Structure and annealing of (n, γ)-Induced point defects in CaF₂

authored by

H. J. Stöckmann, D. Dubbers, M. Grupp, H. Grupp, H. Ackermann, P. Heitjans

Abstract

Neutron activated²⁰F nuclei (T_1/2=11 s) in CaF₂ serve for two purposes: first they produce well defined point defects by their (n, γ)-production mechanism, second, they act as probes to detect the properties of these defects in a β- and γ-ray detected nuclear magnetic resonance experiment. Below about 70 K an interstitial defect is observed due to a quadrupolar splitting of the²⁰F-NMR line. The defect induced electric field gradient is oriented along the 〈111〉-axis of the crystal and causes a quadrupole coupling constant e²qQ/h=-2.0(1) MHz at the²⁰F site. The defect anneals above 70 K with an Arrhenius like temperature dependence corresponding to an activation energy E_M=0.17(4) eV.

External Organisation(s)

Heidelberg University
Institut Laue-Langevin

Type

Article

Journal

Zeitschrift für Physik B Condensed Matter and Quanta

Volume

30

Pages

19-27

No. of pages

9

ISSN

0340-224X

Publication date

03.1978

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Electronic version(s)

https://doi.org/10.1007/BF01323665 (Access: Unknown)