Oxygen and cation ordered perovskite, Ba2Y2Mn4O11

Redox characteristics variations in the cation-ordered perovskite oxides BaLnMn2O5+δ(Ln = Y, Gd, Nd, and La) and Ca2Al1−xGaxMnO5+δ(0 ≤ x ≤ 1)

“…Both the a-and c-axis lengths are in agreement with those in the previous literature. 8,9,15,16 As expected, these values systematically increase with the increasing ionic radius of Ln 3+ in the order of Y, Gd, Nd, and La. 27 The oxygen content (5 + δ) values determined by iodometry are close to 5.00 for all the Ln-products (Table 1).…”

“…Details in the titration experiment are given elsewhere. 9 The grain morphology of each product was observed with scanning electron microscopy (SEM; JEOL JSM-6300F and JSM-6500F).…”

“…The intermediate δ ≈ 0.5 phase is known to crystallize in an orthorhombic structure which contains oxygen-vacancy ordering within the yttrium layer. 9,30 Meanwhile, the oxygen release behaviors are clearly different for Ln = Gd, Nd, and La. As demonstrated by a rep-Table 1 Summary of data for the BaLnMn 2 O 5+δ series: tetragonal aand c-axis lengths, excess oxygen content δ, and the onset temperature of oxygen intake in flowing O 2 gas.…”

“…We recently reported the remarkable oxygen intake/release capability of two manganese oxides, BaYMn 2 O 5+δ 5 and Ca 2 AlMnO 5+δ . 6 BaYMn 2 O 5+δ is categorized as an A-site ordered double-perovskite which contains smaller yttrium and larger barium ions in alternate layers, [7][8][9] as illustrated in Fig. 1.…”

An experimental and computational investigation of the oxygen storage properties of BaLnFe2O5+δ and BaLnCo2O5+δ (Ln = La, Y) perovskites

“…structure. 15,16 Recent computational results have conrmed that the released oxygen atoms originated from the yttrium plane, shedding light on the transport of these atoms through the crystal lattice. 17 Additionally, the stability of perovskite materials has been demonstrated by the cycling of BaYMn 2 O 5+d between O 2 and 5% H 2 /95% Ar over 100 times with no discernable change in efficiency.…”