Radiation damage in nanostructured materials

Zhang, Xinghang; Hattar, Khalid Mikhiel; Chen, Youxing; Shao, Lin; Li, Jin; Sun, Cheng; Kobayashi, Yu; Li, Nan; Taheri, Mitra L.; Wang, Haiyan; Wang, Jian; Nastasi, M.

doi:10.1016/j.pmatsci.2018.03.002

Cited by 357 publications

(145 citation statements)

References 656 publications

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“…Decades of work on metals have shown that grain boundaries and other interfaces can significantly influence point defect transport and annihilation, [ 14 ] motivating the use of engineered nanostructured materials to mediate disordering processes. [ 15–17 ] While irradiation‐induced structural disorder has been extensively studied in bulk pyrochlores, [ 7,12,18,19 ] less attention has been paid to the behavior of irradiated oxide thin film interfaces. Previous studies of epitaxial TiO 2 , [ 20,21 ] CeO 2 , [ 22,23 ] and BaTiO 3 [ 24 ] films on SrTiO 3 have shown evidence for the presence of denuded zones in some interface configurations and not in others; these variations have been attributed to differences in defect kinetics and energetics of the interface and its component elements.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Lattice Disorder Induced at Oxide Interfaces

Spurgeon

Kaspar

Shutthanandan

et al. 2020

Adv Materials Inter

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range of tunable functionalities, such as conductivity and magnetism, that result from non-equilibrium growth conditions, are distinct from the bulk, and are heavily influenced by lattice disorder. [1] Order-disorder phase transitions are particularly important in A 2 B 2 O 7 compounds (where A and B are transition metal cations), which have been studied for use in solid oxide fuel cells (SOFCs), [2][3][4] advanced ferroelectric sensors, [5,6] and nuclear waste forms. [7] These materials represent model systems in which to examine the fundamental relationship between the introduction of point defects and lattice disorder, which together govern behavior.In the bulk, A 2 B 2 O 7 compounds can exhibit a range of structures from defected fluorite ( 3 Fd m) to cubic pyrochlore ( 3 Fd m) and monoclinic perovskite-like layered structure (P2 1 ), as the cation radius ratio (r A /r B ) increases. [8] During thin film growth, additional kinetic and substrate constraints can further change the energy landscape of the system and the resultant phase distribution. [5,9] This structural flexibility allows the pyrochlores to preserve their overall crystallinity during disordering of the cation sublattice by external stimuli, such as electric fields and energetic ion bombardment, making them promising candidates for SOFCs and nuclear waste forms. [10][11][12] Recently, Kreller et al. [13] have shown that ion irradiation may be used to controllably manipulate anti-site defect populations and resulting ion conduction at a fundamental level. Building upon this approach, ion irradiation applied to thin film heterostructures represents a promising route to examine how interface geometry and configuration mediate the evolution of local order. Furthermore, characterization using aberrationcorrected scanning transmission electron microscopy can provide direct insight into defect formation that can be linked to models.Decades of work on metals have shown that grain boundaries and other interfaces can significantly influence point defect transport and annihilation, [14] motivating the use of engineered nanostructured materials to mediate disordering processes. [15][16][17] While irradiation-induced structural disorder has been extensively studied in bulk pyrochlores, [7,12,18,19] less attention has been paid to the behavior of irradiated oxide thin film interfaces. Previous studies of epitaxial TiO 2 , [20,21] CeO 2 , [22,23] and BaTiO 3[24] films on SrTiO 3 have shown evidence for the presence of denuded zones in some interface configurations and not in others; these variations have been attributed to differences in defect kinetics and energetics of the interface and its component elements. The interface charge state Control of order-disorder phase transitions is a fundamental materials science challenge, underpinning the development of energy storage technologies such as solid oxide fuel cells and batteries, ultra-high temperature ceramics, and durable nuclear waste forms. At present, the development of promising complex oxides for these...

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Section: Introductionmentioning

confidence: 99%

Asymmetric Lattice Disorder Induced at Oxide Interfaces

Spurgeon

Kaspar

Shutthanandan

et al. 2020

Adv Materials Inter

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“…For tungsten, where there is localized heating at the track, with large temperature gradients, single vacancies and di-vacancies are observed for the stopping power range considered here. According to the associated diffusivity values [57,58], these defects are expected to migrate to the surface and disappear, this would imply that nanowires are in fact radiation resistant in agreement with the radiation resistance present in nanofoams underkeV irradiation [61]. However, the large temperature gradients lead to a rapid ejection of atoms from the track, leading to changes in the topology of the wires.…”

Section: Summary and Future Outlooksmentioning

confidence: 81%

MeV irradiation of tungsten nanowires: structural modifications

Grossi

Kohanoff

Bringa

2020

Mater. Res. Express

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In this work we use the Two Temperature Model coupled to Molecular Dynamics (TTM-MD) to study swift heavy ion irradiation of W finite nanowires. Au projectiles are considered with energies ranging from 20 to 50 MeV, which correspond to electronic stopping values less than 20 keV nm −1 in the regime where electronic stopping is larger than nuclear stopping. Nanowires with diameters much smaller than the electron mean free path are considered for two different sizes with an aspect ratio ∼3.7 between length and diameter. Nanowires display radiation-induced surface roughening, sputtering yields and the formation of point defects and di-vacancies. For the smallest size, a hole stays opened in the central part of the wire for S e > 12.6 keV nm −1 . W nanofoams, considered as collections of connected nanowires like those simulated here, are expected to behave similarly under irradiation displaying radiation resistance for the electronic stopping range that has been considered. In fact, nanowires larger than tens of nm would be needed for defect accumulation and lack of radiation resistance.

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“…The low ability of CTBs to act as sinks for radiation‐induced defects has also been verified on the basis of computational simulations . However, some recent in situ studies revealed that twin boundaries can also show outstanding capability to act as sinks in irradiated nanotwinned metals . Yu et al observed that a large number of radiation‐induced stacking fault tetrahedra (SFTs) were removed during their interactions with abundant twin boundaries in nanotwinned Ag.…”

Section: Introductionmentioning

confidence: 94%

Atomistic Simulation of the Interaction Between Point Defects and Twin Boundary

Zhang

Shibuta

Lü

et al. 2018

Physica Status Solidi (b)

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While nanotwinned metals have been proven to show excellent mechanical properties, they are generally anticipated to be less effective in the alleviation of radiation damage. However, recent in situ studies have indicated that some nanotwinned metals exhibit unprecedented radiation tolerance, and the unexpected self‐healing of twin boundaries in response to radiation was observed. To reveal the underlying atomic mechanisms, we performed long‐time molecular dynamics simulations to study the dynamic interaction between twin boundary and some typical radiation‐induced point defects, including vacancy cluster and self‐interstitial atoms. The defective structures of coherent twin boundary which contains incoherent twin segment or self‐interstitial atoms are considered, and these structure features are found to effectively improve the ability of twin boundary to act as a sink for point defects.

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Radiation damage in nanostructured materials

Cited by 357 publications

References 656 publications

Asymmetric Lattice Disorder Induced at Oxide Interfaces

Asymmetric Lattice Disorder Induced at Oxide Interfaces

MeV irradiation of tungsten nanowires: structural modifications

Atomistic Simulation of the Interaction Between Point Defects and Twin Boundary

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