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Structure and bulk modulus of Ln-doped UO2 (Ln = La, Nd) at high pressure

Journal Article · · Journal of Nuclear Materials
 [1];  [1];  [1];  [2];  [3];  [3];  [2];  [4];  [1]
  1. Stanford Univ., Stanford, CA (United States)
  2. Univ. of California, Davis, CA (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
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The structure of lanthanide-doped uranium dioxide, LnxU1-xO2-0.5x+y (Ln = La, Nd), was investigated at pressures up to ~50–55 GPa. Samples were synthesized with different lanthanides at different concentrations (x ~ 0.2 and 0.5), and all were slightly hyperstoichiometric (y ~ 0.25–0.4). In situ high-pressure synchrotron X-ray diffraction was used to investigate their high-pressure phase behavior and determine their bulk moduli. All samples underwent a fluorite-to-cotunnite phase transformation with increasing pressure. The pressure of the phase transformation increased with increasing hyperstoichiometry, which is consistent with results from previous computational simulations. Bulk moduli are inversely proportional to both the ionic radius of the lanthanide and its concentration, as quantified using a weighted cationic radius ratio. As a result, this trend was found to be consistent with the behavior of other elastic properties measured for Ln-doped UO2, such as Young's modulus.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-76SF00515; SC0001089; NA0001974; FG02-99ER45775; AC02-05CH11231; NA0002006
OSTI ID:
1369255
Alternate ID(s):
OSTI ID: 1419350
OSTI ID: 1357632
OSTI ID: 22689038
Journal Information:
Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: C Vol. 490; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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