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DOI: 10.1039/A605206A (Paper) Reference Section for: J. Mater. Chem., 1997, 7, 801-806

Structural characterization and properties of the perovskite (NaLa)(MW)O6(M=Co, Ni): two new members in the group–subgroup relations for the perovskite-type structures

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M. Angeles Arillo, Julio Gómez, María L. López, Carlos Pico and M. Luisa Veiga

Abstract

The crystal structures of (NaLa)(MW)O6 (M=Co, Ni) suggest that both adopt a monoclinic perovskite-type structure [M=Co: a=5.546(3), b=5.545(4), c=7.903(6) Å, β=89.99(3)°; M=Ni: a=5.517(5), b=5.518(7), c=7.862(2) Å, β=90.02(4)°; space group P21 /m]. The structure consists of an ordered arrangement of MO6 and WO6 octahedra (in B sites) which share corners and alternate planes of La and Na cations along the c-axis (in A sites). This structure is analysed on the basis of a general group–subgroup symmetry relationship for some perovskites that were previously described, and the electronic and magnetic properties of both compounds are discussed.

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