Ion-exchange reaction of a-site in A2Ta2O6 pyrochlore crystal structure

M. Matsunami*, T. Hashizume, A. Saiki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Na+ or K+ ion rechargeable battery is started to garner attention recently in Place of Li+ ion cell. It is important that A+ site ion can move in and out the positive-electrode materials. When K2Ta2O6 powder had a pyrochlore structure was only dipped into NaOH aqueous solution at room temperature, Na2Ta2O6 was obtained. K2Ta2O6 was fabricated from a tantalum sheet by a hydrothermal synthesize with KOH aqueous solution. When Na2Ta2O6 was dipped into KOH aqueous solution, K2Ta2O6 was obtained again. If KTaO3 had a perovskite structure was dipped, Ion-exchange was not observed by XRD. Because a lattice constant of pyrochlore structure of K-Ta-O system is bigger than perovskite, K+ or Na+ ion could shinny through and exchange between Ta5+ and O2- ion site in a pyrochlore structure. K+ or Na+ ion exchange of A2Ta2O6 pyrochlore had reversibility. Therefore, A2Ta2O6 had a pyrochlore structure can be expected such as Na+ ion rechargeable battery element.

Original languageEnglish
Pages (from-to)941-944
Number of pages4
JournalArchives of Metallurgy and Materials
Volume60
Issue number2A
DOIs
StatePublished - 2015

Keywords

  • KTaO;NaTaO;Ion-exchange
  • Perovskite structure
  • Pyrochlore structure

ASJC Scopus subject areas

  • Metals and Alloys

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