BaCu2MIVQ4 (MIV = Si, Ge, and Sn; Q = S, Se): synthesis, crystal structures, optical performances and theoretical calculations
Nian, Leyan; Huang, Junben; Wu, Kui; Su, Zhi; Yang, Zhihua; Pan, Shilie; RSC Adv. 7 (2017) 29378–; doi:10.1039/C7RA05022D

data_7228410
_publ_section_title
;
 BaCu2MIVQ4 (MIV = Si, Ge, and Sn; Q = S, Se): synthesis, crystal
 structures, optical performances and theoretical calculations
;
_journal_issue                   47
_journal_name_full               'RSC Adv.'
_journal_page_first              29378
_journal_paper_doi               10.1039/C7RA05022D
_journal_volume                  7
_journal_year                    2017
_chemical_formula_sum            'Ba Cu2 Ge S4'
_chemical_formula_weight         465.25
_space_group_crystal_system      trigonal
_space_group_IT_number           152
_space_group_name_Hall           'P 31 2"'
_space_group_name_H-M_alt        'P 31 2 1'
_symmetry_space_group_name_Hall  'P 31 2"'
_symmetry_space_group_name_H-M   'P 31 2 1'
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2017-03-24 deposited with the CCDC.
2017-06-01 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            3
_cell_length_a                   6.2092(8)
_cell_length_b                   6.2092(8)
_cell_length_c                   15.520(4)
_cell_measurement_reflns_used    1368
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.34
_cell_measurement_theta_min      3.79
_cell_volume                     518.20(16)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0333
_diffrn_reflns_av_unetI/netI     0.0306
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       4
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            3149
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.411
_diffrn_reflns_theta_min         3.789
_diffrn_source                   'sealed tube'
_exptl_absorpt_coefficient_mu    17.089
_exptl_absorpt_correction_T_max  0.7455
_exptl_absorpt_correction_T_min  0.5528
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    4.473
_exptl_crystal_description       block
_exptl_crystal_F_000             630
_exptl_crystal_size_max          0.312
_exptl_crystal_size_mid          0.225
_exptl_crystal_size_min          0.185
_refine_diff_density_max         0.695
_refine_diff_density_min         -0.535
_refine_diff_density_rms         0.136
_refine_ls_abs_structure_details
;
 Refined as an inversion twin.
;
_refine_ls_abs_structure_Flack   0.05(3)
_refine_ls_extinction_coef       0.0008(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   1.031
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     40
_refine_ls_number_reflns         784
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.031
_refine_ls_R_factor_all          0.0214
_refine_ls_R_factor_gt           0.0185
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0124P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0366
_refine_ls_wR_factor_ref         0.0373
_reflns_Friedel_coverage         0.587
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                729
_reflns_number_total             784
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7ra05022d2.cif
_cod_data_source_block           22
_cod_original_cell_volume        518.20(19)
_cod_database_code               7228410
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              10917