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Issue 9, 2018
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Radiation-induced disorder in compressed lanthanide zirconates

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Abstract

The effects of swift heavy ion irradiation-induced disordering on the behavior of lanthanide zirconate compounds (Ln2Zr2O7 where Ln = Sm, Er, or Nd) at high pressures are investigated. After irradiation with 2.2 GeV 197Au ions, the initial ordered pyrochlore structure (Fd[3 with combining macron]m) transformed to a defect-fluorite structure (Fm[3 with combining macron]m) in Sm2Zr2O7 and Nd2Zr2O7. For irradiated Er2Zr2O7, which has a defect-fluorite structure, ion irradiation induces local disordering by introducing Frenkel defects despite retention of the initial structure. When subjected to high pressures (>29 GPa) in the absence of irradiation, all of these compounds transform to a cotunnite-like (Pnma) phase, followed by sluggish amorphization with further compression. However, if these compounds are irradiated prior to compression, the high pressure cotunnite-like phase is not formed. Rather, they transform directly from their post-irradiation defect-fluorite structure to an amorphous structure upon compression (>25 GPa). Defects and disordering induced by swift heavy ion irradiation alter the transformation pathways by raising the energetic barriers for the transformation to the high pressure cotunnite-like phase, rendering it inaccessible. As a result, the high pressure stability field of the amorphous phase is expanded to lower pressures when irradiation is coupled with compression. The responses of materials in the lanthanide zirconate system to irradiation and compression, both individually and in tandem, are strongly influenced by the specific lanthanide composition, which governs the defect energetics at extreme conditions.

Graphical abstract: Radiation-induced disorder in compressed lanthanide zirconates

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Publication details

The article was received on 28 Dec 2017, accepted on 06 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C7CP08664D
Citation: Phys. Chem. Chem. Phys., 2018,20, 6187-6197
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    Radiation-induced disorder in compressed lanthanide zirconates

    S. Park, C. L. Tracy, F. Zhang, C. Park, C. Trautmann, S. N. Tkachev, M. Lang, W. L. Mao and R. C. Ewing, Phys. Chem. Chem. Phys., 2018, 20, 6187
    DOI: 10.1039/C7CP08664D

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