Ba Cu O6 Sr Tl2 Martin C, Maignan A, Huve M, Michel C, Hervieu M, Raveau B European Journal of Solid State and Inorganic Chemistry 30 (1993) 7-18 The influence of alkaline-earth ions on the properties of the "2201" superconductive cuprates: the solid solution Tl2Ba2-xSrxCuO6+d _cod_database_code 1001521 _database_code_amcsd 0012561 3.7988 3.7988 22.7109 90 90 90 I4/mmm atom x y z occ Tl1 .042 0 .2019 .25 Ba1 .5 .5 .0830 .5 Sr1 .5 .5 .0830 .5 Cu1 0 0 0 O1 0 .5 0 O2 0 0 .107 O3 .62 0 .207 .25