Temperature dependence of He trapping in niobium

Roth, J.; Picraux, S. T.; Eckstein, W.; Bøttiger, J.; Behrisch, R.

doi:10.1016/0022-3115(76)90313-5

Cited by 33 publications

(7 citation statements)

References 13 publications

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“…A similar behavior was already encountered in the case of yttria-stabilized zirconia (YSZ, ZrO 2 :Y) [14], and some metals like Ta [31] or Nb [32], in which helium is also quite strongly trapped in (He n -V m ) clusters near the EOR zone up to high temperatures for RT ion implantations. A much lower amount of helium is retained when implantations are performed at high temperatures [24,32].…”

Section: Discussionmentioning

confidence: 51%

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Nuclear reaction analysis of helium migration in silicon carbide

Miro

Costantini

Haussy

et al. 2011

Journal of Nuclear Materials

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Section: Discussionmentioning

confidence: 51%

“…A much lower amount of helium is retained when implantations are performed at high temperatures [24,32]. In the case of YSZ, helium escapes out of the profile above 800°C, with almost complete out gassing at 1100°C.…”

Section: Discussionmentioning

confidence: 96%

Nuclear reaction analysis of helium migration in silicon carbide

Miro

Costantini

Haussy

et al. 2011

Journal of Nuclear Materials

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“…While W is the most widely studied material in this field (due to the relevance of He + ion irradiation damage to fusion applications), high-flux, low-energy He + ion irradiation has been known to produce various types of nanostructures in other materials such as nano-pillars and pinholes in Ti [21][22], nano-tendrils in Mo [23][24], voids and pinholes in Ta [25], and other void and nanostructure formations in Cu and Al [22]. We present He + ion irradiation as a novel processing technique; however, the effects of He + ion irradiation on Nb surfaces have previously been studied in the context of nuclear structural materials to assess Nb as a potential plasma-facing component (PFC) for nuclear fusion reactors [26][27][28][29][30]. In these studies, He bubble formation [26][27][28], surface blistering [29], and tendril-like structures [30] are observed as a result of He + ion induced surface modification.…”

Section: Introductionmentioning

confidence: 99%

“…We present He + ion irradiation as a novel processing technique; however, the effects of He + ion irradiation on Nb surfaces have previously been studied in the context of nuclear structural materials to assess Nb as a potential plasma-facing component (PFC) for nuclear fusion reactors [26][27][28][29][30]. In these studies, He bubble formation [26][27][28], surface blistering [29], and tendril-like structures [30] are observed as a result of He + ion induced surface modification. However, almost all of these studies use relatively higher He + ion energies (up to several keV) where sputtering also plays an important role.…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent surface porosity of Nb2O5 under high-flux, low-energy He+ ion irradiation

Novakowski

Tripathi

Hosinski

et al. 2016

Applied Surface Science

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The present study reports on high-flux, low-energy He + ion irradiation as a novel method of enhancing the surface porosity and surface area of naturally oxidized niobium (Nb). Our study shows that ion-irradiation-induced Nb surface micro-and nano-structures are highly tunable by varying the target temperature during ion bombardment. Mirrorpolished Nb samples were irradiated with 100 eV He + ions at a flux of 1.2×10 21 ions m-2 s-1 to a total fluence of 4.3×10 24 ions m-2 with simultaneous sample annealing in the temperature range of 773-1223 K to demonstrate the influence of sample temperature on the resulting Nb surface morphology. This surface morphology was primarily characterized using field-emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM). Below 923 K, Nb surfaces form nano-scale tendrils and exhibit significant increases in surface porosity. Above 923 K, homogeneously populated nano-pores with an average diameter of ~60 nm are observed in addition to a smaller population of sub-micron sized pores (up to ~230 nm in diameter). Our analysis shows a significant reduction in surface pore number density and surface porosity with increasing sample temperature. High-resolution ex-situ X-ray photoelectron spectroscopy (XPS) shows Nb 2 O 5 phase in all of the ion-irradiated samples. To further demonstrate the length scales in which radiation-induced surface roughening occurs,

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“…2 such broadening did not occur. Others have reported that the helium behavior in crystalline metals or alloys is likewise controlled by a pure detrappmg mechanism [14][15][16].…”

Section: Methodsmentioning

confidence: 99%

Range profiles and thermal release of 3He implanted into various nickel-based amorphous alloys

Ünlü

Vincent

1990

Nuclear Instruments and Methods in Physics Research Section A:

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The behavior of 3 He in the amorphous alloys Ni751Cr]4P1o1Coos, Ni635Zr365 and Nis77P123 is investigated. The samples were implanted with 150 keV 3He ions with doses of 1 x 10 16 and 5 X 1016 3He/cm2. The samples were isochronally annealed at several consecutive stages up to their crystallization temperatures. After each annealing stage, 3 He depth profiles were measured by a thermal-neutron-induced nuclear-reaction technique called neutron depth profiling (NDP). The maximum 3He release (-20%) was observed for the Ni 635Zr365 sample and it occurred before crystallization. Smaller but measurable amounts of 3He were released from most other combinations of sample material and implant doses The 3He release that we observed is controlled by a detrapping process, and there are indications that it is dependent on the implantation dose. In addition to 3He release measurements, our study yielded a determination of projected depths of 3He ions with an initial energy of 150 keV in the alloys studied. The most probable range values are: 320±21 rim for N1751Cr14P1o ICoos, 378±34 rim for Ni 635Zr365 and 375 f29 nm for N1 87 7P12 3 ,

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Temperature dependence of He trapping in niobium

Cited by 33 publications

References 13 publications

Nuclear reaction analysis of helium migration in silicon carbide

Nuclear reaction analysis of helium migration in silicon carbide

Temperature-dependent surface porosity of Nb2O5 under high-flux, low-energy He+ ion irradiation

Range profiles and thermal release of 3He implanted into various nickel-based amorphous alloys

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