2. Experimental details
A monolithic Al2O3 (average particle size, 0.5 μm) was used as a baseline material. YSZ (Good Fellow Cambrigde Limited) particles (average particle size, 1.5 μm) were added to an Al2O3 matrix with a ratio of 80 wt.% Al2O3/20 wt.% YSZ. MgO in average particle sizes of 80 nm (Strem Chemicals), 500 nm (Alfa Aesar) and 7000 nm (Alfa Aesar) were added to the Al2O3/YSZ respectively. The Al2O3/YSZ