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Issue 5, 2002
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Abstract

The composition LaNi0.5Cu0.5O3−δ has been prepared by heat treating a polyacrylamide xerogel in flowing O2. A perovskite type structure starts to crystallise at 700 °C and is achieved at 1000 °C. TGA data point to the formation of a rather strongly oxidised compound (δ ≤ 0.09). As the solid state reaction of a mixture of La2O3/NiO/CuO powder oxides never yields a perovskite, the part of the sol–gel route in this synthesis proves to be crucial. On the basis of X-ray and neutron diffraction results, the existence of a cupronickelate having a rhombohedral perovskite type structure is proved. Rather unexpectedly, an electron diffraction study of the as-prepared composition at 1000 °C reveals the presence of two sets of perovskite type cupronickelate microcrystals: a copper rich one with a fixed composition 67% Cu and a nickel rich one with a small range of compositions 59 ≤ Ni% ≤ 67. The latter microcrystals feature the rhombohedral LaNiO3 perovskite whereas the former one, due to the partial presence of Cu(II), frequently shows an orthorhombic [2ap√2 × 2ap√2 × ap] supercell. Thus, the composition LaNi0.5Cu0.5O3−δ. has to be understood in terms of a nanoscale segregated pseudo solid solution formed of two lanthanum cupronickelates, enriched in copper and nickel, respectively.

Graphical abstract: Sol–gel synthesis and structural characterisation of the perovskite type pseudo solid solution LaNi0.5Cu0.5O3

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Publication details

The article was received on 02 Jan 2002, accepted on 28 Jan 2002 and first published on 12 Mar 2002


Article type: Paper
DOI: 10.1039/B200034M
J. Mater. Chem., 2002,12, 1370-1373

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    Sol–gel synthesis and structural characterisation of the perovskite type pseudo solid solution LaNi0.5Cu0.5O3

    P. Odier, M. Municken, M. Crespin, F. Dubois, P. Mouron and J. Choisnet, J. Mater. Chem., 2002, 12, 1370
    DOI: 10.1039/B200034M

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