The recovery of electron irradiated zinc and cadmium by positron annihilation spectroscopy

Hidalgo, C.; Diego, N. de; Moser, P.

doi:10.1007/bf00616587

Cited by 15 publications

(3 citation statements)

References 18 publications

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“…These results are qualitatively in agreement with the previous works of Hansen et al [2] and Khanna et al [4] for Mo; however, at least an atomic relaxation of -3% in the first neighbours is required to observe noticeable changes in the lifetime of a monovacancy in Mo. Our calculated values for Zn are in good agreement with the experimental lifetime value associated to monovacancies measured in electron irradiated Zn, τ=220ps, [22] demonstrating that the atomic relaxation around a monovacancy predicted by the potential model is enough to explain the positron experiments.…”

Section: Resultssupporting

confidence: 93%

“…The comparison of the present data for positron lifetimes of defects in Zn with experimental positron measurements on electron-irradiated Zn [22] allows us unambiguously to rule out the formation of three-dimensional vacancy clusters. Moreover, in the light of the present results, we can interpret the residual trapping signal observed after annealing to positron trapping at interstitial-type loops.…”

Section: Resultsmentioning

confidence: 54%

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Positron lifetime calculations for defects in Zn

Campillo

Plazaola²,

Diego

2000

J. Phys.: Condens. Matter

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The effect of the lattice relaxation at vacancy clusters and interstitial-type dislocation loops on the lifetime of positrons in Zn has been studied. Defective relaxed structures have been generated for the lifetime calculations by using a many-body potential for Zn. From the results, it is inferred that the effect of the atomic relaxation is mainly significant for small vacancy clusters. The lifetime associated with interstitial-type loops is very sensitive to the loop structure and its surroundings. Previous experimental results are compared with the theoretical calculations.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 54%

Positron lifetime calculations for defects in Zn

Campillo

Plazaola²,

Diego

2000

J. Phys.: Condens. Matter

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“…This value shows that the cadmium specimen is not defect-free, as in that case the positron lifetime should be around 0.184 ns. In literature, mean positron lifetimes in Cd specimens in the range from 0.16 to 0.25 ns have been reported at temperatures from 100 to 600 K [9][10][11][12].…”

Section: Resultsmentioning

confidence: 99%

Positron Annihilation Lifetime Spectroscopy in the study of defects in materials

Triantou

Mergia

Stamatelatos

2019

hnps

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The Positron Annihilation Lifetime Spectroscopy (PALS) is a valuable method for the study of the open volume defects in materials. The reduced electron density at the vacant/defect site increases the positron lifetime, and positron lifetime increases as the size of defect increases. In the current paper the experimental apparatus for the measurement of the positron lifetime in materials is described and the spectra from W and Cd specimens are analyzed. The presence of dislocations and vacancy defects is found, since the positron lifetimes of specimens are higher than the defect-free (bulk) values.

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Positron-Dislocation Interaction in Deformed Zn and Cd

Hidalgo

Linderoth

Diego

1987

Phys. Stat. Sol. (a)

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The evolution of the positron lifetime parameters with temperature is studied in deformed Zn and Cd in the temperature range 12 to 210 K. The presence of a trapping component with a lifetime of 230ps in Zn and250ps in Cd was observed. The intensity of the long component decrease drastically with increasing temperature These results are discussed in the framework of the trapping model for dislocations in which it is assumed indirect positron trapping into deep traps (jogs orland vacancies) through shallow traps(dis1ocation line). From the experimental results i t is snggested that detrapping processes from dislocation lines take place above 120 K i n both, Zn and Cd. Die Bnderung der Positronenlebensdauerparameter wird in verformten Zn und Cd im Temperaturbereich zwischen 12 und 210 K untersucht. Es wird eine Komponente von 230 ps in Zn und von 250 ps in Cd beobachtet, die von der Temperatnr unabhangig ist. Die mittlere Lebensdauer und die Intensitat der langlebigen Komponente nehmen drastisch mit zunehmender Temperatur ab. Diese Ergebnisse werden im Rahmen des Einfangsmodells fur Versetzungen diskutiert, in dem Jogs und/oder Leerstellen als tiefe Einfangzentren fur Positronen wirken. Aus den experimentellen Ergebnissen wird vorgeschlagen, daB Entweichprozesse oberhalb 120 K in Zn und Cd auftreten. l )

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The recovery of electron irradiated zinc and cadmium by positron annihilation spectroscopy

Cited by 15 publications

References 18 publications

Positron lifetime calculations for defects in Zn

Positron lifetime calculations for defects in Zn

Positron Annihilation Lifetime Spectroscopy in the study of defects in materials

Positron-Dislocation Interaction in Deformed Zn and Cd

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