Phase formation and electrical conductivity of Ba-doped LaScO3

Kyu Hyoung Lee, Hye Lim Kim, Shin Kim, Hong Lim Lee

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Abstract

Phase formation and conduction behavior in BaO-doped LaScO3with the perovskite structure have been investigated. The structures of La 1-xBaxScO3-δ were analyzed to be cubic for La0.6Ba0.4ScO1-δ and La 0.5Ba0.5ScO3-δ, a mixture of cubic and orthorhombic for La0.9Ba0.1ScO3-δ, La0.8Ba0.2ScO3-δ and La 0.7Ba0.3ScO3-δ, and orthorhombic for La0.95Ba0.05ScO3-δ. La 1-xBaxScO3-δ showed a pure oxide-ion conduction below intermediate oxygen partial pressures under dry atmosphere. At high oxygen partial pressures, it exhibited mixed oxide-ion and p-type electronic conduction. In the presence of water vapor, proton conduction was observed due to the formation of protonic defects and the bulk conductivity by protons was highest in the composition of La0.5Ba 0.5ScO2.75. The apparent activation energy for proton conduction was almost the same in each compound, 0.66-0.68 eV, despite the differences in crystal structure and A-site dopant concentration.

Original languageEnglish
Pages (from-to)5025-5029
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume44
Issue number7 A
DOIs
Publication statusPublished - 2005 Jul 8

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All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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