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Positron Annihilation in Internally Oxidized Copper

100%
Misheva M., Nancheva N., Feschiev N.
Acta Physica Polonica A
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1993
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vol. 83
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issue 3
365-369
EN
The positron lifetimes in internally oxidized polycrystalline copper, annealed at different temperatures, were measured. It was found that the dispersed alumina particles act as positron traps. Estimation of concentration of defects was made in the frames of the trapping model.
2
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Study of Defects in GeTe and (GeTe)_{1-x}(AgBiTe_2)_x Solid Solutions by Positrons

100%
Misheva M., Avramova I., Plachkova S., Djourelov N.
Acta Physica Polonica A
|
2001
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vol. 99
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issue 3-4
423-428
EN
Positron lifetimes and Doppler broadening of the annihilation line measurements were performed to study the vacancy type defects in polycrystalline GeTe and (GeTe)_{(1-x)}(AgBiTe_2)_x (x=0,0.03,0.05,0.1,0.15,0.2, and 1) solid solutions. The values of lifetimes obtained are explained as due to positron and positronium saturated trapping at vacancies and vacancy clusters. The interdependence between mean positron lifetime and hole concentration is discussed.
3
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Effect of Annealing on Free-Volume Properties of Poly(ethylene Terephthalate) Studied by Positron Annihilation

100%
Misheva M., Djourelov N., Seganov I.
Acta Physica Polonica A
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2001
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vol. 99
|
issue 3-4
429-433
EN
The effect of annealing on free-volume properties of poly( ethylene terephthalate) was studied using a set of samples annealed for two hours in air at eight temperatures between 80ºC and 220ºC. The fractional free-volume in the samples was estimated from ortho-positronium lifetime and its relative intensity. The variations of fractional free-volume and of the macroscopic specific volume with annealing temperature were compared. The variation of the pore volume probability density functions with the annealing temperature was found. The interdependence between S- and W-parameters was also discussed.
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