Hydration behavior of Ba2Sc2O5 with an oxygen-deficient perovskite structure

Takahisa Omata, Tomonao Fuke, Shinya Otsuka-Yao-Matsuo

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The hydration behavior of the barium scandates with oxygen-deficient perovskite-related structures of tetragonal Ba2Sc2O5 and cubic BaScO3-δ (δ ∼ 0.5) was studied. Both the tetragonal Ba2Sc2O5 and cubic BaScO3-δ absorbed water and formed Ba2Sc2O5·0.60H2O and BaScO3-δ·0.37H2O, respectively, during cooling in a humidified atmosphere. The hydration and the dehydration temperatures for the barium scandates were ∼ 533 K and ∼ 553 K, respectively; these temperatures were 30-70 K lower than that for Ba2In2O5. A distinct difference in the hydration behavior of the structurally different tetragonal Ba2Sc2O5 and cubic BaScO3-δ was not observed. The Ba2Sc2O5 shows protonic conduction below 673 K and p-type conduction above 773 K in a humidified atmosphere.

Original languageEnglish
Pages (from-to)2447-2451
Number of pages5
JournalSolid State Ionics
Volume177
Issue number26-32 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Oct 31
Externally publishedYes

Keywords

  • Barium scandate
  • Electrical conductivity
  • Hydration
  • Proton conductor
  • Thermogravimetry

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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