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, K. Josepovits, A. L. Tóth

Research output: Contribution to journalArticle

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 - Jul 2009

Fingerprint

Tungsten
Bronze
bronzes
Ammonium Compounds
Ion exchange
tungsten
Ions
ions
Differential thermal analysis
X ray photoelectron spectroscopy
Doping (additives)
Nuclear magnetic resonance
Scanning electron microscopy
cells
thermal analysis
Hot Temperature
nuclear magnetic resonance
scanning electron microscopy

Keywords

  • H-MAS NMR
  • Hexagonal ammonium tungsten bronze
  • Ion exchange
  • Reduction
  • SEM
  • TG/DTA-MS
  • XPS
  • XRD

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics

Cite this

The effect of K+ ion exchange on the structure and thermal reduction of hexagonal ammonium tungsten bronze. / Szilágyi, I. M.; Madarász, J.; Pokol, G.; Hange, F.; Szalontai, G.; Josepovits, K.; Tóth, A. L.

In: Journal of Thermal Analysis and Calorimetry, Vol. 97, No. 1, 07.2009, p. 11-18.

Research output: Contribution to journalArticle

@article{9276c41519604a90aaae124701869125,
title = "The effect of K+ ion exchange on the structure and thermal reduction of hexagonal ammonium tungsten bronze",
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.",
keywords = "H-MAS NMR, Hexagonal ammonium tungsten bronze, Ion exchange, Reduction, SEM, TG/DTA-MS, XPS, XRD",
author = "Szil{\'a}gyi, {I. M.} and J. Madar{\'a}sz and G. Pokol and F. Hange and G. Szalontai and K. Josepovits and T{\'o}th, {A. L.}",
year = "2009",
month = "7",
doi = "10.1007/s10973-008-9752-1",
language = "English",
volume = "97",
pages = "11--18",
journal = "Journal of Thermal Analysis and Calorimetry",
issn = "1388-6150",
publisher = "Springer Netherlands",
number = "1",

}

TY - JOUR

T1 - The effect of K+ ion exchange on the structure and thermal reduction of hexagonal ammonium tungsten bronze

AU - Szilágyi, I. M.

AU - Madarász, J.

AU - Pokol, G.

AU - Hange, F.

AU - Szalontai, G.

AU - Josepovits, K.

AU - Tóth, A. L.

PY - 2009/7

Y1 - 2009/7

N2 - 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.

AB - 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.

KW - H-MAS NMR

KW - Hexagonal ammonium tungsten bronze

KW - Ion exchange

KW - Reduction

KW - SEM

KW - TG/DTA-MS

KW - XPS

KW - XRD

UR - http://www.scopus.com/inward/record.url?scp=70350152936&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70350152936&partnerID=8YFLogxK

U2 - 10.1007/s10973-008-9752-1

DO - 10.1007/s10973-008-9752-1

M3 - Article

AN - SCOPUS:70350152936

VL - 97

SP - 11

EP - 18

JO - Journal of Thermal Analysis and Calorimetry

JF - Journal of Thermal Analysis and Calorimetry

SN - 1388-6150

IS - 1

ER -