Ba2 Ca Cu2 O8 Tl1.81 Michel C, Martin C, Hervieu M, Maignan A, Provost J, Huve M, Raveau B Journal of Solid State Chemistry 96 (1992) 271-286 Thallium nonstoichiometry in 2212-thallium cuprate _cod_database_code 1001533 _database_code_amcsd 0013725 3.8489 3.8489 29.3153 90 90 90 I4/mmm atom x y z occ Tl1 .5 .5 .2132 .860 Ca1 .5 .5 .2132 .045 Ba1 0 0 .1213 Ca2 0 0 0 .91 Tl2 0 0 0 .09 Cu1 .5 .5 .0545 O1 0 .5 .0510 O2 .5 .5 .1461 O3 .5 .5 .2838