Ba2 Ca1.856 Cu3.276 O10 Tl1.864 Sinclair D, Aranda M, Attfield P, Rodriguez-Carvajal J Physica C 225 (1994) 307-316 Cation distribution and composition of the Tl-2223 superconductor from combined powder neutron and resonant X-ray diffraction _cod_database_code 1006076 _database_code_amcsd 0015064 3.85174 3.85174 35.65889 90 90 90 I4/mmm atom x y z occ Tl1 .5276 .5276 .22079 .215 Cu1 .5 .5 .2145 .138 Ba1 0 0 .14530 Ca1 0 0 .04677 .928 Tl2 0 0 .04677 .072 Cu2 .5 .5 0 Cu3 .5 .5 .08879 O1 .5 0 0 O2 .5 0 .0885 O3 .5 .5 .1640 O4 .0819 .0819 .2244 .25