Partial Cu occupancy in uranium copper diantimonide, UCu~0.60(4)~Sb~2~
Ringe, Emilie; Ibers, James A.; Acta Crystallographica Section C 64 (2008) i76–i78; doi:10.1107/S0108270108020386

data_2016743
_publ_section_title
;
 Partial Cu occupancy in uranium copper diantimonide, UCu~0.60(4)~Sb~2~
;
_journal_coeditor_code           SQ3154
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              i76
_journal_page_last               i78
_journal_paper_doi               10.1107/S0108270108020386
_journal_volume                  64
_journal_year                    2008
_chemical_formula_iupac          'U Cu0.60(4) Sb2'
_chemical_formula_moiety         'Cu0.634 Sb2 U'
_chemical_formula_sum            'Cu0.634 Sb2 U'
_chemical_formula_weight         521.84
_chemical_name_common            'uranium copper diantimonide'
_chemical_name_systematic
;
uranium copper diantimonide
;
_space_group_IT_number           129
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-P 4a 2a'
_symmetry_space_group_name_H-M   'P 4/n m m :2'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   4.320(4)
_cell_length_b                   4.320(4)
_cell_length_c                   9.341(9)
_cell_measurement_reflns_used    1655
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.52
_cell_measurement_theta_min      4.36
_cell_volume                     174.3(3)
_computing_cell_refinement       'SAINT (Bruker, 2003)'
_computing_data_collection       'SMART (Bruker, 2003)'
_computing_data_reduction        'SAINT (Bruker, 2003)'
_computing_molecular_graphics    'CrystalMaker (Palmer, 2008)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.975
_diffrn_measured_fraction_theta_max 0.975
_diffrn_measurement_device_type  'Bruker SMART 1000 CCD'
_diffrn_measurement_method       \w
_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  0.0750
_diffrn_reflns_av_sigmaI/netI    0.0267
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            1951
_diffrn_reflns_theta_full        28.11
_diffrn_reflns_theta_max         28.11
_diffrn_reflns_theta_min         2.18
_exptl_absorpt_coefficient_mu    65.203
_exptl_absorpt_correction_T_max  0.0859
_exptl_absorpt_correction_T_min  0.0199
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'face-indexed (SADABS; Bruker, 2003)'
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    9.943
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             424.80
_exptl_crystal_size_max          0.1389
_exptl_crystal_size_mid          0.08158
_exptl_crystal_size_min          0.05221
_refine_diff_density_max         1.322
_refine_diff_density_min         -3.324
_refine_ls_extinction_coef       0.0174(16)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 2008)'
_refine_ls_goodness_of_fit_ref   1.200
_refine_ls_matrix_type           full
_refine_ls_number_parameters     13
_refine_ls_number_reflns         155
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.200
_refine_ls_R_factor_all          0.0241
_refine_ls_R_factor_gt           0.0241
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0306P)^2^+1.6422P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0582
_refine_ls_wR_factor_ref         0.0582
_reflns_number_gt                155
_reflns_number_total             155
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sq3154.cif
_cod_data_source_block           I_100K
_cod_original_sg_symbol_H-M      'P 4/n m m'
_cod_database_code               2016743
_cod_database_fobs_code          2016743