Positron Annihilation Study of Defects in the Cage-Type Uranium Compound

• Authors: A. Rubaszek
• Languages of publication: EN

Abstracts

EN

The electron and positron properties of the UIr_2Zn_{20} compound of the Fd-3m cage-type crystal structure are studied. The characteristics for the perfect crystal are compared with their counterparts in the elements containing Ir and Zn vacancy. The presence of the vacancy hardly influences the electron charge density around individual atoms. In contrast to electrons, the positron is strongly localized inside the vacancy and the transfer of positron charge is observed. The positron lifetime, τ, appears to be strongly sensitive to the presence and type of the vacancy. Furthermore, this parameter calculated for the perfect crystal is very close to the experimental value for Zn. Here the theoretical values of τ depend on the approach applied to the electron positron (e-p) correlations.

Keywords

EN

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)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 3
• Pages: 737-740

Dates

published

2014-03

Contributors

author

A. Rubaszek

• W. Trzebiatowski Institute of Low Temperatures and Structure Research, Polish Academy of Sciences P.O. Box 1410, 50-950 Wrocław 2, Poland

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Identifiers

DOI

10.12693/APhysPolA.125.737