Room temperature elastic properties of gadolinia-doped ceria as a function of porosity

Gadolinia doped ceria (GDC) is commonly used in chemical reactors, gas sensors, gas separation membranes, and solid oxide fuel cells (SOFCs). In the present study, the room temperature elastic properties of GDC10 (Ce0.9Gd0.1O1.95) were measured as a wide function of porosity for the first time. GDC10 specimens with volume fraction porosities ranging from 0.07 to 0.60 were produced by hard die pressing and sintering GDC10 powders in air at temperatures ranging from 825 to 1475 °C. The room temperature Youngʹs modulus, shear modulus, bulk modulus and Poissonʹs ratio were measured using resonant ultrasound spectroscopy. The elastic moduli decreased exponentially with increasing porosity.