Effects of Ca Substitution in Single-Phase Sr 1-x Ca x Ti 0.8 Fe 0.2 O 3-ẟ Oxygen Transport Membranes and in Dual-Phase Sr 1-x Ca x Ti 0.8 Fe 0.2 O 3-ẟ -Ce 0.8 Gd 0.2 O 2 Membranes. - Nigroni, Veronica; Tang, Yuning; Baumann, Stefan; Sebold, Doris; Malgrati, Enrico; Fedeli, Paolo (Membranes, 2025)