The Young's, shear and bulk moduli of dense (> 95%) Gd-doped ceria (Ce1-xGdxO2-x/2) ceramics were determined as a function of Gd content using the ultrasonic pulse-echo method and corrected for porosity according to both static and dynamic models. With increasing defect concentration (0-20 mol% Gd), the Young's and shear moduli decrease linearly by 10% while for 29 mol%, the values lie above the linear fit; the bulk modulus decreases linearly within the complete range. We conclude that structural changes, induced by oxygen vacancy ordering for x > 0.2, may influence the uniaxial and shear moduli, leaving the bulk modulus unaffected.
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- Elastic properties
- Gd-doped ceria
- Sound velocity