Eur. Phys. J. B (2013) 86: 152
https://doi.org/10.1140/epjb/e2013-31004-x

Regular Article

Dielectric relaxation in ytterbium- and lead-doped calcium fluoride crystals

¹ Faculty of Physics, West University of Timisoara, 300223 Timisoara, Romania
² Alexandru Ioan Cuza University of Iasi, 700506 Iasi, Romania

^a e-mail: stef@physics.uvt.ro

Received: 3 November 2012
Received in final form: 4 February 2013
Published online: 10 April 2013

Abstract

YbF₃-doped and 1 mol% PbF₂ co-doped CaF₂ crystals were grown by vertical Bridgman method using a shaped graphite furnace in vacuum. Dielectric spectra and optical absorption spectra were measured in order to study the influence of Pb²⁺ ions on the charge compensating defects formation. The influence of Pb²⁺ ions on the various charge compensating defects depend on the YbF₃ concentration. For low YbF₃ concentrations the influence is stronger than for concentrations higher than 1 mol% YbF₃. Dielectric relaxation in double doped (Yb,Pb):CaF₂ crystals in order the study the charge compensating defects formation was not reported before.