Spectroscopic study of 'Eu POT. 3+' and 'Eu POT. 3+'/'La POT. 3+' containing Hf'O IND.2' powders and thin films - Gonçalves, Rogéria Rocha; Ribeiro, Sidney J. L.; Messaddeq, Younès (Brazilian Meeting on Inorganic Chemistry (BMIC, 2006)