Temperature dependence of positron diffusion in cubic metals

Soininen, E.; Huomo, H.; Huttunen, P. A.; Mäkinen, J.; Vehanen, A.; Hautojärvi, P.

doi:10.1103/physrevb.41.6227

Cited by 90 publications

(39 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here we used D + = 1.7 ± 0.2 cm 2 s −1 determined for Al in Ref. [34]. Since positron trapping occurs on the surface of cells, the number of positrons trapped in unit time is…”

Section: Estimation Of Defect Densitymentioning

confidence: 99%

Microstructure characterization of rapidly solidified Al–Fe–Cr–Ce alloy by positron annihilation spectroscopy

Michalcová

Vojtěch

Čı́žek

et al. 2011

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…Here we used D + = 1.7 ± 0.2 cm 2 s −1 determined for Al in Ref. [34]. Since positron trapping occurs on the surface of cells, the number of positrons trapped in unit time is…”

Section: Estimation Of Defect Densitymentioning

confidence: 99%

Microstructure characterization of rapidly solidified Al–Fe–Cr–Ce alloy by positron annihilation spectroscopy

Michalcová

Vojtěch

Čı́žek

et al. 2011

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…Nieminen The solution (Carslaw and Jaeger, 1959) (62) where c"'=3/4n(R"r") is a. n "-efFective" void density. (60), which they write in the form mechanical calculations (Blatt and Weisskopf, 1952) as a base, they suggest that the positron-capture cross section can be approximated as ments (Soininen et al , 1990). This may re6ect effects due to shallow traps, which, for simplicity, are not included in our analysis.…”

Section: Positron Trapping At Voids In Metalsmentioning

confidence: 99%

“…According to the simplest estimate, the deformation potential in a metal is given as Ed = --', ez, where E'p is the free-electron Fermi energy. Soininen et al (1990) deduced the deformation potential for several metals from diffusion coe%cients measured by the slow-positron method. They used Eq.…”

Section: Z3mentioning

confidence: 99%

See 1 more Smart Citation

Theory of positrons in solids and on solid surfaces

1994

View full text Add to dashboard Cite

Various experimental methods based on positron annihilation have evolved into important tools for researching the structure and properties of condensed matter. In particular, positron techniques are useful for the investigation of defects in solids and for the investigation of solid surfaces. Experimental methods need a comprehensive theory for a deep, quantitative understanding of the results. In the case of positron annihilation, the relevant theory includes models needed to describe the positron states as well as the different interaction processes in matter. In this review the present status of the theory of positrons in solids and on solid surfaces is given. The review consists of three main parts describing (a) the interaction processes, {b) the theory and methods for calculating positron states, and {c)selected recent results of positron studies of condensed matter. CONTENTS

show abstract

“…Here the specific trapping rate CT, typically of the order of 4 x 1014 s-' (Schaefer, Gugelmeier, Schmolz and Seeger 1984), satisfies the condition CT <( 47croD/ V , (Frank and Seeger 1974) for reaction-controlled trapping when we insert characteristic positron diffusivities D r" m2 s-' (Soininen et al 1990) and typical values of the trapping radius and the atomic volume VA. However, for larger or two-dimensionally extended defects, such as voids , surfaces Oliva 1980) or grain boundaries, the specific trapping rates are higher, so that the conditions for reaction-controlled trapping and for the applicability of rate theories are no longer fulfilled.…”

mentioning

confidence: 98%