“…Another promising method to optimize the thermomechanical properties of mixed-conducting ceramics is the fabrication of composites. For instance, additions of alumina to SrCo 0.8 Fe 0.2 O 3 − δ and yttria-stabilized zirconia (YSZ) to SrCo 0.4 Fe 0.6 O 3 − δ were reported to enhance dimensional integrity and mechanical strength, respectively [13,14]. An improved thermal-shock resistance and fracture toughness, and reduced thermal expansion were observed for (SrFeO 3 − δ ) 1 − x (SrAl 2 O 4 ) x and (SrCo 0.8 Fe 0.2 O 3 − δ ) 1 − x (SrAl 2 O 4 ) x composite series [15,16].…”