Defects in Zirconia Nanomaterials Doped with Rare-Earth Oxides

• Authors: I. Prochazka , J. Cizek , O. Melikhova , T. Konstantinova , I. Danilenko
• Languages of publication: EN

Abstracts

EN

Positron lifetime and coincidence Doppler broadening measurements on ZrO_2+3 mol.% RE_2O_3 (RE = Eu, Gd, Lu) nanopowders and ceramics obtained by sintering these nanopowders are reported. The initial nanopowders were prepared by a co-precipitation technique and exhibited a mean particle size of ≈ 15 nm. The nanopowders were calcined and pressure-compacted. All compacted nanopowders exhibited the prevailing tetragonal phase with at most 15% of the monoclinic admixture. Positrons in compacted nanopowders were found to annihilate almost exclusively at grain boundaries: (i) vacancy-like misfit defects along grain boundaries and (ii) larger defects situated at intersections of grain boundaries (triple points). In nanopowders, a small portion of positrons formed positronium in pores between crystallites. Sintering of nanopowders at 1500C caused a substantial grain growth and formation of ceramics. Sintering-induced grain growth led to a disappearance of the triple points and pores. The ceramics containing Eu and Gd dopants consist of mixture of the monoclinic and the tetragonal phase, while the ceramics with Lu dopant exhibits almost exclusively the tetragonal phase.

Keywords

EN

81.07.Wx; 61.46.Hk; 78.70.Bj

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
• 61.46.Hk: Nanocrystals

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 3
• Pages: 760-763

Dates

published

2014-03

Contributors

author

I. Prochazka

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

author

J. Cizek

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

author

T. Konstantinova

• National Academy of Sciences of Ukraine, Donetsk Institute for Physics and Engineering named after O.O. Galkin Luxemburg Str. 72, 83114 Donetsk, Ukraine

author

I. Danilenko

• National Academy of Sciences of Ukraine, Donetsk Institute for Physics and Engineering named after O.O. Galkin Luxemburg Str. 72, 83114 Donetsk, Ukraine

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Identifiers

DOI

10.12693/APhysPolA.125.760