YBaMn2O5: crystal and magnetic structure reinvestigation

Oxygen and cation ordered perovskite, Ba2Y2Mn4O11

“…Iodometric titration revealed a value of 0.97 (1) for the amount of excess oxygen, δ, in the O 2 -annealed sample. We may thus conclude in agreement with previous reports [17,20] that an essentially fully-oxygenated BaYMn 2 O 5+δ (with δ ≈ 1) phase has been obtained from the oxygen-depleted BaYMn 2 O 5+δ (with δ ≈ 0) sample by means of the low-temperature O 2 annealing.…”

“…This is in drastic contrast to the case of the BaRECo 2 O 5+δ double perovskites [13] for which continuous tuning of oxygen nonstoichiometry within 0 < δ < 0.7 is possible by selecting a proper temperature for the N 2 annealing in the temperature range of 300 -1000 o C, i.e. Among these, the first [9,20] and the last [17,22] are close to those reported in Ref. [22].…”

Oxygen and cation ordered perovskite, Ba2Y2Mn4O11

“…Once the A-site ordered, oxygen-deficient (here δ ≈ 0) double-perovskite framework of Among these, the first [9,20] and the last [17,22] are close to those reported in Ref. [22].…”

Enhanced oxygen intake/release kinetics of BaYMn2O5+.DELTA. fine powders prepared by a wet-chemical route

“…The lattice parameters were calculated to be a µ 0.554 nm and c µ 0.766 nm, in good agreement with those of BaYMn 2 O 5 (i.e., ¤ = 0) in the literature. 8 Meanwhile, TG analysis of the precursor revealed a significant weight loss (³40 wt %) upon heating in flowing N 2 , which is attributed to combustion (oxidation) of organic residues in the precursor. Such a combustion reaction of the residues may induce a reductive atmosphere in local environment, and thereby stabilize the BaYMn 2 O 5 phase during the heat treatment.…”