Synthesis, structure and oxygen nonstoichiometry of La0.4Sr0.6Co1−Fe O3−

On the link between bulk and surface properties of mixed ion electron conducting materials Ln0.5Sr0.5Co0.8Fe0.2O3−δ(Ln = La, Pr, Nd)

“…8. The measured stoichiometry for La 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3Àd was in between that previously reported for La 0.4 Sr 0.6 Co 0.8 Fe 0.2 O 3Àd and La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3Àd , [48][49][50][51] as may be anticipated due to trends in charge compensation upon increased doping of Sr 2+ onto the A-site.…”

Effect of A-/B-site Doping on Oxygen Non-Stoichiometry, Structure characteristics, and O2 Releasing Behavior of La1−xCaxCo1−yFeyO3−δ Perovskites

“…Yang et al [15] used an empirical formula to describe the relationship between oxygen non-stoichiometry and the oxygen partial pressure. Cherepanov [16] found that in the case of constant temperature and oxygen partial pressure, oxygen non-stoichiometry of La 0.4 Sr 0.6 Co 1−y Fe y O 3−δ (y = 0.2 and 0.4) increased by increasing Co-doping. When the A-site was doped with lower valence metal ions (in order to maintain charge neutrality and then induce the oxidation of Fe 3+ and Co 3+ ), this led to the formation of oxygen vacancies.…”

Crystal structure and magnetic properties of high-oxygen pressure annealed Sr1−xLaxCo0.5Fe0.5O3−δ (0⩽x⩽0.5)

“…The level of the oxygen nonstoichiometry at high temperatures in the Sr 1Àx La x Co 1Ày Fe y O 3Àd system is determined by both, the Sr/La and Co/Fe ratios and can exceed d ¼ 0.3. It increases with both strontium and cobalt content [5,[21][22][23][24] as explained by the change of the average oxidation state of cobalt and/or iron 4-x-2d with the La 3+ /Sr 2+ ratio and the difficulty of obtaining Co 4+ . This trend was observed for the mixed compositions, SrCo 1Àx Fe x O 3 prepared by high-temperature reaction [16,25] as well as by a standard ceramic method using high oxygen pressure for oxidation.…”