Title
Mn2+-induced substitutional structural changes in ZnS nanoparticles as observed from positron annihilation studies
Abbreviated Journal Title
J. Phys.-Condes. Matter
Keywords
MAGNETIC-PROPERTIES; LIFETIME; SPECTRA; Physics, Condensed Matter
Abstract
Zinc sulfide nanoparticles doped with different concentrations of manganese ions (Mn2+) were synthesized at various temperatures to investigate the effects of substitution and the associated defect evolution. Positron lifetime and Doppler broadening measurements were used as probes. The initial stage of defect recovery was dominated by the occupation of Zn2+ vacancies by Mn2+ ions, bringing in characteristic changes in the positron lifetimes, intensities and Doppler broadened lineshape parameters. Detailed analyses considering the presence of one and two types of defects were carried out to identify the type of defects which trap positrons at the different dopant concentrations. Electron paramagnetic resonance studies indicated increased Mn-Mn interaction and the formation of Mn clusters with further doping. The results are in striking contrast to those for nanorods, where vacancy recombination transformed their interior into regions free of defects.
Journal Title
Journal of Physics-Condensed Matter
Volume
20
Issue/Number
23
Publication Date
1-1-2008
Document Type
Article
Language
English
First Page
10
WOS Identifier
ISSN
0953-8984
Recommended Citation
"Mn2+-induced substitutional structural changes in ZnS nanoparticles as observed from positron annihilation studies" (2008). Faculty Bibliography 2000s. 131.
https://stars.library.ucf.edu/facultybib2000/131
Comments
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