Positron Annihilation in γ-Irradiated Amorphous Iron Alloys

• Authors: V. Mikhalenkov , A. Chernyashevskii , A. Shalaev
• Languages of publication: EN

Abstracts

EN

One-dimensional angular correlation of annihilation radiation was measured in a series of amorphous (Fe_{100-x}Cr_{x})_{85}B_{15} alloys (x = 0-32) exposed to γ-irradiation from intensive ^{60}Co source. The relevant shape parameters were compared with those in non-irradiated alloys. Irradiation-induced changes of those parameters were found to depend on Cr contents x. The opposite signs of these changes were observed in x < 4 and x > 4 ranges, while near x = 4 the parameters stayed unchanged. We try to interpret the results assuming that γ-quanta are able to knock out boron atoms from their positions into large cavities, thus preventing positron trapping. The crystalline embryos model of amorphous alloys suggested by Hamada and Fujita is also used for explanation of the observed effects.

Keywords

EN

61.43.Dq; 61.80.Ed; 78.70.Bj

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 61.80.Ed: γ-ray effects
• 61.43.Dq: Amorphous semiconductors, metals, and alloys

• Journal: Acta Physica Polonica A
• Year: 1993
• Volume: 83
• Issue: 3
• Pages: 359-363

Dates

published

1993-03

Contributors

author

V. Mikhalenkov

• Institute of Metal Physics, Ukrainian Academy of Sciences, Vernadskii str. 36, 252680 Kiev-142, Ukraine

author

A. Chernyashevskii

• Institute of Metal Physics, Ukrainian Academy of Sciences, Vernadskii str. 36, 252680 Kiev-142, Ukraine

author

A. Shalaev

• Institute of Metal Physics, Ukrainian Academy of Sciences, Vernadskii str. 36, 252680 Kiev-142, Ukraine

Identifiers

DOI

10.12693/APhysPolA.83.359