title: Study of the thermal nitridation of nanocrystalline Ti(OH)4 by X-ray and in situ neutron powder diffraction.
abstract: In situ neutron diffraction measurements of nanocrystalline titanium oxynitrides were performed, as a function of temperature and time, to explore the nitrogen/oxygen substitution mechanism occurring during their synthesis by reaction of gaseous ammonia with nanocrystalline Ti(OH)(4). These neutron diffraction experiments are supported by chemical analysis and X-ray diffraction, allowing the description of the structural variations and ordering process between the Ti(O/N)(2) anatase and the Ti(O/N) rock-salt phases. Our results show that the formation of the Ti(O/N) rock-salt phase goes along with the creation of vacancies on the Ti sites and that the N/O substitution proceeds but without N/O ordering.
authors.affiliation: 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. vincent.legrand@univ-nantes.fr
authors.forename: Vincent
authors.initials: V
authors.lastname: Legrand
authors.forename: Odile
authors.initials: O
authors.lastname: Merdrignac-Conanec
authors.forename: Werner
authors.initials: W
authors.lastname: Paulus
authors.forename: Thomas
authors.initials: T
authors.lastname: Hansen