Ion-exchangeable, electronically conducting layered perovskite oxyfluorides

Yoji Kobayashi, Mingliang Tian, Miharu Eguchi, Thomas E. Mallouk

Research output: Contribution to journalArticle

76 Scopus citations

Abstract

Cation-exchangeable d0 layered perovskites are amenable to intercalation, exfoliation, and a variety of topochemical reactions, but they lack the interesting electronic and magnetic functionalities of mixed-valent perovskites. Conversely, electronically and magnetically interesting layered perovskites lack scope in terms of interlayer chemistry. To bridge this gap, the insulating, cation-exchangeable layered perovskites RbLaNb2O 7, KCa2Nb3O10, and NaYTiO 4 were reacted with poly(tetrafluoroethylene) under inert atmosphere conditions to yield layer perovskites in which some of the oxygen is substituted by fluorine. In the fluorinated materials, the B-site cations are reduced to a mixed-valent state without introducing oxygen vacancies into the anion sublattice. The resulting electronically conducting solids can be exposed to air and water and even ion-exchanged in acid without oxidation of the B-site cations. Electronic transport measurements on the air-stable RbLaNb 2O6F reveal room-temperature conductivity (2-7 × 102 Ω·cm) via a variable-range hopping mechanism, which is not substantially changed after aqueous proton exchange to H 1-xRbxLaNb2O6F (x ≈ 0.2).

Original languageEnglish (US)
Pages (from-to)9849-9855
Number of pages7
JournalJournal of the American Chemical Society
Volume131
Issue number28
DOIs
StatePublished - Jul 22 2009

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Fingerprint Dive into the research topics of 'Ion-exchangeable, electronically conducting layered perovskite oxyfluorides'. Together they form a unique fingerprint.

  • Cite this