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X-Ray diffraction study of oxygen deficient Y2Ti2O7-δ pyrochlore powders synthesized by high-energy ball milling (HEBM)

Laurent Chaffron 1 Joel Ribis 2 Pierre-Francois Giroux 1 Thierry Gloriant David Simeone 2 
1 LTMEx - Laboratoire des Technologies des Matériaux EXtrêmes
SRMA - Service des Recherches Métallurgiques Appliquées : DEN/DMN/SRMA
2 LA2M - Laboratoire d'Analyse Microstructurale des Matériaux
SRMA - Service des Recherches Métallurgiques Appliquées : DEN/DMN/SRMA
Abstract : Y2Ti2O7 pyrochlore are widely used for various applications, from oxygen transport to materials strengthening. Ultra-pure oxygen deficient Y2Ti2O7-δ pyrochlore powders synthesized by high-energy ball milling (HEBM) are studied by X-ray diffraction (XRD). Rietveld analysis of diffraction patterns reveals that a large oxygen sub-stoichiometry can be accommodated in this material with only minor structural changes. This accommodation results from the ability of Ti ions to change their valence state, which is confirmed by complementary EELS analysis. It may also explain why Y2Ti2O7 is both radiation and mechanical milling resistant. This work highlights the fact that selection of cations allows rigid ionic structures like pyrochlore to accommodate a large amount of point defects.
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https://hal-cea.archives-ouvertes.fr/cea-03773105
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Submitted on : Thursday, September 8, 2022 - 6:30:20 PM
Last modification on : Saturday, September 10, 2022 - 3:26:04 AM

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Laurent Chaffron, Joel Ribis, Pierre-Francois Giroux, Thierry Gloriant, David Simeone. X-Ray diffraction study of oxygen deficient Y2Ti2O7-δ pyrochlore powders synthesized by high-energy ball milling (HEBM). Journal of Solid State Chemistry, Elsevier, 2022, Volume 315, pp.123446. ⟨10.1016/j.jssc.2022.123446⟩. ⟨cea-03773105⟩

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