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_7228407
_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 Se4 Si'
_chemical_formula_weight         608.35
_space_group_crystal_system      trigonal
_space_group_IT_number           154
_space_group_name_Hall           'P 32 2"'
_space_group_name_H-M_alt        'P 32 2 1'
_symmetry_space_group_name_Hall  'P 32 2"'
_symmetry_space_group_name_H-M   'P 32 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                   6.4188(19)
_cell_length_b                   6.4188(19)
_cell_length_c                   16.083(10)
_cell_measurement_reflns_used    937
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.08
_cell_measurement_theta_min      3.67
_cell_volume                     573.9(4)
_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  0.0525
_diffrn_reflns_av_unetI/netI     0.0443
_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       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            3463
_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         27.295
_diffrn_reflns_theta_min         3.665
_diffrn_source                   'sealed tube'
_exptl_absorpt_coefficient_mu    29.673
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.4958
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    5.281
_exptl_crystal_description       block
_exptl_crystal_F_000             792
_exptl_crystal_size_max          0.133
_exptl_crystal_size_mid          0.097
_exptl_crystal_size_min          0.043
_refine_diff_density_max         0.846
_refine_diff_density_min         -0.809
_refine_diff_density_rms         0.207
_refine_ls_abs_structure_details
;
 Refined as an inversion twin.
;
_refine_ls_abs_structure_Flack   0.07(4)
_refine_ls_extinction_coef       0.0016(2)
_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   1.008
_refine_ls_matrix_type           full
_refine_ls_number_parameters     40
_refine_ls_number_reflns         869
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.008
_refine_ls_R_factor_all          0.0310
_refine_ls_R_factor_gt           0.0264
_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^)+(0.0129P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0437
_refine_ls_wR_factor_ref         0.0449
_reflns_Friedel_coverage         0.597
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                793
_reflns_number_total             869
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7ra05022d2.cif
_cod_data_source_block           33
_cod_original_cell_volume        573.9(5)
_cod_database_code               7228407
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              91539