Synthesis, structure, and optical properties of the quaternary diamond-like compounds I2‒II‒IV‒VI4 (I=Cu; II=Mg; IV=Si, Ge; VI=S, Se)
Liu, Bin-Wen; Zhang, Ming-Jian; Zhao, Zhong-Yan; Zeng, Hui-Yi; Zheng, Fa-Kun; Guo, Guo-Cong; Huang, Jin-Shun; Journal of Solid State Chemistry 204 (2013) 251–256; doi:10.1016/j.jssc.2013.05.039

data_1562595
_publ_section_title
;
 Synthesis, structure, and optical properties of the quaternary
 diamond-like compounds I2--II--IV--VI4 (I=Cu; II=Mg; IV=Si, Ge; VI=S, Se)
;
_journal_name_full               'Journal of Solid State Chemistry'
_journal_page_first              251
_journal_page_last               256
_journal_paper_doi               10.1016/j.jssc.2013.05.039
_journal_volume                  204
_journal_year                    2013
_chemical_formula_moiety         Cu2MgSiSe4
_chemical_formula_sum            'Cu2 Mg Se4 Si'
_chemical_formula_weight         495.32
_chemical_name_common            Cu2MgSiSe4
_space_group_IT_number           31
_space_group_name_Hall           'P 2ac -2'
_space_group_name_H-M_alt        'P m n 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_H-M   'P m n 21'
_atom_sites_solution_hydrogens   none
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.953(5)
_cell_length_b                   6.797(4)
_cell_length_c                   6.507(4)
_cell_measurement_reflns_used    1045
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.5049
_cell_measurement_theta_min      2.9970
_cell_volume                     351.7(4)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2008)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 28.5714
_diffrn_measured_fraction_theta_full 0.984
_diffrn_measured_fraction_theta_max 0.984
_diffrn_measurement_device_type  'Rigaku Saturn 70 CCD'
_diffrn_measurement_method       CCD_Profile_fitting
_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  0.0771
_diffrn_reflns_av_sigmaI/netI    0.0642
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            2242
_diffrn_reflns_theta_full        25.44
_diffrn_reflns_theta_max         25.44
_diffrn_reflns_theta_min         3.94
_exptl_absorpt_coefficient_mu    26.879
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.4602
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            'Dark red'
_exptl_crystal_density_diffrn    4.676
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             440
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.714
_refine_diff_density_min         -1.062
_refine_diff_density_rms         0.210
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.00(4)
_refine_ls_extinction_coef       0.0037(10)
_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   1.019
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     45
_refine_ls_number_reflns         697
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.018
_refine_ls_R_factor_all          0.0368
_refine_ls_R_factor_gt           0.0310
_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^)+(0.0100P)^2^+1.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0653
_refine_ls_wR_factor_ref         0.0665
_reflns_number_gt                665
_reflns_number_total             697
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            JSSC-2013-204-251.cif
_cod_data_source_block           Cu2MgSiSe4
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_chemical_melting_point' value 'not measured' was changed
to '?' -- the value is undefined or not given.

data item '_exptl_absorpt_correction_type' value 'Multi-scan' was
changed to 'multi-scan' in accordance with the built-in table derived
from the CIF Core dictionary named 'cif_core.dic' version 2.4.5 last
updated on 2014-11-21.

data item '_symmetry_cell_setting' value 'Orthorhombic' was changed
to 'orthorhombic' in accordance with the built-in table derived from
the CIF Core dictionary named 'cif_core.dic' version 2.4.5 last
updated on 2014-11-21.

data item '_exptl_crystal_density_meas' value 'not measured' was
changed to '?' -- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 8369 2020-08-20 11:38:08Z andrius 
;
_cod_original_cell_volume        351.8(4)
_cod_original_sg_symbol_H-M      Pmn2(1)
_cod_database_code               1562595