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Ion irradiation of novel yttrium/ytterbium-based pyrochlores / Karl R. Whittle in Acta materialia, Vol. 59 N° 20 (Décembre 2011) 

Public ISBD [article]  in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7530–7537 Titre : Ion irradiation of novel yttrium/ytterbium-based pyrochlores : The effect of disorder Type de document : texte imprimé Auteurs : Karl R. Whittle, Auteur ; Mark G. Blackford, Auteur ; Robert D. Aughterson, Auteur Année de publication : 2012 Article en page(s) : pp. 7530–7537 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Radiation  damage  Pyrochlore  Oxide  dispersion  strengthened Résumé : Pyrochlores based on the general composition Ln2TiO5 (Ln2.67Ti1.33O6.67) and Ln2Ti2O7, where Ln = Y or Yb, have been irradiated through the crystalline–amorphous transition with 1 MeV Kr ions at the IVEM-TANDEM facility, Argonne National Laboratory. The results show that the Tc (critical temperature for amorphization) differs significantly between each series, e.g. for Y2TiO5 it is 589 ± 18 K and for Y2Ti2O7 665 ± 33 K. The difference suggests that recovery from damage is more rapid with increasing Ln content, i.e. a lower Tc for amorphization. These results are discussed in the context of the melting points of each phase, atomic disorder, the pyrochlore–fluorite order–disorder transition and the implications for oxide dispersion-strengthened additives. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006586 [article] Ion irradiation of novel yttrium/ytterbium-based pyrochlores : The effect of disorder [texte imprimé] / Karl R. Whittle, Auteur ; Mark G. Blackford, Auteur ; Robert D. Aughterson, Auteur . - 2012 . - pp. 7530–7537. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7530–7537 Mots-clés : Radiation  damage  Pyrochlore  Oxide  dispersion  strengthened Résumé : Pyrochlores based on the general composition Ln2TiO5 (Ln2.67Ti1.33O6.67) and Ln2Ti2O7, where Ln = Y or Yb, have been irradiated through the crystalline–amorphous transition with 1 MeV Kr ions at the IVEM-TANDEM facility, Argonne National Laboratory. The results show that the Tc (critical temperature for amorphization) differs significantly between each series, e.g. for Y2TiO5 it is 589 ± 18 K and for Y2Ti2O7 665 ± 33 K. The difference suggests that recovery from damage is more rapid with increasing Ln content, i.e. a lower Tc for amorphization. These results are discussed in the context of the melting points of each phase, atomic disorder, the pyrochlore–fluorite order–disorder transition and the implications for oxide dispersion-strengthened additives. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006586