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1 PublicationPositronium probing of pores in zirconia nanopowders
Prochazka, I.; Cizek, J.; Lukac, F.; Melikhova, O.; Hruska, P.; Anwand, W.; Liedke, M. O.; Konstantinova, T. E.; Danilenko, I. A.
Abstract
In the present paper, conventional positron lifetime measurements on selected zirconia-based nanopowders are reported. The nanopowders were doped with various metal cations (Y3+, Eu3+, Gd3+, Lu3+ and Mg2+). Lifetime experiments were conducted in air and supplemented with mass density measurements. In a range of lifetimes, from a few ns to ≈ 70 ns, up to two individual lifetime components could be identified. Such observations confirmed positronium (Ps) formation with subsequent ortho-Ps pick-off annihilation as well as the occurrence of pores of different size. Pore sizes were estimated using a shape-free model of the correlation between pore size and ortho-Ps lifetime. The origins of pores are discussed on the basis of the ortho-Ps data in combination with the results mass density measurements.
Keywords: positron lifetime; Positronium; zirconia nanopowders; mass density measurements; defects
Involved research facilities
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Acta Physica Polonica A 132(2017)2, 1564-1567
DOI: 10.12693/APhysPolA.132.1564
Cited 1 times in Scopus
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Permalink: https://www.hzdr.de/publications/Publ-26387