Positron Annihilation in Magnetite Nanopowders Prepared by Co-Precipitation Method

• Authors: K. Durak , M. Wiertel , Z. Surowiec , A. Miaskowski
• Languages of publication: EN

Abstracts

EN

Nanosized iron oxide powders are materials considered with regard to its application in medical therapy called hyperthermia. Magnetite nanopowders with crystallite size varying from 6.6 to 11.8 nm have been prepared by the co-precipitation method. In this study a change of a crystallite size is driven mainly by varying of initial pH of water ammonia solution in which a process of magnetite precipitation runs. Crystallographic structures and phase composition obtained samples and the size of magnetite nanoparticles were determined by X-ray diffraction method. Positron lifetime spectroscopy has been used to assess defectiveness of microstructure. Experimental positron annihilation spectra were successfully resolved into three lifetime components. It appears that from point of view of microstructure the defects concentrations in studied nanopowder samples are very high which causes a saturation of positron trapping.

Keywords

EN

81.07.Wx; 47.65.Cb; 78.70.Bj; 61.72.J-; 61.72.Mm; 68.37.Hk

Discipline

• 81.07.Wx: Nanopowders
• 61.72.J-: Point defects and defect clusters
• 61.72.Mm: Grain and twin boundaries
• 47.65.Cb: Magnetic fluids and ferrofluids
• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 68.37.Hk: Scanning electron microscopy (SEM) (including EBIC)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 132
• Issue: 5
• Pages: 1593-1597

Dates

published

2017-11

Contributors

author

K. Durak

• Department of Nuclear Methods, Faculty of Mathematics, Physics and Computer Science, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

M. Wiertel

• Department of Nuclear Methods, Faculty of Mathematics, Physics and Computer Science, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

Z. Surowiec

• Department of Nuclear Methods, Faculty of Mathematics, Physics and Computer Science, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

A. Miaskowski

• Department of Applied Mathematics and Computer Science, University of Life Sciences in Lublin, Lublin, Poland

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Identifiers

DOI

10.12693/APhysPolA.132.1593