Promoted Hydride/Oxide Exchange in SrTiO3 by Introduction of Anion Vacancy via Aliovalent Cation Substitution

Fumitaka Takeiri, Kohei Aidzu, Takeshi Yajima, Toshiaki Matsui, Takafumi Yamamoto, Yoji Kobayashi, James Hester, Hiroshi Kageyama

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We investigated topochemical anion exchange reactions for a ScIII-substituted SrTiIVO3 perovskite, Sr(Ti1-yScy)O3-y/2□y/2 (y ≤ 0.1), using CaH2. It was found that the initial introduction of a small amount of anion vacancies (y/2) is crucial to enhance the anion (H-/O2-) exchangeability. For example, hydride reduction of Sr(Ti0.95Sc0.05)O2.975 yielded the oxyhydride SrTi0.95Sc0.05O2.56H0.41 in which the hydride concentration is increased by 33% with respect to pristine SrTiO3 (leading to SrTiO2.76H0.24). This observation highlights the importance of anion vacancies to improve anion (H-/O2-) diffusion, which is a well-known strategy for improving oxide anion conductivity, and suggests that such a vacancy-assisted reaction could be applied to other anion exchange reactions (e.g., F-/O2- and N3-/O2-) to extend the solubility range.
Original languageEnglish (US)
Pages (from-to)13035-13040
Number of pages6
JournalInorganic Chemistry
Volume56
Issue number21
DOIs
StatePublished - Nov 6 2017
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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