X-ray and gamma irradiation effects on dipole defects in CaF 2 : La, Yb, Al

Impurity-interstitial dipoles in calcium fluoride solutions with Al 3 + , Yb 3 + and La 3 + fluorides were studied using the thermally stimulated depolarization current (TSDC) technique. The dipolar complexes are formed by substitutional trivalent ions in Ca 2 + sites and interstitial fluorine in ne...

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Bibliographic Details
Published inRadiation measurements Vol. 43; no. 2; pp. 227 - 230
Main Authors Arantes, L.O., Ferreira, R.B., Carvalhaes, R.P.M., Blak, A.R.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 2008
Subjects
Calcium fluoride
Static computer simulation
Thermally stimulated depolarization currents
Static computer simulation
Thermally stimulated depolarization currents
Calcium fluoride
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Summary:Impurity-interstitial dipoles in calcium fluoride solutions with Al 3 + , Yb 3 + and La 3 + fluorides were studied using the thermally stimulated depolarization current (TSDC) technique. The dipolar complexes are formed by substitutional trivalent ions in Ca 2 + sites and interstitial fluorine in nearest neighbor sites. The relaxations observed at 150 K are assigned to dipoles nnR S 3 + – F i - ( R S = La or Yb). The purpose of this work is to study the processes of energy storage in the fluorides following X-ray and gamma irradiation. Computer modelling techniques are used to obtain the formation energy of dipole defects.
ISSN:1350-4487
1879-0925
DOI:10.1016/j.radmeas.2007.09.020