THERMOLUMINESCENCE PROPERTIES

OF CaF2-LiF:Mn EUTECTIC MELT GROWN COMPOSITES

A. Chouiyakh1, F. Gimeno2, J. I. Peña2, L. Contreras2, V.M. Orera2*

1 Departement de Physique, Faculté des Sciences, Université Ibn Tofail, Kenitra, Maroc

2 Instituto de Ciencia de Materiales de Aragón, C.S.I.C.-Univ. de Zaragoza, 50009 Zaragoza, Spain

* Corresponding author. E-mail: orera@posta.unizar.es

Received : 08 May 2002; revised version accepted : 14 June 2003

Abstract

CaF2-LiF eutectic composites were produced from the melt by the Bridgmann method. The microstructure consists of large eutectic grains with an alternating lamellar structure of LiF and CaF2 crystals about 5mm wide. The material is very strong from the point of view of mechanical properties and chemical stability consequence of the eutectic microstructure and they are resistant to cleavage. Although samples presented some light dispersion due to the differences in the refractive index of the crystals, they were transparent enough to permit optical absorption and emission studies. Doped with Mn the material is an efficient phosphor. We present some thermal stimulated phosphorescence or thermoluminescence (TL) results. The material is a very efficient TL material.

Keywords: Eutectic composites; CaF2-LiF:Mn; Thermoluminescence.

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