Proton diffusion in LaSrScO3 single crystals studied by in-situ infrared absorption spectroscopy

J. Liu, H. Yugami

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The diffusivity of protons in Sr2+-doped LaScO3 single crystals was determined by in-situ infrared absorption spectroscopy. It was found that the high-temperature absorption spectrum shows a broad peak due to O-H stretching bands, which differs from that observed at room temperature. The diffusion coefficient was evaluated by two different methods: (1) suddenly changing the water vapor partial pressure and (2) exchanging H2O and D2O-saturated atmospheres. The diffusion and the activation energy are limited mainly by the diffusivity of oxygen ion vacancies based on the first measurement method at high temperatures. The proton self-diffusion coefficients were obtained by using the second measurement method, and the activation energy is 0.51 eV.

Original languageEnglish
Pages (from-to)1507-1511
Number of pages5
JournalSolid State Ionics
Volume178
Issue number27-28
DOIs
Publication statusPublished - 2007 Nov 1

Keywords

  • Diffusion coefficient
  • In-situ infrared absorption
  • LaSrScO
  • Proton conductors

ASJC Scopus subject areas

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

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