Solid State Ionics, Vol.93, No.3-4, 329-334, 1997
Structural Characterization and Electronic-Properties of A-Substituted LaNi(0.8)Ma(0.2)O(3) (A=ca, Sr, M=te, W) Perovskites
The synthesis, structural characterization and electronic properties of the A(1-x)La(x)Ni(0.8)M(0.2)O(3) (A = Ca, Sr; M = Te, W) perovskite-like system are reported. These compounds can be regarded as being derived from LaNiO3 by partial substitution in both the A and B sublattices of the perovskite structure : Ni3+ is substituted by M(6+) cations and La3+ cations by divalent A ones. Orthorhombic symmetry (S.G. Pbnm) is found, from X-ray diffraction data, for all the title phases. Electrical resistivity measurements show semiconductor behavior in all cases (E(a) < 0.2 eV). Ferromagnetic interactions with Curie temperatures ranging between 180 and 290 K are dejected from susceptibility measurements.