Ca0.48 Cu2 O6.96 Pr0.52 Sr2 Tl0.94 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 1001792 _database_code_amcsd 0012215 3.82620 3.82620 12.1262 90 90 90 P4/mmm atom x y z occ Tl1 0 .073 0 .235 Sr1 .5 .5 .2101 Ca1 .5 .5 .5 .48 Pr1 .5 .5 .5 .52 Cu1 0 0 .3580 O1 0 0 .1697 O2 .5 0 .3693 O3 .5 .402 0 .240