Year-end Sale % OFF 
Abstract
The high temperature ionic (σi) and n-type electronic conductivity (σn) of 7.5 mol% MgO-doped partially stabilized ZrO2 (7.5MgPSZ) were determined using 4 probe total conductivity (in air, 800–1600 °C), and oxygen concentration cell open circuit voltage measurements (1200–1600 °C). The latter involved two distinct cell configurations (Al or Cr-based electrodes versus air). The σn values of 4.78 × 10−4 S.cm−1 at 1600 °C (extrapolated to pO2 = 1 atm) and activation energy of 424.0 kJ.mol−1 are hereby reported for the first time. The observed ionic conductivity of 0.60 S.cm−1 at 1600 °C and activation enthalpy of 119.5 kJ.mol−1 for the 1400–1600 °C temperature range are both within upper ranges reported for other PSZ materials. This high activation enthalpy suggests a strong defect association between oxide-ion vacancies and acceptor dopant, exceeding typical values observed with trivalent dopants. The reasons for wide literature data ranges on ionic transport are discussed taking into consideration the variable phase content, phase composition, and potential non-equilibrium conditions observed in experiments. The specific case of hysteresis in conductivity versus temperature curves is analyzed in detail. Complementary structural and microstructural characterization, besides thermal expansion behavior, are used to support the analysis of electrochemical performance.
Published Version
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.
