Ba Ca0.2 Cu0.6 Nd1.8 Ni0.4 O5 Barbey L, Nguyen N, Raveau B Journal of Solid State Chemistry 102 (1993) 156-163 Nd2BaCuO5-type structure: nickel in square planar coordination and copper mixed valency _cod_database_code 1001558 _database_code_amcsd 0013761 6.6909 6.6909 5.7601 90 90 90 P4/mbm atom x y z occ Ba1 .5 .5 .5 Nd1 .1740 .6740 0 .9 Ca1 .1740 .6740 0 .1 Cu1 .5 0 .5 .6 Ni1 .5 0 .5 .4 O1 0 0 0 O2 .3593 .8593 .2674