Defect studies in annealed ZnO by positron annihilation spectroscopy

Coincidence Doppler broadening of the positron annihilation technique has been employed to identify the defects in thermally annealed 'as-received' ZnO and thermally annealed ball-milled nanocrystalline ZnO. Results indicate that a significant amount of oxygen vacancy has been created in Z...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2008-01, Vol.20 (4), p.045217-045217 (4)
Main Authors: Sanyal, D, Roy, Tapatee Kundu, Chakrabarti, Mahuya, Dechoudhury, Siddhartha, Bhowmick, Debasis, Chakrabarti, Alok
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Defects and impurities in crystals
microstructure
Exact sciences and technology
Materials science
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other interactions of matter with particles and radiation
Physics
Point defects (vacancies, interstitials, color centers, etc.) and defect clusters
Positron annihilation
Structure of solids and liquids
crystallography
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Summary:Coincidence Doppler broadening of the positron annihilation technique has been employed to identify the defects in thermally annealed 'as-received' ZnO and thermally annealed ball-milled nanocrystalline ZnO. Results indicate that a significant amount of oxygen vacancy has been created in ZnO due to annealing at about 500 deg C and above. The results also indicate that the Zn vacancy created during the ball milling process can be easily removed by annealing the sample at about 500 deg C and above. The defect characterization has also been correlated with the magnetic properties of ZnO.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/20/04/045217