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LUNAM Université, Université de Nantes – Ecole Centrale Nantes, Institut de Recherche en Génie Civil et Mécanique UMR CNRS 6183, Equipe Etat Mécanique et Microstructure, 37 boulevard de l'Université, BP 406, 44602 Saint-Nazaire cedex, France
Université de Rennes 1, Institut des Sciences Chimiques de Rennes UMR CNRS 6226, Equipe Verres et Céramiques, 35042 Rennes Cedex, France
Université de Montpellier 2, Institut Charles Gerhardt UMR 5253, Equipe Chimie et Cristallographie des Matériaux, Place Eugène Bataillon, 34095 Montpellier Cedex5, France
Dalton Trans., 2013,42, 3896-3900
31 Oct 2012,
14 Dec 2012
First published online
17 Dec 2012
In situ neutron diffraction measurements of the nanocrystalline deuterated oxyhydroxide TiO(OD)2 compound were performed as a function of time and temperature under NH3 gas flow in order to study the hydrogen–deuterium exchange mechanism. Data were collected on the instrument D20 at the ILL (France) and the analysis of the kinetics was directly based on the contrast variation of the incoherent neutron cross section of hydrogen and deuterium. The time evolution of the hydrogenated phase fraction was described using the well-known Kolmogorov–Johnson–Mehl–Avrami (KJMA) expression. The H/D exchange reaction is complete within 140 s at 20 °C and within 120 s at 40 °C. The activation energy for the H/D exchange reaction is estimated to be 37 kJ mol−1.
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