Crystal structure of bismuth gallium aluminium oxide, Bi2(GaxAl1‒x)4O9, x = 0.4, 0.6, 0.8
Tapas Debnath; Claus H. Rüscher; Zeitschrift für Kristallographie - New Crystal Structures 225 (2010) 1–; doi:

data_8103040
_publ_section_title
;
 Crystal structure of bismuth gallium aluminium oxide,
 Bi2(GaxAl1--x)4O9, x = 0.4, 0.6, 0.8
;
_journal_issue                   1
_journal_name_full
'Zeitschrift f\"ur Kristallographie - New Crystal Structures'
_journal_page_first              1
_journal_volume                  225
_journal_year                    2010
_chemical_compound_source        synthetic
_chemical_formula_analytical     Bi2Ga2.346Al1.654O9
_chemical_formula_moiety         Bi2Ga2.4Al1.6O9
_chemical_formula_structural     Bi2(Ga0.6Al0.4)4O9
_chemical_formula_sum            'Al1.6 Bi2 Ga2.4 O9'
_chemical_formula_weight         772.457
_chemical_melting_point          ?
_chemical_name_structure_type    'bismuth gallium aluminium oxide'
_chemical_name_systematic
;
Bismuth gallium aluminium oxide (2/2.4/1.6/9) (mullite type) 
;
_space_group_IT_number           55
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      55
_symmetry_space_group_name_Hall  '-P 2 2ab'
_symmetry_space_group_name_H-M   'P b a m'
_atom_type_scat_source           'TOPAS 4.2 (Bruker AXS GmbH, Karlsruhe)'
_audit_creation_method           'manual editing'
_cell_angle_alpha                90.000
_cell_angle_beta                 90.000
_cell_angle_gamma                90.000
_cell_formula_units_Z            2
_cell_length_a                   7.83752(8)
_cell_length_b                   8.20096(8)
_cell_length_c                   5.79475(6)
_cell_measurement_reflns_used    186
_cell_measurement_temperature    293(2)
_cell_volume                     372.459(7)
_computing_cell_refinement       'TOPAS 4.2'
_computing_data_collection       'Stoe WinXPow software'
_computing_molecular_graphics    'Diamond 3.2'
_computing_structure_refinement  'TOPAS 4.2'
_diffrn_detector                 'Stoe linear PSD'
_diffrn_measurement_device       'Stoe STADI P'
_diffrn_measurement_method       'transmission, Debye-Scherrer mode'
_diffrn_radiation_monochromator  Ge(111)
_diffrn_radiation_probe          x-ray
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           'Co K\a'
_diffrn_radiation_wavelength     1.78896
_exptl_absorpt_coefficient_mu    24.8
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    6.87(1)
_pd_calc_method                  'Rietveld Refinement'
_pd_meas_2theta_range_inc        0.02
_pd_meas_2theta_range_max        114.98
_pd_meas_2theta_range_min        10.00
_pd_meas_number_of_points        5250
_pd_proc_2theta_range_inc        0.02
_pd_proc_2theta_range_max        114.98
_pd_proc_2theta_range_min        10.00
_pd_proc_ls_prof_R_factor        0.057
_pd_proc_ls_prof_wR_expected     0.020
_pd_proc_ls_prof_wR_factor       0.081
_pd_proc_number_of_points        5250
_refine_ls_goodness_of_fit_all   4.48
_refine_ls_number_parameters     29
_reflns_d_resolution_high        5.79475
_reflns_d_resolution_low         1.06191
_reflns_limit_h_max              7
_reflns_limit_h_min              0
_reflns_limit_k_max              7
_reflns_limit_k_min              0
_reflns_limit_l_max              5
_reflns_limit_l_min              0
_reflns_number_observed          186
_cod_data_source_file            710028.cff
_cod_data_source_block           Bi2Ga2.4Al1.6O9
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value 'not measured' was changed to '?' -
the value is undefined or not given.

Automatic conversion script
Id: cif_fix_values 1569 2011-02-09 13:29:24Z adriana 
;
_cod_original_cell_volume        372.46(1)
_cod_original_sg_symbol_H-M      Pbam
_cod_original_formula_sum        Bi2Ga2.4Al1.6O9
_cod_database_code               8103040
_cell_measurement_2theta_min     10.00
_cell_measurement_2theta_max     114.98
_pd_proc_ls_prof_r_factor_on_i   0.031