Measurement of radiation-enhanced diffusion of La in single crystal thin film CeO2

Pappas, Harrison K.; Heuser, Brent J.; Strehle, Melissa M.

doi:10.1016/j.jnucmat.2010.07.042

Cited by 8 publications

(13 citation statements)

References 14 publications

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“…Recent examples in the literature range from basic structural and fabrication studies 17,18 to exploration of irradiation behavior. [19][20][21] The valence states of U (4+, 5+, 6+) make Ce a poor surrogate from a fabrication and thermodynamic standpoint, but to date a comprehensive comparison of the thermophysical properties of stoichiometric CeO 2 and UO 2 has not been possible due to a lack of data for the former.…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of the Thermophysical Properties of Stoichiometric CeO₂ in Comparison to UO₂ and PuO₂

et al. 2014

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The thermal conductivity of stoichiometric CeO2 was determined through measurement of thermal expansion from 313 to 1723 K, thermal diffusivity from 298 to 1473 K, and specific heat capacity from 313 to 1373 K. The thermal conductivity was then calculated as the product of the density, thermal diffusivity, and specific heat capacity. The thermal conductivity was found to obey an (A + BT)−1 relationship with A = 6.776×10−2 m·K·W−1 and B = 2.793 × 10−4 m·W−1. Extrapolations of applied models were made to provide suggested data for the specific heat capacity, thermal diffusivity, and thermal conductivity data up to 1723 K. Results of thermal expansion and heat capacity measurements agreed well with the limited low‐temperature data available in the literature. The thermal conductivity values provided in the current study are significantly higher than the only high‐temperature data located for CeO2. This is attributed to the tendency of CeO2 to rapidly reduce at elevated temperatures given the available partial pressure of O2 in air at ambient pressure. The CeO2 data are compared to literature values for UO2 and PuO2 to evaluate its suitability as a surrogate in nuclear fuel systems where thermal transport is a primary criterion for performance

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Section: Introductionmentioning

confidence: 99%

An Evaluation of the Thermophysical Properties of Stoichiometric CeO₂ in Comparison to UO₂ and PuO₂

et al. 2014

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“…Thus, a modified model was developed to explain the results. A similar set of experiments was performed in CeO 2 with La as the tracer element on the cation sublattice by Pappas et al [10]. In the low temperature range, 400 -600 • C, the data were explained based on the recombinationlimited kinetics, however, rate-dependent (or flux-dependent) experiments in this temperature range has not been performed to confirm their conclusion.…”

Section: Introductionmentioning

confidence: 92%

“…However, the diffusion properties are different as demonstrated here. For example, no measurable diffusion coefficient has been reported below 1200 • C on uranium self-diffusion in UO 2 [11,12,13,14,15,16], whereas apparent diffusion has been found on the cation sublattice in CeO 2 [10]. Thus, it is necessary to perform a set of experiments to investigate the diffusion properties of the two materials under similar conditions.…”

Section: Introductionmentioning

confidence: 99%

Radiation enhanced diffusion of Nd in UO2

Han

Heuser

2015

Journal of Nuclear Materials

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Single crystal UO 2 thin films with Nd as tracer elements in the film mid-plane have been grown on yttria-stabilized zirconia (YSZ) substrates. The films were irradiated with 1.8 MeV Kr + ions in the temperature range from 400 • C to 1113 • C, where an evident enhanced diffusion was found in UO 2. The temperature dependent measurements have shown an activation energy of 0.56 ± 0.04 eV below 800 • C, and 1.9 ± 0.3 eV above 900 • C. The rate-dependent measurements have shown a linear dependence on the radiation flux, which indicates radiation enhanced diffusion (RED) is in the sink limited kinetics regime. Comparison of the RED results between UO 2 and CeO 2 has shown significant differences, which indicates that CeO 2 used as UO 2 surrogate may be questioned in terms of cation diffusion.

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“…Therefore, higher release rates can be expected from irradiated samples. The effect was experimentally investigated several times [39][40][41]. A crystal lattice repairs the produced defects [38] driven by self-diffusion.…”

Section: Calculationsmentioning

confidence: 99%

“…This self-healing is increased at higher temperatures. Hence, the RED acceleration decreases above θ ∼ 0.60 [39]. The data from Wittwer et al [16] and Beyer et al [14] were determined using irradiated samples while the data taken from the collection of Neumann [15] were determined conventionally.…”

Section: Calculationsmentioning

confidence: 99%

Prediction of the thermal release of transactinide elements (112 ≤Z≤ 116) from metals

Wittwer¹,

Dressler

Eichler³

et al. 2013

Radiochimica Acta

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Summary. Metallic catcher foils have been investigated on their thermal release capabilities for future superheavy element studies. These catcher materials shall serve as connection between production and chemical investigation of superheavy elements (SHE) at vacuum conditions. The diffusion constants and activation energies of diffusion have been extrapolated for various catcher materials using an atomic volume based model. Release rates can now be estimated for predefined experimental conditions using the determined diffusion values. The potential release behavior of the volatile SHE Cn (E112), E113, Fl (E114), E115, and Lv (E116) from polycrystalline, metallic foils of Ni, Y, Zr, Nb, Mo, Hf, Ta, and W is predicted. Example calculations showed that Zr is the best suited material in terms of on-line release efficiency and long-term operation stability. If higher temperatures up to 2773 K are applicable, tungsten is suggested to be the material of choice for such experiments.

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Measurement of radiation-enhanced diffusion of La in single crystal thin film CeO2

Cited by 8 publications

References 14 publications

An Evaluation of the Thermophysical Properties of Stoichiometric CeO₂ in Comparison to UO₂ and PuO₂

An Evaluation of the Thermophysical Properties of Stoichiometric CeO₂ in Comparison to UO₂ and PuO₂

Radiation enhanced diffusion of Nd in UO2

Prediction of the thermal release of transactinide elements (112 ≤Z≤ 116) from metals

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Measurement of radiation-enhanced diffusion of La in single crystal thin film CeO2

Cited by 8 publications

References 14 publications

An Evaluation of the Thermophysical Properties of Stoichiometric CeO2 in Comparison to UO2 and PuO2

An Evaluation of the Thermophysical Properties of Stoichiometric CeO2 in Comparison to UO2 and PuO2

Radiation enhanced diffusion of Nd in UO2

Prediction of the thermal release of transactinide elements (112 ≤Z≤ 116) from metals

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An Evaluation of the Thermophysical Properties of Stoichiometric CeO₂ in Comparison to UO₂ and PuO₂

An Evaluation of the Thermophysical Properties of Stoichiometric CeO₂ in Comparison to UO₂ and PuO₂