A novel technique for measuring diffusivities of short-lived radioisotopes in solids

Thilo Voss; Andreas Strohm; Stefan Matics; Peter Scharwaechter; Werner Frank

doi:10.1515/ijmr-2002-0184

Article

A novel technique for measuring diffusivities of short-lived radioisotopes in solids

Thilo Voss , Andreas Strohm , Stefan Matics , Peter Scharwaechter and Werner Frank

Published/Copyright: February 12, 2022

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From the journal International Journal of Materials Research Volume 93 Issue 10

Abstract

After reminding the reader of the major techniques for measuring diffusion coefficients in solids, a detailed description of the conventional radiotracer techniques is presented. These allow to measure solid-state diffusivities in the regime 10^{– 8}–10^{– 24} m²s^{– 1} and therefore, and for other reasons to be discussed, are superior to all competing methods. However, the conventional radiotracer techniques suffer from the restriction that they are not applicable to radio-tracer atoms with half-lives t_1/2 ≲ 1 d. The main objective of this paper is to introduce a novel experimental set-up which enables us to perform radiotracer-type diffusivity measurements with short-lived radioisotopes (1 d ≳ t ≳ 10 min). First results on the diffusion of ³¹Si (t_1/2 = 2.6 h) and ¹¹C (t_1/2 = 20.38 min) in Si–Ge alloys and Si –C–N-based ceramics measured in this set-up are presented.

Keywords: Diffusivities in solids measured by radiotracer techniques; Novel set-up for short-lived radiotracer atoms; Diffusion of 31Si and 11C in Si –Ge and Si0.29B0.09C0.41N0.21

Dedicated to Professor Dr. Helmut Kronmüller on the occasion of his 70th birthday

Prof. Dr. Werner Frank Max-Planck-Institut für Metallforschung Heisenbergstr. 1, D-70569 Stuttgart, Germany Tel.: +49 711 689 1940 Fax: +49 711 689 1922

The authors wish to thank C. Grodon, J. Huikari, P. Laitinen, A. Nieminen, and J. Räisänen for their assistance in carrying out the experiments. F. Aldinger’s and J. Bill’s support of and stimulating interest in our diffusion measurements on polymer-derived ceramics is gratefully acknowledged. The provision of the specimen materials by Lawrence Berkeley Laboratory, CA, USA, by Institut für Festkörperphysik der ETH Zürich, Switzerland, by Institute of Physics and Astronomy, Aarhus, Denmark, by Wacker-Siltronic, Burghausen, Germany, and by Pulvermetallurgisches Laboratorium am Max-Planck-Institut für Metallforschung, Stuttgart, Germany, is appreciated. Moreover, the authors are grateful to ISOLDE at CERN, Geneva, Switzerland, to Institut für Strahlen- und Kernphysik at Bonn University, Germany, and to IGISOL at University of Jyväskylä, Finland, for radioisotope implantations. Financial support by the Deutsche Forschungsgemeinschaft within the project “Neue Precursorkeramiken aus kondensierten molekularen Vorstufen” (project no. FR999/8-3), by the Academy of Finland within the framework of the Finnish Center of Excellence Program 2000–2005 (project no. 44875 in the Nuclear and Condensed Matter Physics Program at JYFL), and by the HPRI Program of the European Community is acknowledged.

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Received: 2002-05-13

Published Online: 2022-02-12

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https://doi.org/10.1515/ijmr-2002-0184

Keywords for this article

Diffusivities in solids measured by radiotracer techniques; Novel set-up for short-lived radiotracer atoms; Diffusion of 31Si and 11C in Si –Ge and Si0.29B0.09C0.41N0.21