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

Journal Article · · Physics and Chemistry of Minerals
 [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)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1261332
Journal Information:
Physics and Chemistry of Minerals, Journal Name: Physics and Chemistry of Minerals; ISSN 0342-1791
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (3)

Mechanical and structural properties of radiation-damaged allanite-(Ce) and the effects of thermal annealing journal August 2019
Radiation-damage-induced transitions in zircon: Percolation theory applied to hardness and elastic moduli as a function of density journal May 2018
Mechanical and structural properties of radiation-damaged allanite-(Ce) and the effects of thermal annealing text January 2019

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