Response of Gd2Ti2O7 and La2Ti2O7 to swift-heavy ion irradiation and annealing

Park, Sulgiye; Lang, Maik; Tracy, Cameron L.; Zhang, Jiaming; Zhang, Fuxiang; Trautmann, Christina; Rodriguez, Matias D.; Kluth, Patrick; Ewing, Rodney C.

doi:10.1016/j.actamat.2015.04.010

Response of Gd₂Ti₂O₇ and La₂Ti₂O₇ to swift-heavy ion irradiation and annealing

Journal Article · Mon Apr 27 00:00:00 EDT 2015 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2015.04.010· OSTI ID:1370869

Park, Sulgiye ^[1]; Lang, Maik ^[2]; Tracy, Cameron L. ^[3]; Zhang, Jiaming ^[1]; Zhang, Fuxiang ^[3]; Trautmann, Christina ^[4]; Rodriguez, Matias D. ^[5]; Kluth, Patrick ^[5]; Ewing, Rodney C. ^[1]

Stanford Univ., CA (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt (Germany); Technische Univ. Darmstadt (Germany)
Australian National Univ., Canberra (Australia)

Swift heavy ion (2 GeV ¹⁸¹Ta) irradiation-induced amorphization and temperature-induced recrystallization of cubic pyrochlore Gd₂Ti₂O₇ (Fd3¯m) are compared with the response of a compositionally-similar material with a monoclinic-layered perovskite-type structure, La₂Ti₂O₇ (P2₁). The averaged electronic energy loss, dE/dx, was 37 keV/nm and 35 keV/nm in Gd₂Ti₂O₇ and La₂Ti₂O₇, respectively. Systematic analysis of the structural modifications was completed using transmission electron microscopy, synchrotron X-ray diffraction, Raman spectroscopy, and small-angle X-ray scattering. Increasing ion-induced amorphization with increasing ion fluence was evident in the X-ray diffraction patterns of both compositions by a reduction in the intensity of the diffraction maxima concurrent with the growth in intensity of a broad diffuse scattering halo. Transmission electron microscopy analysis showed complete amorphization within ion tracks (diameter: ~10 nm) for the perovskite-type material; whereas a concentric, core–shell morphology was evident in the ion tracks of the pyrochlore, with an outer shell of disordered yet still crystalline material with the fluorite structure surrounding an amorphous track core (diameter: ~9 nm). The radiation response of both titanate oxides with the same stoichiometry can be understood in terms of differences in their structures and compositions. While the radiation damage susceptibility of pyrochlore A₂B₂O₇ materials decreases as a function of the cation radius ratio rA/rB, the current study correlates this behavior with the stability field of monoclinic structures, where rLa/rTi > rGd/rTi. Isochronal annealing experiments of the irradiated materials showed complete recrystallization of La₂Ti₂O₇ at 775 °C and of Gd₂Ti₂O₇ at 850 °C. The annealing behavior is discussed in terms of enhanced damage recovery in La₂Ti₂O₇, compared to the pyrochlore compounds Gd₂Ti₂O₇. As a result, the difference in the recrystallization behavior may be related to structural constraints, i.e., reconstructing a low symmetry versus a high symmetry phase.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0001089

OSTI ID:: 1370869

Alternate ID(s):: OSTI ID: 1250995

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 93; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Hybrid excitation mechanism of upconversion fluorescence in hollow La2Ti2O7: Tm3+/Yb3+ submicron fibers Zhou, Run; Lin, Peijian; Pun, Edwin Yue Bun Journal of Materials Science, Vol. 55, Issue 11 https://doi.org/10.1007/s10853-019-04306-w	journal	December 2019
Effect of structure and composition on the electronic excitation induced amorphization of La2Ti2−xZrxO7 ceramics Sassi, Michel; Kaspar, Tiffany; Rosso, Kevin M. Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-44621-5	journal	June 2019

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Related Subjects

36 MATERIALS SCIENCE
X-ray diffraction
annealing
materials and chemistry by design
nuclear (including radiation effects)
perovskites
pyrochlores
swift heavy ion
synthesis (novel materials)
synthesis (self-assembly)