The influence of temperature on the structural behaviour of sodium tri- and hexa-titanates and their protonated forms

Szilvia Papp, L. Kõrösi, Vera Meynen, Pegie Cool, Etienne F. Vansant, I. Dékány

Research output: Contribution to journalArticle

109 Citations (Scopus)

Abstract

The thermal stability of Na2Ti3O7 and Na2Ti6O13, together with that of their protonated forms was investigated. The influence of temperature on the structural behaviour of tri- and hexa-titanates was studied using DTG, XRD, FTIR and FT-Raman. These results were correlated with the nature of the exchangeable cations using elemental analysis and N2-sorption. The tunnel structure of Na2Ti6O13 revealed a higher thermal stability compared to the layered structure of Na2Ti 3O7 that shows traces of dimerisation above 800 °C. The sodium forms were observed to be more thermally stable compared to their protonated forms. However, analysis show that 'H2Ti6O 13' is much more thermally stable than the layered H 2Ti3O7 which go through structural changes above 250 °C and suffer a complete structural collapse into anatase/rutile above 800 °C. It was obvious that thermal stability was significantly influenced by the nature of the exchangeable cations and the degree of ion-exchange.

Original languageEnglish
Pages (from-to)1614-1619
Number of pages6
JournalJournal of Solid State Chemistry
Volume178
Issue number5
DOIs
Publication statusPublished - May 2005

Fingerprint

titanates
Thermodynamic stability
thermal stability
Sodium
sodium
Cations
Positive ions
cations
Dimerization
dimerization
anatase
rutile
Titanium dioxide
sorption
Temperature
temperature
tunnels
Sorption
Ion exchange
Tunnels

Keywords

  • Ion-exchange
  • Thermal stability
  • Titanates

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

The influence of temperature on the structural behaviour of sodium tri- and hexa-titanates and their protonated forms. / Papp, Szilvia; Kõrösi, L.; Meynen, Vera; Cool, Pegie; Vansant, Etienne F.; Dékány, I.

In: Journal of Solid State Chemistry, Vol. 178, No. 5, 05.2005, p. 1614-1619.

Research output: Contribution to journalArticle

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AU - Cool, Pegie

AU - Vansant, Etienne F.

AU - Dékány, I.

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AB - The thermal stability of Na2Ti3O7 and Na2Ti6O13, together with that of their protonated forms was investigated. The influence of temperature on the structural behaviour of tri- and hexa-titanates was studied using DTG, XRD, FTIR and FT-Raman. These results were correlated with the nature of the exchangeable cations using elemental analysis and N2-sorption. The tunnel structure of Na2Ti6O13 revealed a higher thermal stability compared to the layered structure of Na2Ti 3O7 that shows traces of dimerisation above 800 °C. The sodium forms were observed to be more thermally stable compared to their protonated forms. However, analysis show that 'H2Ti6O 13' is much more thermally stable than the layered H 2Ti3O7 which go through structural changes above 250 °C and suffer a complete structural collapse into anatase/rutile above 800 °C. It was obvious that thermal stability was significantly influenced by the nature of the exchangeable cations and the degree of ion-exchange.

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