Abstract
The tunability of the oxygen stoichiometry in the BaRE(Cu0.5Fe0.5)2O5+δ double-perovskite structure, stable with rare earth elements RE=Lu–Pr, was studied by both normal-pressure thermogravimetric oxidative (O2) and deoxidative (Ar) post-annealings and high-pressure heat treatments carried out in a cubic-anvil-type high-pressure apparatus. Under reducing conditions the BaRE(Cu0.5Fe0.5)2O5+δ double perovskite is obtained at δ≈0 irrespective of the size of the RE constituent. In the structures with RE=Pr and Nd the oxygen stoichiometry can be continuously varied by normal-pressure post-annealings up to δ≈0.24 and 0.35, respectively, whereas with a smaller rare earth ion, i.e., RE=Lu–Sm, the amount of excess oxygen raises from δ≈0 only upon high-pressure heat treatment.
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