Ba Ca0.432 Cu2 O6.98 Pr0.568 Sr Tl0.964 Sundaresan A, Michel C, Raveau B, Huong P Chemistry of Materials 9 (1997) 2212-2217 Charge-transfer-induced insulator-superconductor transition in TlBa2-xSrxCa0.4Pr0.6Cu2O7-d: a joint neutron/X ray Rietveld refinement, infrared absorption, and Raman scattering studies _cod_database_code 1001791 _database_code_amcsd 0012214 3.85262 3.85262 12.2813 90 90 90 P4/mmm atom x y z occ Tl1 0 .080 0 .241 Ba1 .5 .5 .2094 .5 Sr1 .5 .5 .2094 .5 Ca1 .5 .5 .5 .432 Pr1 .5 .5 .5 .568 Cu1 0 0 .3621 O1 0 0 .1681 O2 .5 0 .3742 O3 .5 .399 0 .245