Abstract
The combined results obtained by ionic thermal currents (ITC) and electron paramagnetic resonance (EPR) techniques on CaF 2 double-doped either with Gd+Lu or Gd+Sm are presented here. In both systems a fraction of the Gd ions are observed in tetragonal and cubic sites. The Gd+Lu systems shows a very weak ITC spectrum in contrast to the Gd+Sm samples which present at least eight peaks of dipolar origin. The differences observed are accounted for by the existence in one case of an hexamer structure from the lowest Lu doping level and in the second case by the scavenging of F i - by clusters of increasing size with the Sm concentration. The experimental results confirm the predictions from HADES simulations that take into account the ion size effects.
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