Artículos de revistas
X-ray and gamma irradiation effects on dipole defects in CaF2 : La, Yb, Al
Fecha
2008Registro en:
RADIATION MEASUREMENTS, v.43, n.2/Jun, p.227-230, 2008
1350-4487
10.1016/j.radmeas.2007.09.020
Autor
Arantes, L O
Ferreira, R B
Carvalhaes, R P M
Blak, Ana Regina
Institución
Resumen
Impurity-interstitial dipoles in calcium fluoride solutions with Al3+, Yb3+ and La3+ fluorides were studied using the thermally stimulated depolarization current (TSDC) technique. The dipolar complexes are formed by substitutional trivalent ions in Ca2+ 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. (C) 2007 Elsevier Ltd. All rights reserved.