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• W2620470278 abstract "Cubic, fluorite-structured solid solutions Zr1–xYxO2–x/2 (YSZ; x = 0.4–0.7) were prepared by sol–gel synthesis. Impedance measurements on pellets of 85% approximate density sintered at 1300 °C for 24 h showed strong evidence of oxide ion conduction with an inclined Warburg spike at low frequencies and capacitance values of ∼10–6 F cm–1 at 40 Hz. Arrhenius plots of total pellet conductivities were linear with activation energies of 1.4–1.56 eV. The conductivity decreased with x and was 2–4 orders of magnitude lower than that with optimized YSZ, x = 0.08. When the atmosphere was changed from N2 to O2 during impedance measurements, two reversible effects were seen: the Warburg spike contracted greatly, and the sample resistance decreased. These effects were more noticeable at higher x and are attributed to the introduction of p-type electronic conduction, in parallel with the preexisting oxide ion conduction. A similar reversible result was observed upon application of a direct-current (dc) bias during impedance measurements. When either pO2 is increased or a dc bias is applied, hole creation is believed to arise by the ionization of underbonded oxide ions situated near the Y3+ dopant ions. The ionized electrons are trapped at surface oxygen species, and the holes that are left on oxygen are responsible for p-type conduction. The electrolytic domain of x = 0.4–0.7 extends up to approximately 10–2 atm of O2 before p-type conduction is observed. The upper pO2 limit of the electrolytic domain of x = 0.08 is not known but is likely to be close to or slightly above 1 atm of O2." @default.
• W2620470278 created "2017-06-05" @default.
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• W2620470278 date "2017-05-26" @default.
• W2620470278 modified "2023-09-29" @default.
• W2620470278 title "Atmosphere- and Voltage-Dependent Electronic Conductivity of Oxide-Ion-Conducting Zr_1–<i>x</i>Y_<i>x</i>O_{2–<i>x</i>/2} Ceramics" @default.
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• W2620470278 doi "https://doi.org/10.1021/acs.inorgchem.7b00673" @default.
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