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Swift-heavy ion irradiation response and annealing behavior of A 2 TiO 5 (A = Nd, Gd, and Yb)

Park, Sulgiye and Tracy, Cameron L. and Zhang, Fuxiang and Palomares, Raul I. and Park, Changyong and Trautmann, Christina and Lang, Maik and Mao, Wendy L. and Ewing, Rodney C. (2018):
Swift-heavy ion irradiation response and annealing behavior of A 2 TiO 5 (A = Nd, Gd, and Yb).
In: Journal of Solid State Chemistry, Elsevier Science Publishing, pp. 108-116, 258, ISSN 00224596,
DOI: 10.1016/j.jssc.2017.09.028,
[Online-Edition: https://doi.org/10.1016/j.jssc.2017.09.028],
[Article]

Abstract

The structural responses of A2BO5 (A = Nd, Gd, and Yb; B = Ti) compositions irradiated by high-energy Au ions (2.2 GeV) were investigated using transmission electron microscopy, synchrotron X-ray diffraction and Raman spectroscopy. The extent of irradiation-induced amorphization depends on the size of the A-site cation, with smaller lanthanides having less susceptibility to the accumulation of radiation damage. In the track-overlapping regime, complete amorphization is observed in all three compounds, despite the ability of Yb2TiO5 to incorporate a great deal of structural disorder into its initial defect-fluorite structure (Fm-3m). This is attributed to the high cation radius ratio (A:B = 2:1), which reduces the stability of the structure upon ion irradiation. The fully-amorphized samples were subsequently isochronally heated at temperature intervals from 100 °C to 850 °C. X-ray diffraction analysis indicated a similar damage recovery process in Nd2TiO5 and Gd2TiO5, where both compositions recover their original structures (Pnma) at 850 °C. In contrast, Yb2TiO5 exhibited recrystallization of a metastable, non-equilibrium orthorhombic phase at ~ 550 °C, prior to a transformation to the stable defect-fluorite phase (Fm-3m) at 625 °C. These compositional variations in radiation tolerance and thermal recovery processes are described in terms of the energetics of disordering during the damage and recrystallization processes.

Item Type: Article
Erschienen: 2018
Creators: Park, Sulgiye and Tracy, Cameron L. and Zhang, Fuxiang and Palomares, Raul I. and Park, Changyong and Trautmann, Christina and Lang, Maik and Mao, Wendy L. and Ewing, Rodney C.
Title: Swift-heavy ion irradiation response and annealing behavior of A 2 TiO 5 (A = Nd, Gd, and Yb)
Language: English
Abstract:

The structural responses of A2BO5 (A = Nd, Gd, and Yb; B = Ti) compositions irradiated by high-energy Au ions (2.2 GeV) were investigated using transmission electron microscopy, synchrotron X-ray diffraction and Raman spectroscopy. The extent of irradiation-induced amorphization depends on the size of the A-site cation, with smaller lanthanides having less susceptibility to the accumulation of radiation damage. In the track-overlapping regime, complete amorphization is observed in all three compounds, despite the ability of Yb2TiO5 to incorporate a great deal of structural disorder into its initial defect-fluorite structure (Fm-3m). This is attributed to the high cation radius ratio (A:B = 2:1), which reduces the stability of the structure upon ion irradiation. The fully-amorphized samples were subsequently isochronally heated at temperature intervals from 100 °C to 850 °C. X-ray diffraction analysis indicated a similar damage recovery process in Nd2TiO5 and Gd2TiO5, where both compositions recover their original structures (Pnma) at 850 °C. In contrast, Yb2TiO5 exhibited recrystallization of a metastable, non-equilibrium orthorhombic phase at ~ 550 °C, prior to a transformation to the stable defect-fluorite phase (Fm-3m) at 625 °C. These compositional variations in radiation tolerance and thermal recovery processes are described in terms of the energetics of disordering during the damage and recrystallization processes.

Journal or Publication Title: Journal of Solid State Chemistry
Volume: 258
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Ion Irradiation, High temperature, Radiation Response, Ion tracks
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 29 Dec 2017 12:35
DOI: 10.1016/j.jssc.2017.09.028
Official URL: https://doi.org/10.1016/j.jssc.2017.09.028
Funders: This work was supported by the Energy Frontier Research Center Materials Science of Actinides funded by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (Grant no. DE-SC0001089)., HPCAT operations are supported by DOE-NNSA under Award no. DE-NA0001974 and DOE-BES under Award no. DE-FG02-99ER45775, with partial instrumentation funding by NSF., The Advanced Photon Source is a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH1135., Use of the Advanced Photon Source was supported by the Carnegie/Department of Energy Alliance Center (CDAC, DE-FC03-03NA00144).
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