ACTA

STUDY OF DEFECTS IN GeTe AND (GeTe)_1-x(AgBiTe₂)_x SOLID SOLUTIONS BY POSITRONS

M. Misheva^a, I. Avramova^a, St. Plachkova^a and N. Djourelov^b
^aSofia University, Faculty of Physics, 5 J. Bouchier Blvd, 1164, Sofia, Bulgaria
^bInstitute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences 72 Tzarigradsko shosse, 1784, Sofia, Bulgaria

Full Text PDF

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(AgBiTe₂)_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.

DOI: 10.12693/APhysPolA.99.423
PACS numbers: 78.70.Bj