Ternary Borides Cr2AlB2, Cr3AlB4, and Cr4AlB6: The First Members of the Series (CrB2)nCrAl with n = 1, 2, 3 and a Unifying Concept for Ternary Borides as MAB-Phases.
Ade, Martin; Hillebrecht, Harald; Inorganic chemistry 54 (2015) 6122–6135; doi:10.1021/acs.inorgchem.5b00049

data_4343332
_publ_section_title
;
 Ternary Borides Cr2AlB2, Cr3AlB4, and Cr4AlB6: The First Members of the
 Series (CrB2)nCrAl with n = 1, 2, 3 and a Unifying Concept for Ternary
 Borides as MAB-Phases.
;
_journal_issue                   13
_journal_name_full               'Inorganic chemistry'
_journal_page_first              6122
_journal_page_last               6135
_journal_paper_doi               10.1021/acs.inorgchem.5b00049
_journal_volume                  54
_journal_year                    2015
_chemical_formula_sum            'Al B6 Cr4'
_chemical_formula_weight         299.84
_chemical_name_systematic
;
 ?
;
_space_group_crystal_system      orthorhombic
_space_group_IT_number           65
_space_group_name_Hall           '-C 2 2'
_space_group_name_H-M_alt        'C m m m'
_symmetry_space_group_name_Hall  '-C 2 2'
_symmetry_space_group_name_H-M   'C m m m'
_audit_creation_method           SHELXL-2013
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   2.9517(4)
_cell_length_b                   21.280(3)
_cell_length_c                   3.0130(3)
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      35
_cell_measurement_theta_min      4
_cell_volume                     189.25(4)
_computing_cell_refinement       'Software for IPDS-II, Fa. Stoe'
_computing_data_collection       'Software for IPDS-II, Fa. Stoe'
_computing_data_reduction        'Software for IPDS-II, Fa. Stoe'
_computing_molecular_graphics    'Diamond (Crystal impact, 2005)'
_computing_publication_material  'SHELXL-97_(Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_details
; 
0 degree < omega < 180 degree
psi = 0
delta omega 2 degree
exposure time 360s 
;
_diffrn_measurement_device       '2-circle goniometer'
_diffrn_measurement_device_type  'STOE IPDS 2'
_diffrn_measurement_method       'rotation method'
_diffrn_radiation_collimation    '0.5 mm diameter, multiple pinhole'
_diffrn_radiation_monochromator  'plane graphite'
_diffrn_radiation_polarisn_norm  0
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_unetI/netI     0.0579
_diffrn_reflns_laue_measured_fraction_full 0.992
_diffrn_reflns_laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       34
_diffrn_reflns_limit_k_min       -34
_diffrn_reflns_limit_l_max       4
_diffrn_reflns_limit_l_min       -4
_diffrn_reflns_number            1874
_diffrn_reflns_point_group_measured_fraction_full 0.992
_diffrn_reflns_point_group_measured_fraction_max 0.996
_diffrn_reflns_theta_full        25.240
_diffrn_reflns_theta_max         34.624
_diffrn_reflns_theta_min         3.830
_diffrn_source
'sealed X-ray tube, 12 x 0.4 mm long-fine focus'
_diffrn_source_current           40
_diffrn_source_power             2.00
_diffrn_source_voltage           50
_exptl_absorpt_coefficient_mu    11.190
_exptl_absorpt_correction_T_max  0.299
_exptl_absorpt_correction_T_min  0.184
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'X-Red and X-SHAPE  (Stoe & Cie, 1999)'
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    5.262
_exptl_crystal_description       irregular_fragment
_exptl_crystal_F_000             278
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.05
_exptl_transmission_factor_max   0.299
_exptl_transmission_factor_min   0.184
_refine_diff_density_max         0.769
_refine_diff_density_min         -0.911
_refine_diff_density_rms         0.188
_refine_ls_extinction_coef       0.046(3)
_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   0.797
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     26
_refine_ls_number_reflns         278
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.797
_refine_ls_R_factor_all          0.0467
_refine_ls_R_factor_gt           0.0257
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0107P)^2^+1.1470P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0382
_refine_ls_wR_factor_ref         0.0413
_reflns_Friedel_coverage         0.000
_reflns_number_gt                208
_reflns_number_total             278
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            Cr4AlB6.cif
_cod_data_source_block           Cr4AlB6
_cod_depositor_comments
'Adding full bibliography for 4343328--4343335.cif.'
_cod_original_cell_volume        189.26(4)
_cod_database_code               4343332
_shelxl_version_number           2013-4
_shelx_res_checksum              30874
_shelx_hkl_checksum              42971