Jump to main content
Jump to site search

Issue 9, 2018

Radiation-induced disorder in compressed lanthanide zirconates

Author affiliations

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

Supplementary files

Article information


Submitted
28 Dec 2017
Accepted
06 Feb 2018
First published
12 Feb 2018

Phys. Chem. Chem. Phys., 2018,20, 6187-6197
Article type
Paper

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements