Single crystal growth and structure analysis of type-I (Na/Sr)‒(Ga/Si) quaternary clathrates
Urushiyama, Hironao; Morito, Haruhiko; Yamane, Hisanori; RSC Advances 9 (2019) 14586–; doi:10.1039/C9RA01489F

data_7232769
_publ_section_title
;
 Single crystal growth and structure analysis of type-I (Na/Sr)--(Ga/Si)
 quaternary clathrates
;
_journal_issue                   26
_journal_name_full               'RSC Advances'
_journal_page_first              14586
_journal_paper_doi               10.1039/C9RA01489F
_journal_volume                  9
_journal_year                    2019
_chemical_formula_moiety         'Ga8.40 Na4.20 Si37.60 Sr3.80'
_chemical_formula_sum            'Ga8.4 Na4.2 Si37.6 Sr3.8'
_chemical_formula_weight         2071.35
_chemical_name_common            'Type I silicon-gallium clathrate'
_chemical_name_systematic        'sodium strontium gallium silicon'
_space_group_crystal_system      cubic
_space_group_IT_number           223
_space_group_name_Hall           '-P 4n 2 3'
_space_group_name_H-M_alt        'P m -3 n'
_symmetry_space_group_name_Hall  '-P 4n 2 3'
_symmetry_space_group_name_H-M   'P m -3 n'
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2019-02-21 deposited with the CCDC.    2019-04-29 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            1
_cell_length_a                   10.3747(3)
_cell_length_b                   10.3747(3)
_cell_length_c                   10.3747(3)
_cell_measurement_reflns_used    5291
_cell_measurement_temperature    302(2)
_cell_measurement_theta_max      28.656
_cell_measurement_theta_min      2.777
_cell_volume                     1116.67(6)
_computing_cell_refinement       'APEX3 v2015.9-0 (Bruker AXS)'
_computing_data_collection       'APEX3 v2015.9-0 (Bruker AXS)'
_computing_data_reduction        'APEX3 v2015.9-0 (Bruker AXS)'
_computing_molecular_graphics    'VESTA v3.3.2 (Momma & Izumi, 2011)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      302(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Burker, D8 QUEST'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0310
_diffrn_reflns_av_unetI/netI     0.0141
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            3777
_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         28.656
_diffrn_reflns_theta_min         2.777
_diffrn_source                   'micro focus sealed tube'
_exptl_absorpt_coefficient_mu    10.544
_exptl_absorpt_correction_T_max  0.7472
_exptl_absorpt_correction_T_min  0.5520
_exptl_absorpt_correction_type   'Numerical Mu From Formula'
_exptl_absorpt_process_details
;
SADABS-2016/2 - Bruker AXS area detector scaling and absorption correction
;
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    3.080
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             977
_exptl_crystal_size_max          0.183
_exptl_crystal_size_mid          0.174
_exptl_crystal_size_min          0.141
_refine_diff_density_max         0.261
_refine_diff_density_min         -0.239
_refine_diff_density_rms         0.062
_refine_ls_extinction_coef       0.0013(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   1.191
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     21
_refine_ls_number_reflns         284
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.189
_refine_ls_R_factor_all          0.0125
_refine_ls_R_factor_gt           0.0113
_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^+0.2629P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0283
_refine_ls_wR_factor_ref         0.0287
_reflns_Friedel_coverage         0.000
_reflns_number_gt                269
_reflns_number_total             284
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9ra01489f1.cif
_cod_data_source_block           Sr_C_2_0m_a
_cod_original_cell_volume        1116.67(10)
_cod_original_formula_sum        'Ga8.40 Na4.20 Si37.60 Sr3.80'
_cod_database_code               7232769
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.249
_shelx_estimated_absorpt_t_max   0.318
_shelx_res_checksum              60235