Comparison of short-range order in irradiated dysprosium titanates

Sherrod, Roman; O’Quinn, Eric C.; Gussev, Igor M.; Overstreet, Cale; Neuefeind, Joerg; Lang, Maik K.

doi:10.1038/s41529-021-00165-6

Title: Comparison of short-range order in irradiated dysprosium titanates

Journal Article · 15 April 2021 · npj Materials Degradation

DOI: https://doi.org/10.1038/s41529-021-00165-6 · OSTI ID:1777652

Sherrod, Roman; O’Quinn, Eric C.; Gussev, Igor M.;

;

Abstract The structural response of Dy ₂ TiO ₅ oxide under swift heavy ion irradiation (2.2 GeV Au ions) was studied over a range of structural length scales utilizing neutron total scattering experiments. Refinement of diffraction data confirms that the long-range orthorhombic structure is susceptible to ion beam-induced amorphization with limited crystalline fraction remaining after irradiation to 8 × 10 ¹² ions/cm ² . In contrast, the local atomic arrangement, examined through pair distribution function analysis, shows only subtle changes after irradiation and is still described best by the original orthorhombic structural model. A comparison to Dy ₂ Ti ₂ O ₇ pyrochlore oxide under the same irradiation conditions reveals a different behavior: while the dysprosium titanate pyrochlore is more radiation resistant over the long-range with smaller degree of amorphization as compared to Dy ₂ TiO ₅ , the former involves more local atomic rearrangements, best described by a pyrochlore-to-weberite-type transformation. These results highlight the importance of short-range and medium-range order analysis for a comprehensive description of radiation behavior.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS)

Grant/Contract Number:: SC0014664; SC0020321

OSTI ID:: 1777652

Journal Information:: npj Materials Degradation, Journal Name: npj Materials Degradation Journal Issue: 1 Vol. 5; ISSN 2397-2106

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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