The effect of K+ ion exchange on the structure and thermal reduction of hexagonal ammonium tungsten bronze

I. M. Szilágyi, J. Madarász, G. Pokol, F. Hange, G. Szalontai, Katalin Varga-Josepovits, A. L. Tóth

Research output: Article

25 Citations (Scopus)

Abstract

This paper discusses the changes in the structure and thermal reduction of nanosize hexagonal ammonium tungsten bronze (HATB), (NH4) 0.33-xWO3-y, which were caused by K+ ion exchange (doping) and studied by XRD, XPS, 1H-MAS NMR, FTIR, SEM and TG/DTA-MS. Comparison of the cell parameters of undoped and doped HATB revealed that both a and c cell parameters decreased after the ion exchange reaction, which showed that smaller K+ ions partly replaced the larger NH 4 + ions in the hexagonal channels of HATB. After the reaction, from the hexagonal channels less NH3 evolved, which also supported the incorporation of K+ ions into the hexagonal channels.

Original languageEnglish
Pages (from-to)11-18
Number of pages8
JournalJournal of Thermal Analysis and Calorimetry
Volume97
Issue number1
DOIs
Publication statusPublished - júl. 1 2009

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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