Abstract
We prepared La0.8Sr0.2Ga0.8Mg0.2O3−δ (LSGM) and La0.8Sr0.2Ga0.8Mg0.115Co0.085O3−δ (LSGMC) and studied their oxygen nonstoichiometries with a microvalance, and crystal structures and conduction paths of oxide ions using a neutron source. From Rietveld analyses, it was indicated that these samples had a single phase of an orthorhombic structure represented as Pnma at 298∼680 K. It was also suggested that oxygen content in LSGMC decreased with increasing temperature and decreasing oxygen partial pressure although that in LSGM was almost independent of them. Such oxygen content behaviors were also demonstrated by nonstoichiometry measurements using a microvalance. Nuclear densities calculated based on MEM technique suggested faster migration of oxide ions in LSGMC than LSGM and the different conduction paths between them.
