Cu-Ni alloy nanocluster formation by ion implantation in silicate glasses: Structure and optical properties F. D'Acapito, G. Battaglin, E. Cattaruzza, F. Gonella, C. Maurizio, P. Mazzoldi, S. Mobilio and F. Zontone Eur. Phys. J. D, 10 1 (2000) 123-129 Published online: 15 April 2000 DOI: 10.1007/s100530050533