Positron Lifetime Spectroscopy of Nanocrystalline Copper

• Authors: J. C̆ížek , I. Procházka , P. Vostrý , F. Chmelík , R. Islamgaliev
• Languages of publication: EN

Abstracts

EN

Positron lifetime spectroscopy was applied to investigate the thermal stability of nanocrystalline copper prepared by severe plastic torsion deformation. Positrons annihilating in as prepared specimens exhibited free positron component τ_{1} and two defect components τ_{2}=164 ps and τ_{3}=255 ps. Evolution of the lifetimes and relative intensities of all the three components with increasing annealing temperature during step-by-step isochronal annealing up to 630°C was studied. Behaviour of positrons in nanocrystalline copper could not be interpreted in the frame of conventional 3-state trapping model due to highly inhomogeneous defect distribution. Therefore a modified trapping model was developed and applied to explain the experimental results.

Keywords

EN

78.70.Bj; 79.60.Jv

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)
• 79.60.Jv: Interfaces; heterostructures; nanostructures

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1999
• Volume: 95
• Issue: 4
• Pages: 487-495

Dates

published

1999-04

Contributors

author

J. C̆ížek

• Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic

author

I. Procházka

• Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic

author

P. Vostrý

• Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic

author

F. Chmelík

• Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic

author

R. Islamgaliev

• Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa 450000, Russia

Identifiers

DOI

10.12693/APhysPolA.95.487