期刊
SOLID STATE IONICS
卷 213, 期 -, 页码 36-41出版社
ELSEVIER
DOI: 10.1016/j.ssi.2011.02.011
关键词
High temperature proton conductor; Barium zirconate; Spark plasma sintering; Impedance spectroscopy; Transmission electron microscopy; Isotope effect; Space charge layer
10% yttrium doped barium zirconate (BZY10) was synthesized by solid state reaction and a 99.8% dense and transparent sample was prepared by spark plasma sintering (SPS) at 1700 degrees C for 5 minutes. A single phase compound was obtained, with no evaporation of barium. High-Resolution Transmission Electron Microscopy (HRTEM) images revealed a distinct grain boundary across two grains, confirming no secondary phase formation along grain boundaries. The conductivity was determined as a function of temperature, at two different water vapor pressures, as well as in the D2O vapor exchanged state. The activation energy corresponding to protonic conduction has been determined, and compared to values from literature. The decrease in activation energy with increasing lattice parameters is confirmed. Furthermore, the effective space charge layer width has been estimated at 1.2-1.3 nm. (c) 2011 Elsevier B.V. All rights reserved.
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