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Cu 2 O reacts with La 2 O 3 , Nd 2 O 3 , Sm 2 O 3  and Eu 2 O 3  to form double oxides Cu(RE)O 2  with the rhombohedral NaHF 2  structure. The interatomic distances for CuLaO 2  are given. For the NaHF 2 -type compounds Cu 1+ Me 3+ O 2  (Me 3+  = Al, Cr, Ga, Mn, Fe, Co, Rh as well as La, Pr, Nd, Sm, Eu) an increase of the lattice parameter  a  (hexagonal orientation) with increasing size of Me 3+  is observed, while the changes of  c  are only small. Oxides Cu 1+ (RE)O 2  with (RE) 3+  ions smaller than Eu 3+  and with Y 3+  or In 3+  could not be obtained. The preparation of the corresponding silver compounds Ag 1+ (RE)O 2  was also not successful.

Cu 1+ -haltige Doppeloxide mit seltenen Erdmetallen 1