K~0.12~Na~0.54~Ag~0.34~Nb~4~O~9~AsO~4~
Chérif, Saïda Fatma; Zid, Mohamed Faouzi; Driss, Ahmed; Acta Crystallographica Section E 67 (2011) i10–; doi:10.1107/S1600536811000055

data_2229148
_publ_section_title
;
 K~0.12~Na~0.54~Ag~0.34~Nb~4~O~9~AsO~4~
;
_journal_coeditor_code           MG2111
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              i10
_journal_paper_doi               10.1107/S1600536811000055
_journal_volume                  67
_journal_year                    2011
_chemical_formula_iupac          'K0.12 Na0.54 Ag0.34 Nb4 As O13'
_chemical_formula_moiety         'Ag0.34 As K0.12 Na0.54 Nb4 O13'
_chemical_formula_sum            'Ag0.34 As K0.12 Na0.54 Nb4 O13'
_chemical_formula_weight         708.82
_chemical_name_systematic
;
Potassium sodium silver tetraniobium nonaoxide arsenate
;
_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           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.412(2)
_cell_length_b                   10.452(2)
_cell_length_c                   10.009(4)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      15
_cell_measurement_theta_min      10
_cell_volume                     1089.2(5)
_computing_cell_refinement
'CAD-4 EXPRESS (Duisenberg, 1992; Mac\'i\<cek & Yordanov, 1992)'
_computing_data_collection
'CAD-4 EXPRESS (Duisenberg, 1992; Mac\'i\<cek & Yordanov, 1992)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'DIAMOND (Brandenburg, 1998)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Enraf--Nonius CAD-4'
_diffrn_measurement_method       \w/2\q
_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  0.0138
_diffrn_reflns_av_sigmaI/netI    0.0136
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -1
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -1
_diffrn_reflns_number            1550
_diffrn_reflns_theta_full        26.94
_diffrn_reflns_theta_max         26.94
_diffrn_reflns_theta_min         2.76
_diffrn_standards_decay_%        1.1
_diffrn_standards_interval_time  120
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    7.856
_exptl_absorpt_correction_T_max  0.452
_exptl_absorpt_correction_T_min  0.239
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   '(North  <i>et al.</i>, 1968)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    4.322
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1302
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.417
_refine_diff_density_min         -0.573
_refine_ls_extinction_coef       0.00226(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   1.139
_refine_ls_matrix_type           full
_refine_ls_number_parameters     72
_refine_ls_number_reflns         667
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.138
_refine_ls_R_factor_all          0.0143
_refine_ls_R_factor_gt           0.0134
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0164P)^2^+2.8925P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0343
_refine_ls_wR_factor_ref         0.0347
_reflns_number_gt                642
_reflns_number_total             667
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            mg2111.cif
_cod_data_source_block           I
_cod_database_code               2229148
_cod_database_fobs_code          2229148