Structural, electronic and optical properties of fluorite-type compounds R. Khenata, B. Daoudi, M. Sahnoun, H. Baltache, M. Rérat, A. H. Reshak, B. Bouhafs, H. Abid and M. Driz Eur. Phys. J. B, 47 1 (2005) 63-70 Published online: 21 September 2005 DOI: 10.1140/epjb/e2005-00301-6