Influence of residual sodium on the formation and reductive decomposition of hexagonal tungsten oxide

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Abstract

The kinetic influence of sodium on the transformation/dehydration of WO3·1/3H2O into h-WO3 and on the hydrogen reduction of h-WO3 into elemental tungsten was studied. The dehydration experiments of WO3·1/3H2O into h-WO3 were carried out either at isothermal conditions or in thermal gravimetry equipment, where oxygen loss from the oxide during H2 reduction was also followed. X-ray powder patterns were recorded after each isothermal heat treatment and thermal analysis. The sodium concentration of the WO3·1/3H2O samples influenced the time of heat treatment needed for the dehydration/phase transformations as demonstrated on X-ray diffraction spectroscopy.

Original languageEnglish
Pages (from-to)1103-1105
Number of pages3
JournalJournal of Materials Science Letters
Volume18
Issue number14
DOIs
Publication statusPublished - 1999

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Dehydration
Tungsten
Sodium
Decomposition
Oxides
Heat treatment
Gravimetric analysis
Powders
Thermoanalysis
Hydrogen
Phase transitions
Spectroscopy
Oxygen
X ray diffraction
X rays
Kinetics
tungsten oxide
Experiments

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

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abstract = "The kinetic influence of sodium on the transformation/dehydration of WO3·1/3H2O into h-WO3 and on the hydrogen reduction of h-WO3 into elemental tungsten was studied. The dehydration experiments of WO3·1/3H2O into h-WO3 were carried out either at isothermal conditions or in thermal gravimetry equipment, where oxygen loss from the oxide during H2 reduction was also followed. X-ray powder patterns were recorded after each isothermal heat treatment and thermal analysis. The sodium concentration of the WO3·1/3H2O samples influenced the time of heat treatment needed for the dehydration/phase transformations as demonstrated on X-ray diffraction spectroscopy.",
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T1 - Influence of residual sodium on the formation and reductive decomposition of hexagonal tungsten oxide

AU - Pfeifer, J.

AU - Balázsi, C.

AU - Kiss, B. A.

AU - Pécz, B.

AU - Tóth, A.

PY - 1999

Y1 - 1999

N2 - The kinetic influence of sodium on the transformation/dehydration of WO3·1/3H2O into h-WO3 and on the hydrogen reduction of h-WO3 into elemental tungsten was studied. The dehydration experiments of WO3·1/3H2O into h-WO3 were carried out either at isothermal conditions or in thermal gravimetry equipment, where oxygen loss from the oxide during H2 reduction was also followed. X-ray powder patterns were recorded after each isothermal heat treatment and thermal analysis. The sodium concentration of the WO3·1/3H2O samples influenced the time of heat treatment needed for the dehydration/phase transformations as demonstrated on X-ray diffraction spectroscopy.

AB - The kinetic influence of sodium on the transformation/dehydration of WO3·1/3H2O into h-WO3 and on the hydrogen reduction of h-WO3 into elemental tungsten was studied. The dehydration experiments of WO3·1/3H2O into h-WO3 were carried out either at isothermal conditions or in thermal gravimetry equipment, where oxygen loss from the oxide during H2 reduction was also followed. X-ray powder patterns were recorded after each isothermal heat treatment and thermal analysis. The sodium concentration of the WO3·1/3H2O samples influenced the time of heat treatment needed for the dehydration/phase transformations as demonstrated on X-ray diffraction spectroscopy.

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