## Bibliotheken

You do not seem to be within the network of Braunschweig University.
As student, researcher or staff member of Braunschweig University you can use the VPN service to gain access to electronic publications.
Alternatively, you can use your university username and password via Shibboleth to gain access to electronic publications with certain publishers. You can find more details in our Blog (in German).
•

# Point defects in alkaline-earth fluorides after thermal neutron irradiation

Single crystals of MgF2, CaF2, SrF2 and BaF2 have been irradiated with polarized, thermal neutrons at temperatures between 10 K and 300 K. The neutron capture process$$^{19} F(\vec n, \gamma )^{20} \vec F$$ creates polarized, β-active20 F(τβ=16s) probe nuclei, which are displaced by the γ recoil and... Full description

 Main Author: Buttler, W. Contributors: Stöckmann, -J. Ackermann, H. Dörr, K. Fujara, F. Grupp, H. Heitjans, P. Kiese, G. Körblein, A. Dubbers, D. Contained in: Zeitschrift für Physik Berlin : Springer Vol. 45, No. 4 (1982), p. 273-282 Journal Title: Fulltext access: Availability is being checked... Interlibrary loan: Check possibility for interlibrary loan Links: Volltext (dx.doi.org) ISSN: 1431-584X Keywords: OriginalPaper DOI: 10.1007/BF01321863
 Language: English Physical Description: Online-Ressource ID (e.g. DOI, URN): 10.1007/BF01321863 BF01321863 PPN (Catalogue-ID): SPR012404764
more publication details ...

### Associated Publications/Volumes

• Associated records are being queried...
more (+)
Internes Format
 LEADER 001 02415nma a2200397 c 4500 SPR012404764 DE-601 20150324072436.0 cr uuu---uuuuu 150313s1982 000 0 eng d 7 |a 10.1007/BF01321863  |2 doi 8 |a BF01321863 |a BF01321863 |b ger  |c GBVCP 0 |a eng 1 |a Buttler, W. 1 0 |a Point defects in alkaline-earth fluorides after thermal neutron irradiation  |h Elektronische Ressource |a Online-Ressource |a Single crystals of MgF2, CaF2, SrF2 and BaF2 have been irradiated with polarized, thermal neutrons at temperatures between 10 K and 300 K. The neutron capture process$$^{19} F(\vec n, \gamma )^{20} \vec F$$ creates polarized, β-active20 F(τβ=16s) probe nuclei, which are displaced by the γ recoil and thus produce some nearby point defects. These defects have been studied by their influence on20 F NMR signals being monitored via the asymmetric β-decay radiation of the polarized20 F nuclei. From our results we conclude that in the fluorites CaF2, SrF2 and BaF2 thermal neutron irradiation leads to the formation of anion Frenkel pairs, the predominant intrinsic defect in such crystals. Correlated recombination of these close Frenkel pairs with activation enthalpies of about 0.2 eV was observed at temperatures around 80 K. A second annealing stage occurs near 220 K corresponding to an activation enthalpy of about 0.6 eV. Possible annealing mechanisms responsible for this stage are discussed. In tetragonal MgF2 two annealing stages were found at 13 K and 60 K corresponding to 0.037 eV and 0.17 eV, respectively. The stage at 60 K possibly reflects migration of the H entre whereas the interpretation of the 13 K stage remains an open question. 2 7 |a OriginalPaper  |2 gnd 0 0 |A f  |a OriginalPaper 0 |5 DE-601 1 |a Stöckmann, -J. 1 |a Ackermann, H. 1 |a Dörr, K. 1 |a Fujara, F. 1 |a Grupp, H. 1 |a Heitjans, P. 1 |a Kiese, G. 1 |a Körblein, A. 1 |a Dubbers, D. 0 8 |i in  |t Zeitschrift für Physik  |d Berlin : Springer  |g Vol. 45, No. 4 (1982), p. 273-282  |q 45:4<273-282  |w (DE-601)SPR012385638  |x 1431-584X 4 1 |u http://dx.doi.org/10.1007/BF01321863  |3 Volltext |a GBV_SPRINGER |a AR |d 45  |j 1982  |e 4  |c 12  |h 273-282