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Title: Phase transformations in Ln 2 O 3 materials irradiated with swift heavy ions

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [3];  [4];  [5]
  1. Univ. of Michigan, Ann Arbor, MI (United States); Stanford Univ., CA (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Univ. of Michigan, Ann Arbor, MI (United States); Yanshan Univ., Hebei (China)
  4. GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt (Germany); Technische Univ. Darmstadt (Germany)
  5. Stanford Univ., CA (United States)

Phase transformations induced in the cubic C-type lanthanide sesquioxides, Ln2O3 (Ln = Sm, Gd, Ho, Tm, and Lu), by dense electronic excitation are investigated. The structural modifications resulting from exposure to beams of 185 MeV Xe and 2246 MeV Au ions are characterized using synchrotron x-ray diffraction and Raman spectroscopy. The formation of a B-type polymorph, an X-type nonequilibrium phase, and an amorphous phase are observed. The specific phase formed and the transformation rate show dependence on the material composition, as well as the ion beam mass and energy. Atomistic mechanisms for these transformations are determined, indicating that formation of the B-type phase results from the production of anti-Frenkel defects and the aggregation of anion vacancies into planar clusters, whereas formation of the X-type and amorphous phases requires extensive displacement of both anions and cations. Here, the observed variations in phase behavior with changing lanthanide ionic radius and deposited electronic energy density are related to the energetics of these transformation mechanisms.

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)
Grant/Contract Number:
SC0001089; DGE-1256260; EAR01-35554
OSTI ID:
1370871
Alternate ID(s):
OSTI ID: 1224917
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 17; Related Information: MSA partners with University of Notre Dame (lead); University of California, Davis; Florida State University; George Washington University; University of Michigan; University of Minnesota; Oak Ridge National Laboratory; Oregon state University; Rensselaer Polytechnic Institute; Savannah River National Laboratory; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (2)

Ab Initio Study on Structure, Elastic, and Mechanical Properties of Lanthanide Sesquioxides journal February 2018
Assessing a thermal spike model of swift heavy ion–matter interactions via Pd 1−x Ni x /Si interface mixing journal January 2019

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