Ternary K~2~Zn~5~As~4~-type pnictides Rb~2~Cd~5~As~4~ and Rb~2~Zn~5~Sb~4~, and the solid solution Rb~2~Cd~5~(As,Sb)~4~
He, Hua; Stoyko, Stanislav S.; Mar, Arthur; Bobev, Svilen; Acta Crystallographica Section C 69 (2013) 455–459; doi:10.1107/S010827011300766X

data_2018984
_publ_section_title
;
 Ternary K~2~Zn~5~As~4~-type pnictides Rb~2~Cd~5~As~4~ and
 Rb~2~Zn~5~Sb~4~, and the solid solution Rb~2~Cd~5~(As,Sb)~4~
;
_journal_coeditor_code           OV3027
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              455
_journal_page_last               459
_journal_paper_doi               10.1107/S010827011300766X
_journal_volume                  69
_journal_year                    2013
_chemical_formula_iupac          'Rb2 Cd5 As4'
_chemical_formula_structural     'Rb2 Cd5 As4'
_chemical_formula_sum            'As4 Cd5 Rb2'
_chemical_formula_weight         1032.62
_chemical_name_common            'Dirubidium pentacadmium tetraarsenide'
_chemical_name_systematic
;
Dirubidium pentacadmium tetraarsenide
;
_space_group_IT_number           63
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-C 2c 2'
_symmetry_space_group_name_H-M   'C m c m'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.432(4)
_cell_length_b                   7.587(3)
_cell_length_c                   12.507(4)
_cell_measurement_reflns_used    1019
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      25.67
_cell_measurement_theta_min      3.15
_cell_volume                     1179.7(7)
_computing_cell_refinement       'SMART (Bruker, 2002)'
_computing_data_collection       'SMART (Bruker, 2002)'
_computing_data_reduction        'SAINT (Bruker, 2002)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008<i>b</i>)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008<i>b</i>)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008<i>b</i>)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008<i>b</i>)'
_diffrn_ambient_temperature      200(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker SMART CCD area-detector'
_diffrn_measurement_method       '\f and \w'
_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  0.0558
_diffrn_reflns_av_sigmaI/netI    0.0270
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            7479
_diffrn_reflns_theta_full        27.71
_diffrn_reflns_theta_max         27.71
_diffrn_reflns_theta_min         3.15
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    28.136
_exptl_absorpt_correction_T_max  0.5397
_exptl_absorpt_correction_T_min  0.3990
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2008<i>a</i>)'
_exptl_crystal_colour            silver
_exptl_crystal_density_diffrn    5.814
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1784
_exptl_crystal_size_max          0.04
_exptl_crystal_size_mid          0.03
_exptl_crystal_size_min          0.03
_refine_diff_density_max         1.032
_refine_diff_density_min         -1.104
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.004
_refine_ls_matrix_type           full
_refine_ls_number_parameters     34
_refine_ls_number_reflns         754
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.004
_refine_ls_R_factor_all          0.0318
_refine_ls_R_factor_gt           0.0214
_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^)+(0.0180P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0406
_refine_ls_wR_factor_ref         0.0431
_reflns_number_gt                615
_reflns_number_total             754
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ov3027.cif
_cod_data_source_block           I
_cod_database_code               2018984
_cod_database_fobs_code          2018984