TEM investigation of irradiation damage in single crystal CeO2

Ye, Bei; Kirk, Mark A.; Chen, Wei‐Ying; Oaks, Aaron; Rest, J.; Yacout, Abdellatif M.; Stubbins, James F.

doi:10.1016/j.jnucmat.2011.03.052

Cited by 35 publications

(25 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the migration energy of the Ce vacancy has been estimated experimentally to be 2.3 eV [11] and calculated to be 5.3 eV [19]. Based on these activation energies and the observation [11] that the Ce vacancy is essential immobile below 675 K, it seems improbable that the Ce vacancy is mobile at the temperatures in either this study or the work of Ye et al [28]. On the other hand, the oxygen vacancy in CeO 2 has a measured and calculated migration energy of 0.52 eV [19], and the migration energy of the oxygen interstitial has been experimentally estimated to be 1.8 eV [11] and calculated to be 1.13 eV [19].…”

Section: Grain Growth and Grain Boundary Evolutionmentioning

confidence: 61%

“…This transition occurs at a faster rate for the 300 K irradiation in comparison to that at 400 K. This is attributed to the growth of dislocations during the irradiation at 400 K. It is well known that dislocations readily form in ion-irradiated ceria. In experiments on single crystal CeO 2 , it was observed that at lower irradiation temperatures higher densities of smaller dislocations were formed, whereas a lower density of larger dislocations was produced at higher temperatures [28]. This change in dislocation size at different temperatures was attributed to the Ce vacancy mobility.…”

Section: Grain Growth and Grain Boundary Evolutionmentioning

confidence: 97%

See 1 more Smart Citation

Irradiation effects on microstructure change in nanocrystalline ceria – Phase, lattice stress, grain size and boundaries

et al. 2012

View full text Add to dashboard Cite

Moll, S.; Namavar, F.; and Weber, W.J., "Irradiation effects on microstructure change in nanocrystalline ceria -Phase, lattice stress, grain size and boundaries" (2012 AbstractWith a wide variety of applications in numerous industries, ranging from biomedical to nuclear, ceramics such as ceria are key engineering materials. It is possible to significantly alter the materials functionality and therefore its applications by reducing the grain size to the nanometer size regime, at which point the unique varieties of grain boundaries and associated interfaces begin to dominate the material properties. Nanocrystalline films of cubic ceria deposited onto Si substrates have been irradiated with 3 MeV Au + ions at temperatures of 300 and 400 K to evaluate their response to irradiation. It was observed that the films remained phase stable. Following a slight stress relief stage at low damage levels, the overall lattice is extremely stable up to high irradiation dose of $34 displacements per atom. The grains were also observed to undergo a temperature-dependent grain growth process upon ion irradiation. This is attributed to a defect-driven mechanism in which the diffusion of defects from the collision cascade is critical. Formation of dislocations that terminate and stabilize at symmetric grain boundaries may be the limiting factor in the grain growth and overall energy reduction of the system. Utilizing ion modification, possible improvement of the adhesion of thin films and reduction of the probability of detrimental effects of stress-induced problems are discussed.

show abstract

Section: Grain Growth and Grain Boundary Evolutionmentioning

confidence: 61%

Section: Grain Growth and Grain Boundary Evolutionmentioning

confidence: 97%

Irradiation effects on microstructure change in nanocrystalline ceria – Phase, lattice stress, grain size and boundaries

et al. 2012

View full text Add to dashboard Cite

show abstract

“…UO 2 for use in experimental studies can pose difficulties due to its radioactive nature. Cerium dioxide (CeO 2 ) is chosen as a non-radioactive surrogate for UO 2 in many studies due to their similar crystal structure and physical properties [6][7][8][9][10][11][12]. In addition, a recent molecular dynamics (MD) study carried out by Aidhy et al shows that irradiated CeO 2 and UO 2 form similar interstitial clusters when temperatures for each system are selected correctly [13].…”

Section: Introductionmentioning

confidence: 99%

“…Ye et al observed the formation and growth of dislocation loops in CeO 2 under energetic Kr ion irradiations [11]. However, loop properties such as habit plane, Burgers vector and nature (extrinsic or intrinsic) are not yet characterized thoroughly.…”

Section: Introductionmentioning

confidence: 99%

Characterization of dislocation loops in CeO₂irradiated with high energy Krypton and Xenon

Chen

Wen

Kirk

et al. 2013

Philosophical Magazine

Self Cite

View full text Add to dashboard Cite

In order to fully characterize the structure of dislocation loops in CeO 2 , ion irradiations have been performed at 800°C on CeO 2 single-crystal thin films individually using 1 MeV Kr ions and 150 keV Xe ions, both to a dose of 5 Â 10 14 ions/cm 2 . Post-irradiation TEM examination, diffraction contrast imaging and high-resolution transmission electron microscopy (HRTEM), has confirmed that the irradiation-induced dislocation loops in CeO 2 were Frank loops, having an interstitial nature with {1 1 1} habit planes and a 1/3h1 1 1i Burgers vector. Dislocation loops were confirmed to be a stacking fault in nature through TEM observations of the interference fringes inside the loop periphery.

show abstract

“…However in this case, due to a significantly higher irradiation temperature, the reduction is expected to be due to extended defects. 58,59 Irradiation damage was characterized using transmission electron microscopy (TEM). Figure 3(b) shows representative TEM micrographs which clearly reveal the presence of irradiation induced dislocation loops in both samples.…”

Section: B Impact Of Dislocation Loops On Thermal Conductivitymentioning

confidence: 99%

Investigation of thermal transport in composites and ion beam irradiated materials for nuclear energy applications

et al. 2016

View full text Add to dashboard Cite

Thermal transport in materials used for energy applications is a physical process directly tied to performance and reliability. As a result, a great deal of effort has been devoted to understanding thermal transport in materials whose ability to conduct heat is critical. Here, our objective is to discuss the utility of laser-based thermoreflectance (TR) approaches that provide microscale measurement of thermal transport. We provide several examples that implement the TR technique to investigate thermal transport in materials used in nuclear energy applications. First, we discuss utility of this technique to measure thermal conductivity in ion irradiated ceramic materials during investigations where the primary objective is to understand the impact of radiation induced crystalline structure defects on thermal transport. We also present the capability of TR approach to resolve thermal conductivity of each layer in tristructural isotropic fuel, silicon carbide fiber composites, and 2nd phase precipitates in uranium silicide. Finally, the ability to measure interface thermal resistance between adjacent layers in composites is demonstrated.

show abstract

TEM investigation of irradiation damage in single crystal CeO2

Cited by 35 publications

References 26 publications

Irradiation effects on microstructure change in nanocrystalline ceria – Phase, lattice stress, grain size and boundaries

Irradiation effects on microstructure change in nanocrystalline ceria – Phase, lattice stress, grain size and boundaries

Characterization of dislocation loops in CeO₂irradiated with high energy Krypton and Xenon

Investigation of thermal transport in composites and ion beam irradiated materials for nuclear energy applications

Contact Info

Product

Resources

About

TEM investigation of irradiation damage in single crystal CeO2

Cited by 35 publications

References 26 publications

Irradiation effects on microstructure change in nanocrystalline ceria – Phase, lattice stress, grain size and boundaries

Irradiation effects on microstructure change in nanocrystalline ceria – Phase, lattice stress, grain size and boundaries

Characterization of dislocation loops in CeO2irradiated with high energy Krypton and Xenon

Investigation of thermal transport in composites and ion beam irradiated materials for nuclear energy applications

Contact Info

Product

Resources

About

Characterization of dislocation loops in CeO₂irradiated with high energy Krypton and Xenon