Positron annihilation lifetime and doppler broadening spectroscopies studies of defects in nano TiN crystal under gamma irradiation and high temperature: Positron annihilation lifetime and doppler broadening spectroscopies studies: A S Abiyev et al.
Abiyev A.S. Huseynov E.M. Mirzayev M.N. Mauyey B. Samadov S.F.
December 2024Springer
Indian Journal of Physics
2024#98Issue 144703 - 4709 pp.
In this study, TiN nanocrystals underwent initial irradiation at room temperature using a 60Co gamma source, employing four absorption doses (50, 200, 900, and 3500 kGy) within a Gamma MRX-25 unit. Subsequently, they were subjected to heating at 1173 K in a Linn™ HT-1800 oven under vacuum conditions of 10–6 Torr for Positron analysis. The investigation into the mechanism of defect formation employed annihilation lifetime and Doppler broadening annihilation spectroscopies. Pertaining to the Positron Annihilation Lifetime Spectroscopy (PALS) studies, two distinct lifetime components were discerned across all samples. The τ1 lifetime component ranged between 155 and 159 ps. A marginal reduction (from 81.67 to 81.51%) was observed in the corresponding I1 intensity. Analysis of the S parameter derived from Doppler Broadening Annihilation Spectroscopy (DBAS) furnished insights into the presence of vacancy defects within the TiN nanocrystals. The diminishing trend in the S parameter with increasing positron energy or depth of positron implantation indicates a decline in the density and concentration of subsurface defects.
Coatings materials , DBAS , Defects formation , Gamma irradiation , High temperature , PALS
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International Intergovernmental Organization Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation
Innovation and Digital Development Agency, Baku, AZ-1073, Azerbaijan
Western Caspian University, Baku, AZ1001, Azerbaijan
Institute of Radiation Problems, Ministry of Science and Education Republic of Azerbaijan, Baku, AZ1143, Azerbaijan
Azerbaijan State University of Economics (UNEC), Baku, AZ-1001, Azerbaijan
Khazar University, Baku, AZ1096, Azerbaijan
L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
International Intergovernmental Organization Joint Institute for Nuclear Research
Innovation and Digital Development Agency
Western Caspian University
Institute of Radiation Problems
Azerbaijan State University of Economics (UNEC)
Khazar University
L.N. Gumilyov Eurasian National University
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