Positron annihilation studies of zirconia doped with metal cations of different valence

16th International Conference on Positron Annihilation

Prochazka, I.^1 ; Cizek, J.^1 ; Melikhova, O.^1 ; Konstantinova, T.E.^2 ; Danilenko, I.A.^2 ; Yashchishyn, I.A.^2 ; Anwand, W.^3 ; Brauer, G.^3

Charles University in Prague, Faculty of Mathematics and Physics, Department of Low Temperature Physics, V Holesovickach 2, CZ 180 00 Praha 8, Czech Republic^1

Donetsk Institute for Physics and Engineering Named after O.O. Galkin, National Academy of Sciences of Ukraine, Luxemburg Street 72, 83114 Donetsk, Ukraine^2

Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, POB 51 01 19, D-01314 Dresden, Germany^3

关键词: Doppler broadening measurements;    Positron lifetime measurements;    Positronium formation;    Pressure-compacted nanopowders;    Ps formations;    Sintering temperatures;    Slow positron implantation spectroscopies;    Subsurface layer;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012026/pdf
DOI  :  10.1088/1742-6596/443/1/012026

来源: IOP

【 摘 要 】

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 CeO2are presented.