Structural characterization of mixed conducting perovskites La(Ga,M)O3-delta (M = Mn, Fe, Co, Ni)

abstract

Comparative analysis of the structure refinement results of perovskite-like LaGa0.5M0.5O3-delta (M = Mn, Fe,Co, Ni) and data on other LaGaO3-based phases, heavily doped with transition metal cations, shows that on doping the structural changes in these oxides follow common trends for,the perovskite-type systems. The maximum ionic conductivity, observed in various perovskites when the tolerance factor values are approximately 0.96-0.97, was found to correlate with the transition from orthorhombic to rhombohedral structure and maximum lattice distortion. The perovskite unit cell distortion near the orthorhombic-rhombohedral phase boundary may hence, play a positive role in the ionic transport processes. (C) 2002 Elsevier Science Ltd. All rights reserved.

keywords

MORPHOTROPIC PHASE-BOUNDARY; OXIDE IONIC CONDUCTOR; OXYGEN PERMEABILITY; MAGNETIC CHARACTERIZATION; SOLID-SOLUTIONS; DOPED LAGAO3; CR; DIFFRACTION; TRANSPORT; SYSTEM

subject category

Materials Science

authors

Vyshatko, NP; Kharton, V; Shaula, AL; Naumovich, EN; Marques, FMB

our authors

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