RADIATION INDUCED POINT DEFECTS IN CaF₂, SrF₂, BaF₂ AND MgF₂.

authored by

W. Buttler, H. J. Stoeckmann, F. Fujara, P. Heitjans, G. Kiese, H. Ackermann, B. Bader, K. Doerr, H. Grupp, H. Lauter

Abstract

Single crystals of several alkaline earth fluorides were irradiated with thermal polarized neutrons at various temperatures. The neutron capture process **1**9F(n, gamma )**2**0F produces recoil displaced **2**0F ions (recoil energy: several hundred ev) and simultaneously some nearby point defects. These defects were studied by their influence on the **2**0F NMR spectrum monitored by the asymmetric beta -decay of the polarized **2**0F nuclei. In the cubic crystals CaF//2, SrF//2 and BaF//2 one annealing step was observed in the region of 60-100 K corresponding to an activation enthalpy of about 0. 2 ev. A second step occurs near 220 K, corresponding to about 0. 6 ev. In tetragonal MgF//2 two annealing steps were observed at 13 and 60 K corresponding to 0. 037 and 0. 17 ev, respectively.

External Organisation(s)

Heidelberg University
Institut Laue-Langevin

Type

Conference article

Journal

Journal de physique. Colloque

Volume

41

Pages

c6. 381-c6. 384

ISSN

0449-1947

Publication date

1979

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Engineering