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

verfasst von

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.

Externe Organisation(en)

Ruprecht-Karls-Universität Heidelberg
Institut Laue-Langevin

Typ

Konferenzaufsatz in Fachzeitschrift

Journal

Journal de physique. Colloque

Band

41

Seiten

c6. 381-c6. 384

ISSN

0449-1947

Publikationsdatum

1979

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeiner Maschinenbau