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

verfasst von

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.

Externe Organisation(en)

Ruprecht-Karls-Universität Heidelberg
Institut Laue-Langevin

Typ

Artikel

Journal

Zeitschrift für Physik B Condensed Matter and Quanta

Band

30

Seiten

19-27

Anzahl der Seiten

9

ISSN

0340-224X

Publikationsdatum

03.1978

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Elektronische, optische und magnetische Materialien, Physik der kondensierten Materie

Elektronische Version(en)

https://doi.org/10.1007/BF01323665 (Zugang: Unbekannt)