Positron Lifetimes in Zirconia-Based Nanomaterials

• Authors: I. Procházka , J. Čížek , J. Kuriplach , O. Melikhova , T. Konstantinova , I. Danilenko
• Languages of publication: EN

Abstracts

EN

Positron lifetime spectroscopy is employed in a comparative study of several zirconia-based materials: (i) the pressure-compacted nanopowders of the three zirconia polymorphs - pure ZrO_2 (monoclinic), yttria-stabilized ZrO_2+3 mol.% Y_2O_3 (tetragonal) and yttria-stabilized ZrO_2+8 mol.% Y_2O_3 (cubic), (ii) ceramic materials obtained by sintering of the above two yttria-stabilized zirconia nanopowders and (iii) the tetragonal and cubic yttria-stabilized zirconia monocrystals. Positron lifetime data observed on the nanopowders suggest that the two shortest components, exhibiting lifetimes of ≈180 and ≈370 ps, arise from the annihilation of positrons trapped in defects associated with grain boundaries, presumably the vacancy-like defects and tripple points, respectively. Positron lifetime spectra observed on the ceramic materials resemble those found for the corresponding monocrystals, giving thus an additional support to the above interpretation of the nanopowders results.

Keywords

EN

78.70.Bj; 61.46.Hk; 81.05.Je; 81.07.Wx

Discipline

• 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)
• 81.07.Wx: Nanopowders
• 81.05.Je: Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)(for ceramics in electrochemistry, see 82.45.Yz)
• 61.46.Hk: Nanocrystals

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 5
• Pages: 1495-1499

Dates

published

2008-05

received

2007-09-03

Contributors

author

I. Procházka

• Charles University in Prague, Faculty of Mathematics and Physics, Department of Low Temperature Physics, V Holesovickach 2, 180 00 Praha 8, Czech Republic

author

J. Čížek

• Charles University in Prague, Faculty of Mathematics and Physics, Department of Low Temperature Physics, V Holesovickach 2, 180 00 Praha 8, Czech Republic

author

J. Kuriplach

• Charles University in Prague, Faculty of Mathematics and Physics, Department of Low Temperature Physics, V Holesovickach 2, 180 00 Praha 8, Czech Republic

author

O. Melikhova

• Charles University in Prague, Faculty of Mathematics and Physics, Department of Low Temperature Physics, V Holesovickach 2, 180 00 Praha 8, Czech Republic

author

T. Konstantinova

• Galkin Donetsk Institute for Physics and Engineering, National Academy of Science of Ukraine, Luxemburg Str., 83114 Donetsk, Ukraine

author

I. Danilenko

• Galkin Donetsk Institute for Physics and Engineering, National Academy of Science of Ukraine, Luxemburg Str., 83114 Donetsk, Ukraine

References

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Identifiers

DOI

10.12693/APhysPolA.113.1495