Ba Ca0.22 Er1.78 Ni O5 Alonso J, Rasines I, Rodriguez-Carvajal J, Torrance J Journal of Solid State Chemistry 109 (1994) 231-240 Hole and electron doping of R2BaNiO5 (R=rare earths) _cod_database_code 1006068 _database_code_amcsd 0013803 3.7423 5.7416 11.2729 90 90 90 Immm atom x y z occ Ca1 .5 0 .2038 .112 Er1 .5 0 .2038 .888 Ba1 .5 .5 0 Ni1 0 0 0 O1 0 .2397 .1481 O2 .5 0 0