, Ni. For La4BaCu5O13+d, which is an oxygen-deficient perovskite, the presence of square planar CuO4 groups, disordered over the Cu(2) sites with CuO5 square pyramids, is indicated, together with, for d<0, either square planar CuO4 or square pyramidal CuO5 and octahedral CuO6 groups disordered over the Cu(1) sites. For M=Fe, Ni, there was preferential substitution onto the one-fold octahedral site; for M=Co, substitution took place on both the one-fold octahedral and four-fold square pyramidal sites.

Original languageEnglish
Pages (from-to)1-8
Number of pages7
JournalJournal of Solid State Chemistry
Volume170
Issue number1
Early online date24 Dec 2002
DOIs
Publication statusPublished - Jan 2003

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