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Annealing of radiation-induced defects in tungsten: Positron annihilation spectroscopy study

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dc.contributor.authorTerentyev, D.
dc.contributor.authorFuntikov, Y. V.
dc.contributor.authorStolbunov, V. S.
dc.contributor.authorOgorodnikova, O. V.
dc.contributor.authorDubov, L. Y.
dc.contributor.authorStepanov, S. V.
dc.contributor.authorShtotsky, Y. V.
dc.contributor.authorEfimov, V.
dc.contributor.authorGutorov, K.
dc.contributor.authorОгородникова, Ольга Вячеславовна
dc.contributor.authorДубов, Леонид Юрьевич
dc.contributor.authorСтепанов, Сергей Всеволодович
dc.contributor.authorШтоцкий, Юрий Владимирович
dc.contributor.authorЕфимов, Виталий Сергеевич
dc.contributor.authorГуторов, Константин Михайлович
dc.date.accessioned2024-11-20T09:37:10Z
dc.date.available2024-11-20T09:37:10Z
dc.date.issued2019
dc.description.abstract© 2019 Elsevier B.V. Positron annihilation lifetime spectroscopy (PALS) was applied to study the annealing of radiation-induced defects in polycrystalline tungsten (W) irradiated with 21.6 MeV protons at 100 °C up to a fluence of 5 × 10 15 p/cm 2 . Three components were observed in the measured spectra: short-lifetime of 100–120 ps (positron annihilation in the defect-free W lattice), medium-lifetime of ∼190–330 ps (annihilation at mono-vacancies and small vacancy cluster containing ∼ 2–4 vacancies) and long-lifetime of ∼500 ps (annihilation in large vacancy clusters containing more than 10 vacancies). The irradiation of W with protons at 100 °C, primary, led to the formation of mono-vacancies, self-interstitial defects were created as well but migrated towards sinks during the irradiation. Onset of vacancy diffusion in W starts already at 200 °C before defect recovery stage III. After annealing at ∼400 °C, a sharp drop in the intensity of the positron medium-life component together with a simultaneous increase in positron lifetime from ∼220 to ∼280 ps is observed, and a long-life component appears. This indicates migration and annealing of vacancies and their agglomeration in large vacancy clusters. After annealing at 500–700C, the intensity of long-life component increases indicating the growth of large vacancy clusters but at 900 °C they anneal completely as the mean lifetime recovers nearly to the value measured in the un-irradiated material.
dc.format.extentС. 148-151
dc.identifier.citationAnnealing of radiation-induced defects in tungsten: Positron annihilation spectroscopy study / Terentyev, D. [et al.] // Journal of Nuclear Materials. - 2019. - 517. - P. 148-151. - 10.1016/j.jnucmat.2019.02.010
dc.identifier.doi10.1016/j.jnucmat.2019.02.010
dc.identifier.urihttps://www.doi.org/10.1016/j.jnucmat.2019.02.010
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dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000461048800016
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/16575
dc.relation.ispartofJournal of Nuclear Materials
dc.titleAnnealing of radiation-induced defects in tungsten: Positron annihilation spectroscopy study
dc.typeArticle
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oaire.citation.volume517
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