Abstract
The elastic modulus of fluorite-structured pure ceria, gadolinium doped ceria (GDC) and yttria stabilized zirconia (YSZ) with different levels of oxygen vacancy concentration were measured by the nanoindentation technique. The samples were heat treated at 800 °C under an oxygen partial pressure in the range of 0.21 to 10 − 25 atm for 15 h until equilibrium was reached at a sufficient depth. The defect concentrations were conserved to room temperature by fast cooling. The results reveal that the elastic modulus of both pure ceria and GDC decreases drastically in samples heat treated at very low partial pressures of oxygen. However, the elastic modulus change for YSZ, within the studied range, is insignificant. An analysis of the experimental results suggests that an increase in the point defect content weakens the attractive forces between atoms in fluorite-structured oxides.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
