; Chemistry of Materials  (2004) –; doi:10.1021/cm0499242

data_4000406
_journal_name_full               'Chemistry of Materials'
_journal_paper_doi               10.1021/cm0499242
_journal_year                    2004
_chemical_formula_sum            'Se4 Sn2 Sr'
_chemical_formula_weight         640.84
_space_group_IT_number           43
_symmetry_cell_setting           1
_symmetry_space_group_name_Hall  'F 2 -2d'
_symmetry_space_group_name_H-M   'F d d 2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            32
_cell_length_a                   21.8916(12)
_cell_length_b                   21.8933(12)
_cell_length_c                   13.5470(7)
_cell_measurement_reflns_used    ?
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      ?
_cell_measurement_theta_min      ?
_cell_volume                     6492.8(6)
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean ?
_diffrn_measurement_device_type  ?
_diffrn_measurement_method       ?
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0325
_diffrn_reflns_av_sigmaI/netI    0.0625
_diffrn_reflns_limit_h_max       30
_diffrn_reflns_limit_h_min       -26
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -30
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            10960
_diffrn_reflns_theta_max         30.00
_diffrn_reflns_theta_min         2.00
_diffrn_standards_decay_%        ?
_diffrn_standards_interval_count ?
_diffrn_standards_interval_time  ?
_diffrn_standards_number         ?
_exptl_absorpt_coefficient_mu    30.488
_exptl_absorpt_correction_T_max  1.00
_exptl_absorpt_correction_T_min  ?
_exptl_absorpt_correction_type   sadabs
_exptl_absorpt_process_details   0.60
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    5.245
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             8768
_exptl_crystal_size_max          0.04
_exptl_crystal_size_mid          0.03
_exptl_crystal_size_min          0.015
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.036(14)
_refine_ls_extinction_coef       0.000017(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.308
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     129
_refine_ls_number_reflns         4661
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.308
_refine_ls_R_factor_all          0.0467
_refine_ls_R_factor_gt           0.0331
_refine_ls_shift/su_max          0.053
_refine_ls_shift/su_mean         0.006
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0050P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0992
_refine_ls_wR_factor_ref         0.1044
_reflns_number_gt                3467
_reflns_number_total             4661
_reflns_threshold_expression     >2sigma(I)
_cod_original_sg_symbol_H-M      Fdd2
_cod_database_code               4000406