Why is magnesia spinel a radiation-resistant material?

Kinoshita, Chiken; Fukumoto, Ken-ichi; Fukuda, K.; Garner, F.А.; Hollenberg, G.W.

doi:10.1016/0022-3115(94)00388-2

Cited by 65 publications

(39 citation statements)

References 15 publications

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“…4,5 On the other hand, there is no clear evidence for the formation of extended defects such as dislocations loops or networks. 6 Such an inert matrix will be submitted to irradiation of different origins, namely fast neutrons, ␣ particles (∼6 MeV) and recoil atoms (∼240 amu, 100 keV) from natural actinides ␣-decay, fission products (∼80-150 amu, ∼70-100 MeV). 0955 These lead to different damage processes, small or large displacement cascades and electronic interactions.…”

Section: Introductionmentioning

confidence: 99%

Structural evolutions of spinels under ions irradiations

Gosset

Siméone

Dutheil

et al. 2005

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Structural evolutions of spinels under ions irradiations

Gosset

Siméone

Dutheil

et al. 2005

Journal of the European Ceramic Society

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“…Magnesium aluminate MgAl 2 O 4 spinel is a ceramic oxide that has demonstrated strong radiation resistance to amorphisation and to the formation of defect clusters and dislocation loops [1] [2]. Recent irradiation experiments conducted by Matsumura et al revealed disorder occurring over the cation sublattices, but the crystal structure remained stable in the damaged area [3] after 1 MeV Ne + irradiation to a dose of 4.5x10 20 ions/m 2 .…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics modelling of radiation damage in normal, partly inverse and inverse spinels

Bacorisen

Smith

Ball

et al. 2006

Nuclear Instruments and Methods in Physics Research Section B:

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The radiation response of perfect crystals of MgAl 2 O 4 , partially inverted MgGa 2 O 4 and fully inverse MgIn 2 O 4 were investigated using molecular dynamics. Dynamical cascades were initiated in these spinels over a range of trajectories with energies of 400 eV and 2 keV for the primary knock-on event. Collision cascades were set up on each of the cation and anion sublattices and were monitored up to 10 ps. Simulations in the normal MgAl 2 O 4 spinel for the 2 keV energy regime resulted in similar defect structures as obtained at the post-threshold 400 eV energies, with little clustering occurring. The predominant defect configurations were split interstitials and cation antisites. For the inverse spinels, a much wider variety of lattice imperfections was observed. More defects were also produced due to the formation of interstitialvacancy cation chains and oxygen crowdions.

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“…Conversely, when the migration energy is small, the average loop size predicted by the model becomes quite large, almost 100 nm in diameter, unless the maximum size of interstitial loops is limited (as indicated by ''arrested'') to be comparable to the experimental observations. In MgAl 2 O 4 , interstitial loops are found to grow only to a maximum size as they are faulted loops and the fault energy results in an energetic penalty for further growth [39].…”

Section: Modelingmentioning

confidence: 99%

Resilient ZnO nanowires in an irradiation environment: An in situ study

et al. 2015

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a b s t r a c tZnO nanowires (NWs) have been extensively studied for various device applications. Although these nanowires are often suspected to be impractical and highly unstable under hostile radiation environments, to date little is known on their radiation tolerance. Here, we show outstanding resilience of ZnO NWs by using in situ Kr ion irradiation at room temperature inside a transmission electron microscope. Our studies show that ZnO nanowires with certain diameters become nearly immune to radiation damage due to the existence of dislocation loop denuded zones. A remarkable size effect also holds: the smaller the nanowire diameter, the lower the defect density. Rate theory modeling suggests that the size effect arises from fast interstitial migration and a limit in size to which interstitial loops can grow. In situ studies also revealed a surprising phenomenon: the pristine prismatic loops can prevail over the strongest known defect sinks, free surfaces, to trap radiation-induced defect clusters. This study comprises the first critical step toward in-depth understanding of radiation response of functional oxide nanowires for electronic device applications in extreme environments.

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Why is magnesia spinel a radiation-resistant material?

Cited by 65 publications

References 15 publications

Structural evolutions of spinels under ions irradiations

Structural evolutions of spinels under ions irradiations

Molecular dynamics modelling of radiation damage in normal, partly inverse and inverse spinels

Resilient ZnO nanowires in an irradiation environment: An in situ study

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