Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/10943
Title: The ion-irradiation tolerance of the pyrochlore to fluorite Ho(x)Yb(2-x)TiO5 and Er2TiO5 compounds: a TEM comparative study using both in-situ and bulk ex-situ irradiation approaches
Authors: Aughterson, RD
Lumpkin, GR
Smith, KL
de los Reyes, M
Davis, J
Avdeev, M
Ridgway, MC
Cairney, JM
Keywords: Transmission electron microscopy
Irradiation
Ceramics
Crystallography
Pyrochlore
Ytterbium
Rare earths
Crystal Structure
Issue Date: 15-Aug-2018
Publisher: Elsevier
Citation: Aughterson, R. D., Lumpkin, G. R., Smith, K. L., de los Reyes, M., Davis, J., Avdeev, M., Ridgway, M. C., & Cairney, J. M. (2018). The ion-irradiation tolerance of the pyrochlore to fluorite Ho(x)Yb(2-x)TiO5 and Er2TiO5 compounds: a TEM comparative study using both in-situ and bulk ex-situ irradiation approaches. Journal of Nuclear Materials, 507, 316-326, doi:10.1016/j.jnucmat.2018.05.026
Abstract: We refine the crystal structures of a systematic series of compounds with the general composition Ho(x)Yb(2-x)TiO5 (x = 2, 1.6, 1.2, 1, 0.8, 0.4, 0) and Er2TiO5 and find a transition from defect-pyrochlore to defect-fluorite structure with increasing ytterbium content, decreasing lanthanide radius. Short-range structure modulations consisting of pyrochlore-like nano-domains are systematically characterised using transmission electron microscopy. We test the Kr2+ 1 MeV ion-irradiation response of Ho2TiO5, HoYbTiO5, Yb2TiO5, and Er2TiO5, via the crystalline to amorphous transition observed by using the in-situ TEM approach. The critical dose of amorphisation, Dc, was measured at various temperatures and used to calculate the critical temperature for maintaining crystallinity, Tc. A trend of lower Tc values with decreasing lanthanide radius is found. We describe a new approach for determining Tc values using cross-sectional TEM analysis of ex-situ bulk irradiated, 1 MeV Se+, samples; Ho2TiO5, HoYbTiO5 and Yb2TiO5. The results of Dc and Tc values using the two approaches vary; however the trends across the sample system remain the same. © 2018 Published by Elsevier B.V.
URI: https://doi.org/10.1016/j.jnucmat.2018.05.026
https://apo.ansto.gov.au/dspace/handle/10238/10943
ISSN: 0022-3115
Appears in Collections:Journal Articles

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