Structural modification of nanocrystalline ceria by ion beams

Zhang, Yongfeng; Edmondson, Philip D.; Varga, Tamás; Moll, S.; Namavar, F.; Lan, Chune; Weber, William J.

doi:10.1039/c1cp21335k

Cited by 58 publications

(60 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The parameters used for the simulations were a sample density of $6.3 g cm À3 , with threshold displacement energies of 27 and 56 eV for the O and Ce atoms respectively [19,20]. This gave an average fluence-to-dpa conversion factor of 0.54 dpa per 10 14 ions cm À2 [21]. Post-irradiation characterization was performed using the complementary techniques of Rutherford backscattering spectroscopy (RBS), transmission electron microscopy (TEM) and glancing incidence X-ray diffraction (GIXRD).…”

Section: Experimental Methodsmentioning

confidence: 99%

“…7, where it can easily be seen that the grains undergo a rapid growth at low dpa levels before beginning to stabilize somewhat at higher dpa levels. Indeed, increasing the dose further (to a value of 108 dpa) results in additional growth of the grain size to an asymptotic value of $25 nm [21]. Previous work has shown that grain growth of nanocrystalline metallic systems under irradiation [25] follows the equation D n À D n 0 ¼ kUt, where n = 3, D is the grain size for a given dose, D 0 is the initial grain size, K is a constant and Ut is the ion dose.…”

Section: Grain Growth and Grain Boundary Evolutionmentioning

confidence: 99%

“…This suggests that there is a different grain growth mechanism occurring in nanocrystalline ceramics (ceria and zirconia). It has been proposed that a defect-stimulated grain growth mechanism is the dominant process in nanocrystalline ceramics under irradiation [15,21], with the diffusion of the defects to the grain boundaries playing a vital role -as discussed above. While it would normally be expected that grain growth should not occur in ceramics at these temperatures, the nanocrystalline morphology of the samples, coupled with the potential for a non-equilibrium concentration of defects that may be present in the sample due to the synthesis process, could result in thermally induced grain growth.…”

Section: Grain Growth and Grain Boundary Evolutionmentioning

confidence: 99%

“…Previous work has shown that grain growth of nanocrystalline metallic systems under irradiation [25] follows the equation D n À D n 0 ¼ kUt, where n = 3, D is the grain size for a given dose, D 0 is the initial grain size, K is a constant and Ut is the ion dose. For nanocrystalline ceramic films, it has been shown that the exponent, n, does not equal 3 [15,21]; nor does it equal 2 -a value assigned for thermal growth of nanocrystalline metallic grains. This suggests that there is a different grain growth mechanism occurring in nanocrystalline ceramics (ceria and zirconia).…”

Section: Grain Growth and Grain Boundary Evolutionmentioning

confidence: 99%

See 3 more Smart Citations

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: Experimental Methodsmentioning

confidence: 99%

Section: Grain Growth and Grain Boundary Evolutionmentioning

confidence: 99%

Section: Grain Growth and Grain Boundary Evolutionmentioning

confidence: 99%

Section: Grain Growth and Grain Boundary Evolutionmentioning

confidence: 99%

See 2 more Smart Citations

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

“…Synergistic effects 28 56 (E < 0.5 MeV), the transfer of energy to atomic nuclei (nuclear 57 energy loss) dominates, leading to the displacement of atoms via 58 elastic scattering collisions between atomic nuclei in ballistic colli- 59 sion cascades. For high energy ions exceeding $1 MeV per nucleon 60 (MeV/u), particularly for swift heavy ions (E > 50 MeV), electronic 61 energy loss dominates, leading to intense local ionization that 62 can cause damage production [6], track formation [7] or damage 63 recovery [8], and the formation of long, straight ion tracks with 64 nanometer diameters by swift heavy ions has been exploited in a 65 range of nanoscience applications [9,10].…”

mentioning

confidence: 99%

The role of electronic energy loss in ion beam modification of materials

Weber

Duffy

Thomé

et al. 2015

Current Opinion in Solid State and Materials Science

Self Cite

170

View full text Add to dashboard Cite

nuclear energy loss 24 Two-temperature model 25 Thermal spike model 26 Ion annealing 27 Synergistic effects 28 2 9 a b s t r a c t 30 The interaction of energetic ions with solids results in energy loss to both atomic nuclei and electrons in 31 the solid. In this article, recent advances in understanding and modeling the additive and competitive 32 effects of nuclear and electronic energy loss on the response of materials to ion irradiation are reviewed. 33 Experimental methods and large-scale atomistic simulations are used to study the separate and com-34 bined effects of nuclear and electronic energy loss on ion beam modification of materials. The results 35 demonstrate that nuclear and electronic energy loss can lead to additive effects on irradiation damage 36 production in some materials; while in other materials, the competitive effects of electronic energy loss 37 leads to recovery of damage induced by elastic collision cascades. These results have significant implica-38 tions for ion beam modification of materials, non-thermal recovery of ion implantation damage, and the 39 response of materials to extreme radiation environments.40

show abstract

Giant Radiolytic Dissolution Rates of Aqueous Ceria Observed in Situ by Liquid‐Cell TEM

2017

View full text Add to dashboard Cite

The dynamics of cerium oxide nanoparticle aqueous corrosion are revealed in situ. We use innovative liquid-cell transmission electron microscopy (TEM) combined with deliberate high-intensity electron-beam irradiation of nanoparticle suspensions. This enables life video-recording of materials reactions in liquid, with nm resolution. We introduce image quantification to measure detailed rates of dissolution as a function of time and particle size to be compared with literature data. Giant dissolution rates, exceeding any previous reports for chemical dissolution rates at room temperature by many orders of magnitude, are discovered. The reasons for this accelerated dissolution are outlined, including the importance of the radiolysis of water preceding the ceria attack. Electron-water interaction generates radicals, ions, and hydrated electrons, which assist in hydration and reductive dissolution of oxide minerals. The presented methodology has the potential to become a novel accelerated testing procedure to compare multiple nanoscale materials for relative aqueous durability. The ceria-water system is of crucial importance for the fields of catalysis, abrasive polishing, environmental remediation, and as simulant for actinide oxide behaviour in contact with liquid for nuclear engineering.

show abstract

Structural modification of nanocrystalline ceria by ion beams

Cited by 58 publications

References 35 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

The role of electronic energy loss in ion beam modification of materials

Giant Radiolytic Dissolution Rates of Aqueous Ceria Observed in Situ by Liquid‐Cell TEM

Contact Info

Product

Resources

About