Positron annihilation studies of zirconia doped with metal cations of different valence
Positron annihilation studies of zirconia doped with metal cations of different valence
Prochazka, I.; Cizek, J.; Melikhova, O.; Konstantinova, T. E.; Danilenko, I. A.; Yashchishyn, I. A.; Anwand, W.; Brauer, G.
New results obtained by applying positron annihilation spectroscopy to the investigation of zirconia-based nanomaterials doped with metal cations of different valence are reported. The slow-positron implantation spectroscopy combined with Doppler broadening measurements was employed to study the sintering of pressure-compacted nanopowders of tetragonal yttria-stabilised zirconia (t-YSZ) and t-YSZ with chromia additive. Positronium (Ps) formation in t-YSZ was proven by detecting 3γ-annihilations of ortho-Ps and was found to gradually decrease with increasing sintering temperature. A subsurface layer with enhanced 3γ-annihilations, compared to the deeper regions, could be identified. Addition of chromia was found to inhibit Ps formation. In addition, first results of positron lifetime measurements on nanopowders of zirconia phase-stabilised with MgO and CeO2 are presented.
Keywords: positron annihilation spectroscopy; zirconia-based nanomaterials; positronium formation
Involved research facilities
- P-ELBE
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Journal of Physics: Conference Series 443(2013), 012026
Online First (2013) DOI: 10.1088/1742-6596/443/1/012026
Cited 2 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-19134