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Title: Anisotropic mechanical properties of zircon and the effect of radiation damage

Our study provides new insights into the relationship between radiation-dose-dependent structural damage, due to natural U and Th impurities, and the anisotropic mechanical properties (Poisson s ratio, elastic modulus and hardness) of zircon. Natural zircon samples from Sri Lanka (see Muarakami et al. 1991) and synthetic samples, covering a dose range of zero up to 6.8 x 10 18 -decays/g, have been studied by nanoindentation. Measurements along the [100] crystallographic direction and calculations, based on elastic stiffness constants determined by zkan (1976), revealed a general radiation-induced decrease in stiffness (~ 54 %) and hardness (~ 48 %) and an increase of the Poisson s ratio (~ 54 %) with increasing dose. Additional indentations on selected samples along the [001] allowed one to follow the amorphization process to the point that the mechanical properties are isotropic. This work shows that the radiation-dose-dependent changes of the mechanical properties of zircon can be directly correlated with the amorphous fraction as determined by previous investigations with local and global probes (Rios et al. 2000a; Farnan and Salje 2001; Zhang and Salje 2001). This agreement, revealed by the different methods, indicates a huge influence of structural and even local phenomena on the macroscopic mechanical properties.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [2]
  1. Stanford Univ., CA (United States); Univ. of Hamburg (Germany)
  2. Stanford Univ., CA (United States)
  3. Univ. of Hamburg (Germany)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physics and Chemistry of Minerals
Additional Journal Information:
Journal Name: Physics and Chemistry of Minerals; Journal ID: ISSN 0342-1791
Publisher:
Springer
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; zircon; radiation damage; alpha-decay; metamictization; nanoindentation; mechanical properties
OSTI Identifier:
1261332

Beirau, Tobias, Nix, William D., Bismayer, Ulrich, Boatner, Lynn A., Isaacson, Scott G., and Ewing, Rodney C.. Anisotropic mechanical properties of zircon and the effect of radiation damage. United States: N. p., Web. doi:10.1007/s00269-016-0822-9.
Beirau, Tobias, Nix, William D., Bismayer, Ulrich, Boatner, Lynn A., Isaacson, Scott G., & Ewing, Rodney C.. Anisotropic mechanical properties of zircon and the effect of radiation damage. United States. doi:10.1007/s00269-016-0822-9.
Beirau, Tobias, Nix, William D., Bismayer, Ulrich, Boatner, Lynn A., Isaacson, Scott G., and Ewing, Rodney C.. 2016. "Anisotropic mechanical properties of zircon and the effect of radiation damage". United States. doi:10.1007/s00269-016-0822-9. https://www.osti.gov/servlets/purl/1261332.
@article{osti_1261332,
title = {Anisotropic mechanical properties of zircon and the effect of radiation damage},
author = {Beirau, Tobias and Nix, William D. and Bismayer, Ulrich and Boatner, Lynn A. and Isaacson, Scott G. and Ewing, Rodney C.},
abstractNote = {Our study provides new insights into the relationship between radiation-dose-dependent structural damage, due to natural U and Th impurities, and the anisotropic mechanical properties (Poisson s ratio, elastic modulus and hardness) of zircon. Natural zircon samples from Sri Lanka (see Muarakami et al. 1991) and synthetic samples, covering a dose range of zero up to 6.8 x 1018 -decays/g, have been studied by nanoindentation. Measurements along the [100] crystallographic direction and calculations, based on elastic stiffness constants determined by zkan (1976), revealed a general radiation-induced decrease in stiffness (~ 54 %) and hardness (~ 48 %) and an increase of the Poisson s ratio (~ 54 %) with increasing dose. Additional indentations on selected samples along the [001] allowed one to follow the amorphization process to the point that the mechanical properties are isotropic. This work shows that the radiation-dose-dependent changes of the mechanical properties of zircon can be directly correlated with the amorphous fraction as determined by previous investigations with local and global probes (Rios et al. 2000a; Farnan and Salje 2001; Zhang and Salje 2001). This agreement, revealed by the different methods, indicates a huge influence of structural and even local phenomena on the macroscopic mechanical properties.},
doi = {10.1007/s00269-016-0822-9},
journal = {Physics and Chemistry of Minerals},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {6}
}