This study investigates the stabilization of the orthorhombic phase in Ce0.5Hf0.5O2 ceramics via low-pressure, high-temperature processing. Its electrostrictive performance was also evaluated. Cerium oxide (CeO2) and hafnium oxide (HfO2) were homogenized using a tubular mixer and compacted using a uniaxial press machine. The samples were sintered at 1500 C and 1650 C. Structural analysis using X-ray diffraction revealed the emergence of the orthorhombic phase only at 1650 C, along with improved crystallinity and lattice stability. Electrical characterization showed enhanced conductivity and higher permittivity at 1650 C, indicating improved grain connectivity and defect structure. Electromechanical measurements demonstrated a clear quadratic strain-electric field relationship (S proportional to E^2), confirming electrostrictive behavior. A giant electrostrictive response was observed with M33 approximately 1.3 x 10^-17 m^2/V^2 at 1650 C. A frequency-independent plateau was observed between 10 Hz and 1 kHz, indicating a fast and stable electromechanical mechanism. The results highlight the role of defect-mediated coupling and thermal processing in enhancing electrostrictive performance, positioning Ce0.5Hf0.5O2 ceramics as promising lead-free alternatives for advanced electromechanical applications.
Comissão Organizadora
Pedro Alves da Silva Autreto
Comissão Científica
Ferramenta completa de submissão, avaliação e publicação de anais para eventos científicos.
