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• W2154197211 abstract "The effect of doping potassium on the A-site of for application as a high-temperature proton conductor was investigated. The synthesis of K-doped and its characterization by X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray analysis is described. Potassium-doped material was stable at high water-vapor pressures and up to , the maximum temperature of the autoclave treatment. Four-probe dc conductivity was measured on dense and porous (44% porosity) samples in varying partial pressures of oxygen, , over a temperature range from . Conductivity was measured as a function of atmosphere and temperature on porous samples to ensure attainment of equilibrium conditions in a reasonable time period. The dependence of total conductivity in a dry atmosphere on oxygen partial pressure could be described by the equation . The experimental data were fitted to this equation with good accuracy, from which the electron-hole and oxygen-ion conductivities were determined. The activation energies for oxygen-ion and electron-hole conduction were estimated to be 0.85 and , respectively. Conductivity measurements were also performed in -containing atmospheres as a function of water-vapor pressure, . A significant increase in total ionic conductivity was observed in humid atmospheres, which is attributed to high protonic contribution. Samples doped with potassium exhibit significantly higher ionic conductivity in humid atmosphere as compared to samples doped with yttrium. The enhanced ionic conductivity, which is mainly protonic, is attributed to the higher basicity of potassium. At high and low , potassium-doped exhibits predominantly electron-hole conduction, while at low and high it exhibits predominantly protonic conduction." @default.
• W2154197211 created "2016-06-24" @default.
• W2154197211 creator A5030291931 @default.
• W2154197211 creator A5041530739 @default.
• W2154197211 date "2006-01-01" @default.
• W2154197211 modified "2023-10-16" @default.
• W2154197211 title "Transport Properties of Potassium-Doped BaZrO[sub 3] in Oxygen- and Water-Vapor-Containing Atmospheres" @default.
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• W2154197211 doi "https://doi.org/10.1149/1.2203095" @default.
• W2154197211 hasPublicationYear "2006" @default.
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