Abstract
Positron lifetime measurements are conducted in metal oxide material with hexagonal structure, in the temperature range from 30 K to 500 K. The analysis of the positron lifetime spectra is best fitted to two lifetime components. The positron lifetime in a defect-free region ranges from 177 ps to 186 ps in the temperature range. The second lifetime components of localized positron range from 350 ps to 462 ps in the temperature range. The second positron lifetime components are attributed to positron trapping at vacancy complexes. A close analysis of second lifetime components coupled with the fact that annihilation ratios are greater than threshold value of 1.4 suggests a formation of vacancy clusters in the temperature range from about 250 K to 500 K.
Original language | English |
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Title of host publication | PROCEEDINGS OF SAIP2012: THE 57TH ANNUAL CONFERENCE OF THE SOUTH AFRICAN INSTITUTE OF PHYSICS |
Editors | JJ VanRensburg |
Pages | 81-84 |
Number of pages | 4 |
Publication status | Published - 2012 |
MoE publication type | A4 Article in a conference publication |
Event | Annual Conference of the South African Institute of Physics - Pretoria, South Africa Duration: 9 Jul 2012 → 13 Jul 2012 Conference number: 57 |
Conference
Conference | Annual Conference of the South African Institute of Physics |
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Abbreviated title | SAIP |
Country | South Africa |
City | Pretoria |
Period | 09/07/2012 → 13/07/2012 |