Discovery of chalcogenides structures and compositions using mixed fluxes
Zhou, Xiuquan; Kolluru, Venkata Surya Chaitanya; Xu, Wenqian; Wang, Luqing; Chang, Tieyan; Chen, Yu-Sheng; Yu, Lei; Wen, Jianguo; Chan, Maria K. Y.; Chung, Duck Young; Kanatzidis, Mercouri G.; Nature 612 (2022) 72–77; doi:10.1038/s41586-022-05307-7

data_1568159
_publ_section_title
;
 Discovery of chalcogenides structures and compositions using mixed fluxes
;
_journal_issue                   7938
_journal_name_full               Nature
_journal_page_first              72
_journal_page_last               77
_journal_paper_doi               10.1038/s41586-022-05307-7
_journal_volume                  612
_journal_year                    2022
_chemical_formula_moiety         '0.5(Cu20 K4 Se12)'
_chemical_formula_sum            'Cu10 K2 Se6'
_chemical_formula_weight         1187.36
_space_group_crystal_system      tetragonal
_space_group_IT_number           136
_space_group_name_Hall           '-P 4n 2n'
_space_group_name_H-M_alt        'P 42/m n m'
_atom_sites_solution_hydrogens   .
_atom_sites_solution_primary     dual
_audit_contact_author_name
;
;
_audit_creation_date             2021-06-18
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Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_cell_angle_alpha                90
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_cell_measurement_temperature    293(2)
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_cell_measurement_theta_min      7.1
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_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
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_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           MoK\a
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_diffrn_reflns_av_R_equivalents  0.0421
_diffrn_reflns_av_unetI/netI     0.1092
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_diffrn_reflns_limit_h_min       -11
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_diffrn_reflns_point_group_measured_fraction_full 0.995
_diffrn_reflns_point_group_measured_fraction_max 0.994
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         29.147
_diffrn_reflns_theta_min         3.527
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    32.431
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            silver
_exptl_crystal_density_diffrn    5.890
_exptl_crystal_description       needle
_exptl_crystal_F_000             1064
_refine_diff_density_max         0.976
_refine_diff_density_min         -1.255
_refine_diff_density_rms         0.339
_refine_ls_extinction_coef       0.00143(10)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2018/3 (Sheldrick 2018)'
_refine_ls_goodness_of_fit_ref   0.577
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
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_refine_ls_number_reflns         542
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_refine_ls_R_factor_all          0.0803
_refine_ls_R_factor_gt           0.0308
_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^)+(0.0288P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0555
_refine_ls_wR_factor_ref         0.0620
_reflns_Friedel_coverage         0.000
_reflns_Friedel_fraction_full    .
_reflns_Friedel_fraction_max     .
_reflns_number_gt                245
_reflns_number_total             542
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            XXV_KCu5Se3.cif
_cod_data_source_block           XXV
_cod_original_cell_volume        669.5(2)
_cod_database_code               1568159
_shelx_shelxl_version_number     2018/3
_olex2_refinement_description
;
;
_shelx_res_checksum              13167
_shelx_hkl_checksum              70276
_olex2_submission_special_instructions 'No special instructions were received'