| Titre : | Ion irradiation of novel yttrium/ytterbium-based pyrochlores : The effect of disorder (2012) |
| Auteurs : | Karl R. Whittle, Auteur ; Mark G. Blackford, Auteur ; Robert D. Aughterson, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Acta materialia (Vol. 59 N° 20, Décembre 2011) |
| Article en page(s) : | pp. 7530–7537 |
| Note générale : | Métallurgie |
| Langues : | Anglais |
| Tags : | 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 |
