Structural and conductivity evolution of fluorite-type Bi2O3-Er2O3-PbO solid electrolytes during long-term annealing
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Date
2008-08
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Elsevier
Abstract
Quenched-in fcc fluorite-type materials in the Bi2O3-Er2O3-PbO system were annealed in air at 500 and 600 degrees C for up to 2000 h. Each material experienced a conductivity-lowering structural transformation, thus making them unsuitable for use in SOFCs. For example, the materials (BiO1.5)(0.80)(ErO1.5)(0.20-x)(PbO)(x), x = 0.03, 0.06 and 0.09, underwent a fluorite-type to tetragonal transformation during annealing at 500 degrees C due to (100) oxide-ion vacancy ordering, and the rate of conductivity decay at 500 degrees C increased with increasing Pb2+/Er3+ ratio. © 2008, Elsevier Ltd.
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Keywords
Annealing, Electrolytes, Crystal structure, Sintered materials, Thermal conductivity, Fluorite
Citation
Webster, N. A. S., Ling, C. D., Raston, C. L., & Lincoln, F. J. (2008). Structural and conductivity evolution of fluorite-type Bi2O3-Er2O3-PbO solid electrolytes during long-term annealing. Solid State Ionics, 179(19-20), 697-705. doi:10.1016/j.ssi.2008.04.016