Impact of La doping on the crystalline phase and mixed ionic-electronic conductivities of Ba0.5−xLa0.5+xFeO3−δ (0≤x≤0.3) solid solution
Article
Alam, MS, Kagomiya, I, Kakimoto, KI. (2023). Impact of La doping on the crystalline phase and mixed ionic-electronic conductivities of Ba0.5−xLa0.5+xFeO3−δ (0≤x≤0.3) solid solution
. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, 34(5), 10.1007/s10854-022-09729-x
Alam, MS, Kagomiya, I, Kakimoto, KI. (2023). Impact of La doping on the crystalline phase and mixed ionic-electronic conductivities of Ba0.5−xLa0.5+xFeO3−δ (0≤x≤0.3) solid solution
. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, 34(5), 10.1007/s10854-022-09729-x
This study discusses the preparation of lanthanum-doped barium ferrite following the solution combustion procedure. The solid solution of A-site elements in Ba0.5−xLa0.5+xFeO3−δ (0 ≤ x ≤ 0.3) has been explored. The synchrotron x-ray powder diffraction data and relevant Rietveld refinement indicate that the crystallographic configuration transformed from cubic to orthorhombic for x > 0.1. Because La-doping decreases structural symmetry on the crystal lattice resulting in a reformed structural phase. A dense microstructure was obtained for all the samples, where optimum grain growth was observed for an equal amount of Ba and La in the A-site. The highest oxygen deficiency of 50 mol% La-doped sample was confirmed by Thermogravimetric analysis. The highest total electrical conductivity of 226.2 S/cm at 450 °C and the highest oxygen permeability of 248 nmol/cm2/s at 950 °C exhibited by 50 mol% La-doped sample indicating potentiality as an air-electrode of solid oxide fuel cells.
