Solubility of helium in gold

Laakmann, J.; Jung, P.; Uelhoff, W.

doi:10.1016/0001-6160(87)90034-4

Cited by 57 publications

(22 citation statements)

References 11 publications

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“…In perfect crystalline metals, formation energies of He interstitials are close to self-interstitial formation energies 10,11 . Consequently, He solubility is below one part per trillion even near the melting temperature 12 . He therefore preferentially occupies high excess volume sites like vacancies and vacancy clusters.…”

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confidence: 98%

The effect of excess atomic volume on He bubble formation at fcc–bcc interfaces

Demkowicz

Bhattacharyya

Usov

et al. 2010

Applied Physics Letters

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Atomistic modeling shows that Cu-Nb and Cu-V interfaces contain high excess atomic volume due to constitutional vacancy concentrations of ~5%at. and ~0.8%at., respectively. This finding is supported by experiments demonstrating that a ~5-fold higher He concentration is required to observe He bubbles via throughfocus transmission electron microscopy at Cu-Nb interfaces than in Cu-V interfaces.Interfaces with structures tailored to minimize precipitation and growth of He bubbles may be used to design damage-resistant composites for fusion reactors.Unlike pure metals 1 , some materials contain constitutional vacancies that are thermodynamically stable at arbitrarily low temperature, for example grain boundaries (GBs) in ceramics 2 and semiconductors 3 , compounds with wide phase fields like NiAl 4 , and certain metal hydrides 5 . We use atomistic modeling to show that Cu-Nb and Cu-V interfaces contain high constitutional vacancy concentrations.Indirect experimental verification of this prediction is obtained by measuring the critical He concentration at which bubbles become detectable at these interfaces in transmission electron microscopy (TEM).

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confidence: 98%

The effect of excess atomic volume on He bubble formation at fcc–bcc interfaces

Demkowicz

Bhattacharyya

Usov

et al. 2010

Applied Physics Letters

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“…When implanted into solids, these particles rapidly come to rest, pick up two electrons, and become regular He atoms. Since He is a noble gas and does not bond with surrounding atoms, it usually has negligible solubility within solids [57]. Thus, it precipitates out of solution into nanometer-scale bubbles [58].…”

Section: He In Fcc/bcc Composites: Detecting Density Changesmentioning

confidence: 99%

Probing Interfaces in Metals Using Neutron Reflectometry

Demkowicz

Majewski

2016

Metals

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Solid-state interfaces play a major role in a variety of material properties. They are especially important in determining the behavior of nano-structured materials, such as metallic multilayers. However, interface structure and properties remain poorly understood, in part because the experimental toolbox for characterizing them is limited. Neutron reflectometry (NR) offers unique opportunities for studying interfaces in metals due to the high penetration depth of neutrons and the non-monotonic dependence of their scattering cross-sections on atomic numbers. We review the basic physics of NR and outline the advantages that this method offers for investigating interface behavior in metals, especially under extreme environments. We then present several example NR studies to illustrate these advantages and discuss avenues for expanding the use of NR within the metals community.

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“…Due to its extremely low solubility [8,9], He is not absorbed into metals from the environment. However, it may be introduced into metals in supersaturated form through nuclear transmutation [10] and decay [11] or through the direct implantation of highenergy He ions [12].…”

Section: Introductionmentioning

confidence: 99%

Imaging the in-plane distribution of helium precipitates at a Cu/V interface

Chen

Yuryev

et al. 2017

Materials Research Letters

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We describe a transmission electron microscopy investigation of the distribution of helium precipitates within the plane of an interface between Cu and V. Statistical analysis of precipitate locations reveals a weak tendency for interfacial precipitates to align along 110 -type crystallographic directions within the Cu layer. Comparison of these findings with helium-free Cu/V interfaces suggests that the precipitates may be aggregating preferentially along atomic-size steps in the interface created by threading dislocations in the Cu layer. Our observations also suggest that some precipitates may be aggregating along intersections between interfacial misfit dislocations. IMPACT STATEMENTThe innovation of this paper is providing the first plane-view experimental images of in-plane helium precipitate distributions at an interface between physical vapor deposited face-centered cubic (fcc) and body-centered cubic (bcc) metals. ARTICLE HISTORY

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Solubility of helium in gold

Cited by 57 publications

References 11 publications

The effect of excess atomic volume on He bubble formation at fcc–bcc interfaces

The effect of excess atomic volume on He bubble formation at fcc–bcc interfaces

Probing Interfaces in Metals Using Neutron Reflectometry

Imaging the in-plane distribution of helium precipitates at a Cu/V interface

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