data_global _amcsd_formula_title 'Cu2 O7 Sr2 Tl Y' loop_ _publ_author_name 'Huve M' 'Martin C' 'Michel C' 'Maignan A' 'Hervieu M' 'Raveau B' _journal_name_full 'Journal of Physics and Chemistry of Solids' _journal_volume 54 _journal_year 1993 _journal_page_first 145 _journal_page_last 152 _publ_section_title ; Influence of the size of alkaline earth cations on the structural distortion and transport properties of the semiconducting 1212 - type cuprates TlBa2-xSrxLnCu2O7 _cod_database_code 1001526 ; _database_code_amcsd 0013241 _chemical_formula_sum 'Tl Sr2 Y Cu2 O7' _cell_length_a 3.8157 _cell_length_b 3.8157 _cell_length_c 11.9963 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 174.661 _exptl_crystal_density_diffrn 6.727 _symmetry_space_group_name_H-M 'P 4/m m m' loop_ _space_group_symop_operation_xyz 'x,y,z' '-y,-x,z' 'y,x,-z' 'y,-x,-z' '-y,x,z' 'x,-y,z' '-x,y,-z' 'x,y,-z' '-x,-y,z' 'y,x,z' '-y,-x,-z' '-y,x,-z' 'y,-x,z' '-x,y,z' 'x,-y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy Tl1 0.06000 0.00000 0.00000 0.25000 Sr1 0.50000 0.50000 0.21010 1.00000 Y1 0.50000 0.50000 0.50000 1.00000 Cu1 0.00000 0.00000 0.36380 1.00000 O1 0.00000 0.50000 0.37800 1.00000 O2 0.00000 0.00000 0.17300 1.00000 O3 0.50000 0.50000 0.00000 1.00000