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_4343334
_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 B2 Cr2'
_chemical_formula_weight         152.60
_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                   2.9373(3)
_cell_length_b                   11.0513(12)
_cell_length_c                   2.9675(3)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      30
_cell_measurement_theta_min      20
_cell_volume                     96.328(17)
_computing_cell_refinement       'Software for Cad4, Nonius'
_computing_data_collection       'Software for CAD4, Nonius'
_computing_data_reduction        'Software for Cad4, Nonius'
_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 0.969
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_details
; 
0.80 deggee +/- 0.50 tan theta
exposure time 60s 
;
_diffrn_measurement_device       '4-circle goniometer'
_diffrn_measurement_device_type  CAD4
_diffrn_measurement_method       omega_2theta_scan
_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     0.71069
_diffrn_reflns_av_R_equivalents  0.0372
_diffrn_reflns_av_unetI/netI     0.0265
_diffrn_reflns_laue_measured_fraction_full 0.969
_diffrn_reflns_laue_measured_fraction_max 0.994
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       0
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       6
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            1037
_diffrn_reflns_point_group_measured_fraction_full 0.969
_diffrn_reflns_point_group_measured_fraction_max 0.994
_diffrn_reflns_theta_full        25.240
_diffrn_reflns_theta_max         49.849
_diffrn_reflns_theta_min         3.687
_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    11.216
_exptl_absorpt_correction_T_max  0.644
_exptl_absorpt_correction_T_min  0.363
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'psi-scan_method with 15 reflections'
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    5.261
_exptl_crystal_description       flat_rod
_exptl_crystal_F_000             142
_exptl_crystal_size_max          0.1
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.025
_exptl_transmission_factor_max   0.644
_exptl_transmission_factor_min   0.363
_refine_diff_density_max         1.079
_refine_diff_density_min         -0.904
_refine_diff_density_rms         0.201
_refine_ls_extinction_coef       0.400(14)
_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   1.163
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     13
_refine_ls_number_reflns         323
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.163
_refine_ls_R_factor_all          0.0150
_refine_ls_R_factor_gt           0.0135
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0118P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0302
_refine_ls_wR_factor_ref         0.0304
_reflns_Friedel_coverage         0.000
_reflns_number_gt                307
_reflns_number_total             323
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            Cr2AlB2.cif
_cod_data_source_block           Cr2AlB2
_cod_depositor_comments
'Adding full bibliography for 4343328--4343335.cif.'
_cod_database_code               4343334
_shelxl_version_number           2013-4
_shelx_res_checksum              92303
_shelx_hkl_checksum              45196