data_8101629 _journal_name_full 'Zeitschrift fur Kristallographie - NCS' _journal_year 1999 _publ_section_title ; Crystal structure redetermination of the tetrahedranides Na~4~Sn~4~ and K~4~Sn~4~ ; loop_ _publ_author_name 'Baitinger, M.' 'Schnering, H. G. von' 'Grin, Yu.' 'Kniep, R.' _chemical_name_common 'potassium stannide' _chemical_formula_structural 'K4 Sn4' _chemical_formula_sum 'K4 Sn4' _chemical_formula_weight 5049.28 _symmetry_cell_setting tetragonal _symmetry_space_group_name_H-M 'I 41/a c d' loop_ _symmetry_equiv_pos_as_xyz x,y,z 3/4-y,1/4+x,3/4+z 1/2-x,-y,1/2+z 3/4+y,3/4-x,1/4+z -x,y,1/2+z 1/4+y,1/4+x,1/4+z 1/2+x,-y,z 1/4-y,3/4-x,3/4+z -x,-y,-z -3/4+y,-1/4-x,-3/4-z -1/2+x,y,-1/2-z -3/4-y,-3/4+x,-1/4-z x,-y,-1/2-z -1/4-y,-1/4-x,-1/4-z -1/2-x,y,-z -1/4+y,-3/4+x,-3/4-z 1/2+x,1/2+y,1/2+z 5/4-y,3/4+x,5/4+z 1-x,1/2-y,1+z 5/4+y,5/4-x,3/4+z 1/2-x,1/2+y,1+z 3/4+y,3/4+x,3/4+z 1+x,1/2-y,1/2+z 3/4-y,5/4-x,5/4+z 1/2-x,1/2-y,1/2-z -1/4+y,1/4-x,-1/4-z x,1/2+y,-z -1/4-y,-1/4+x,1/4-z 1/2+x,1/2-y,-z 1/4-y,1/4-x,1/4-z -x,1/2+y,1/2-z 1/4+y,-1/4+x,-1/4-z _cell_length_a 11.409(1) _cell_length_b 11.409(1) _cell_length_c 18.649(2) _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 2427.5(7) _cell_formula_units_Z 8 _exptl_crystal_density_diffrn 3.4482(6) _diffrn_ambient_temperature 295 _diffrn_ambient_environment air _refine_ls_R_factor_obs 0.0360 _refine_ls_wR_factor_obs 0.0360 loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_thermal_displace_type _atom_site_U_iso_or_equiv _atom_site_symmetry_multiplicity _atom_site_Wyckoff_symbol _atom_site_type_symbol _atom_site_occupancy K1 0.8621(3) 0 0.25 Uani 0.0334(8) 16 e K . K2 0.3784(2) 0.6284(2) 0.125 Uani 0.0370(7) 16 f K . Sn 0.06468(6) 0.13783(6) 0.93072(3) Uani 0.0267(2) 32 g Sn . loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 K1 0.0297(14) 0.0360(15) 0.0346(14) 0 0 -0.0052(13) K2 0.0372(10) 0.0372(10) 0.0367(15) 0.0022(13) -0.0009(9) 0.0009(9) Sn 0.0266(3) 0.0276(3) 0.0261(3) -0.0002(3) -0.0061(2) 0.0084(3)