Metal ion displacements in noncentrosymmetric chalcogenides La3Ga1.67S7, La3Ag0.6GaCh7 (Ch=S, Se), and La3MGaSe7 (M=Zn, Cd)
Iyer, Abishek K.; Yin, Wenlong; Rudyk, Brent W.; Lin, Xinsong; Nilges, Tom; Mar, Arthur; Journal of Solid State Chemistry 243 (2016) 221–231; doi:10.1016/j.jssc.2016.08.031

data_1561360
_publ_section_title
;
 Metal ion displacements in noncentrosymmetric chalcogenides La3Ga1.67S7,
 La3Ag0.6GaCh7 (Ch=S, Se), and La3MGaSe7 (M=Zn, Cd)
;
_journal_name_full               'Journal of Solid State Chemistry'
_journal_page_first              221
_journal_page_last               231
_journal_paper_doi               10.1016/j.jssc.2016.08.031
_journal_volume                  243
_journal_year                    2016
_chemical_absolute_configuration ad
_chemical_formula_structural     'La3 Ga1.67 S7'
_chemical_formula_sum            'Ga1.67 La3 S7'
_chemical_formula_weight         757.58
_chemical_name_common            'lanthanum gallium sulfide (3/1.67/7)'
_chemical_name_systematic        'lanthanum gallium sulfide (3/1.67/7)'
_space_group_crystal_system      hexagonal
_space_group_IT_number           173
_space_group_name_Hall           'P 6c'
_space_group_name_H-M_alt        'P 63'
_atom_sites_solution_hydrogens   .
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            2
_cell_length_a                   10.1772(8)
_cell_length_b                   10.1772(8)
_cell_length_c                   6.0648(5)
_cell_measurement_reflns_used    7083
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      33.05
_cell_measurement_theta_min      4.08
_cell_volume                     544.01(8)
_computing_cell_refinement       'Bruker SAINT 8.34A (Bruker, 2013)'
_computing_data_collection       'Bruker APEX 2 (Bruker, 2008)'
_computing_data_reduction        'Bruker SAINT 8.34A'
_computing_molecular_graphics    'ATOMS 5.1 (Dowty, 1999)'
_computing_publication_material  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker PLATFORM/SMART APEX II CCD'
_diffrn_measurement_method       '\w and \f scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0314
_diffrn_reflns_av_unetI/netI     0.0201
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            7993
_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         33.100
_diffrn_reflns_theta_min         2.311
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    16.892
_exptl_absorpt_correction_T_max  0.533
_exptl_absorpt_correction_T_min  0.383
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'SHELXL-2014/7 (Sheldrick, 2014)'
_exptl_crystal_colour            grey
_exptl_crystal_density_diffrn    4.625
_exptl_crystal_description       irregular
_exptl_crystal_F_000             670
_exptl_crystal_size_max          0.074
_exptl_crystal_size_mid          0.069
_exptl_crystal_size_min          0.061
_refine_diff_density_max         2.760
_refine_diff_density_min         -1.053
_refine_diff_density_rms         0.190
_refine_ls_abs_structure_details
;
 Refined as an inversion twin.
;
_refine_ls_abs_structure_Flack   -0.02(3)
_refine_ls_extinction_coef       0.0047(4)
_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   1.124
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     41
_refine_ls_number_reflns         1385
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.124
_refine_ls_R_factor_all          0.0220
_refine_ls_R_factor_gt           0.0204
_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^)+(0.0170P)^2^+1.2741P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0441
_refine_ls_wR_factor_ref         0.0448
_reflns_Friedel_coverage         0.851
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                1312
_reflns_number_total             1385
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            mmc7.cif
_cod_data_source_block           1
_cod_original_cell_volume        544.01(10)
_cod_database_code               1561360
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.368
_shelx_estimated_absorpt_t_max   0.426
_shelx_res_checksum              59969
_shelx_hkl_checksum              87395