Year: 2024
Type: article
Abstract: Oxygen-deficient cerium oxide ceramics exhibit an anomalously high electromechanical response called giant electrostriction.This feature has been linked to the polarization and reorganization of ionic defects, i.e., V ⋅⋅ O , under an electric field.However, the exact mechanism and how it is related to intrinsic/extrinsic characteristics of doped ceria remains unclear.The present work investigates how alkaline-earth dopants with different defect-dopant interactions affect the overall electrochemical properties and defect chemistry and, ultimately, how these features impact the final electromechanical properties.We found higher dopant-defect associations attenuate the low-frequency relaxation of the electrostrictive coefficient.The defect chemistry is shown to be the main factor controlling the final electromechanical properties rather than defect concentration.All compositions show a similar electrostrictive response at high frequencies, indicating a common underlying mechanism.All samples showed a high electrostrictive coefficient (up to 3⋅10 -17 m 2 /V 2 ) and pseudo-piezoelectric response (32 pm/V).Extensive and detailed structural and electrochemical characteriza-
Source: Acta Materialia
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,210
Award: G29316538
OpenAlex ID: W4402205307