In‐situ Synchrotron X‐ray Diffraction Study of the Formation of Cubic Li 2 TiO 3 Under Hydrothermal Conditions

Autor:	Bo B. Iversen, Karl Thomas Fehr, Andreas Laumann, Michael Holzapfel, Kirsten M. Ø. Jensen, Martin Bremholm, Christoffer Tyrsted
Rok vydání:	2011
Předmět:	Inorganic Chemistry Crystallography Chemistry Rietveld refinement Intercalation (chemistry) Nucleation Physical chemistry Hydrothermal synthesis Crystal growth Activation energy Powder diffraction Monoclinic crystal system
Zdroj:	Laumann, A, Jensen, K M Ø, Tyrsted, C, Bremholm, M, Fehr, K T, Holzapfel, M & Iversen, B B 2011, ' In-situ Synchrotron X-ray Diffraction Study of the Formation of Cubic Li 2 TiO 3 Under Hydrothermal Conditions ', European Journal of Inorganic Chemistry, vol. 14, pp. 2221-2226 . https://doi.org/10.1002/ejic.201001133
ISSN:	1099-0682 1434-1948
DOI:	10.1002/ejic.201001133
Popis:	Synchrotron powder X-ray diffraction (PXRD) has been used to study in-situ the hydrothermal intercalation of lithium ions in titania powder following the reaction TiO2 + 2 LiOH Li2TiO3 + H2O. Syntheses were performed in a sapphire capillary at temperatures between 133 and 230 °C. By sequential Rietveld refinement of the PXRD data, the particle growth of the metastable cubic α-Li2TiO3 compound was determined as a function of the reaction time, as well as the transformation of the cubic α-phase to its stable monoclinic β-modifications at a temperature above the critical point of water. The reactions were presumed to be controlled by nucleation and crystal growth, and therefore the Avrami-Erofe'ef equation was applied to model the reaction mechanisms of this intercalation process and an activation energy of 66(7) kJ/mol was determined.
Databáze:	OpenAIRE
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