Room-Temperature 181Ta(TiO2): An e-γ TDPAC Study
2022-07-05 | journal article; research paper. A publication with affiliation to the University of Göttingen.
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- Authors
- Yap, Ian Chang Jie; Schell, Juliana; Dang, Thien Thanh; Noll, Cornelia; Beck, Reinhard; Köster, Ulli; Mansano, Ronaldo; Hofsäss, Hans Christian
- Abstract
- In this work, we report on the hyperfine parameters of the foreign 181Ta probe in the rutile structure of the single crystal TiO2 using the e−γ and γ−γ time differential perturbed angular correlation (TDPAC) technique. We implanted 181Hf ions into a sample of single crystal rutile TiO2 in the Bonn Isotope Separator. The implanted sample was then thermally annealed at a temperature of 873 K for 315 min in a vacuum. The 181Hf radioisotopes decayed by β− emission, followed by a cascade to the ground of γ rays or conversion electrons into a stable state 181Ta. The 181Ta probe substitutes the Ti lattice site with a unique nuclear quadrupole interaction, allowing for the precise measurement of the largest electric field gradient (Vzz) and asymmetry parameter (η). The hyperfine parameters obtained from the e−γ TDPAC spectroscopy agree with those of the γ−γ TDPAC spectroscopy at room temperature, apart from a calibration factor, both from our experiments and the literature. This suggests that the electronic recombination following the internal conversion of the L shell electron takes less time (ps) than the intermediate lifetime of the metastable 181Ta state (ns).
- Issue Date
- 5-July-2022
- Journal
- Crystals
- eISSN
- 2073-4352
- Language
- English
- Sponsor
- German Federal Ministry of Education and Research (BMBF)
Foundation for Science and Technology FCT, Portugal