Lead-free hybrid ferroelectric material based on formamidine: [NH2CHNH2]3Bi2I9
Szklarz, Przemysław; Gągor, Anna; Jakubas, Ryszard; Zieliński, Piotr; Piecha-Bisiorek, Anna; Cichos, Jakub; Karbowiak, Mirosław; Bator, Grażyna; Ciżman, Agnieszka; Journal of Materials Chemistry C 7 (2019) 3003–; doi:10.1039/C8TC06458J

data_7237622
_publ_section_title
;
 Lead-free hybrid ferroelectric material based on formamidine:
 [NH2CHNH2]3Bi2I9
;
_journal_issue                   10
_journal_name_full               'Journal of Materials Chemistry C'
_journal_page_first              3003
_journal_paper_doi               10.1039/C8TC06458J
_journal_volume                  7
_journal_year                    2019
_chemical_formula_sum            'C3 H15 Bi2 I9 N6'
_chemical_formula_weight         1695.27
_space_group_crystal_system      hexagonal
_space_group_IT_number           186
_space_group_name_Hall           'P 6c -2c'
_space_group_name_H-M_alt        'P 63 m c'
_atom_sites_solution_hydrogens   difmap
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2018-07-14 deposited with the CCDC.
2019-02-04 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            2
_cell_length_a                   8.7119(2)
_cell_length_b                   8.7119(2)
_cell_length_c                   22.0141(9)
_cell_measurement_reflns_used    4165
_cell_measurement_temperature    219.8(4)
_cell_measurement_theta_max      25.5570
_cell_measurement_theta_min      2.8970
_cell_volume                     1446.96(8)
_computing_cell_refinement       'CrysAlisPro 1.171.38.43 (Rigaku OD, 2015)'
_computing_data_collection       'CrysAlisPro 1.171.38.43 (Rigaku OD, 2015)'
_computing_data_reduction        'CrysAlisPro 1.171.38.43 (Rigaku OD, 2015)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      219.8(4)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 10.6249
_diffrn_detector_type            Atlas
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'Xcalibur, Atlas'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0400
_diffrn_reflns_av_unetI/netI     0.0186
_diffrn_reflns_Laue_measured_fraction_full 0.991
_diffrn_reflns_Laue_measured_fraction_max 0.991
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            10697
_diffrn_reflns_point_group_measured_fraction_full 0.992
_diffrn_reflns_point_group_measured_fraction_max 0.992
_diffrn_reflns_theta_full        25.651
_diffrn_reflns_theta_max         25.651
_diffrn_reflns_theta_min         3.274
_diffrn_source                   'fine-focus sealed X-ray tube'
_diffrn_source_type              'Enhance (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    21.746
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.62476
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.38.43 (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    3.891
_exptl_crystal_description       prism
_exptl_crystal_F_000             1436
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.909
_refine_diff_density_min         -0.553
_refine_diff_density_rms         0.116
_refine_ls_abs_structure_details
;
 Refined as an inversion twin.
;
_refine_ls_abs_structure_Flack   0.50(4)
_refine_ls_extinction_coef       0.0016(2)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   1.257
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     43
_refine_ls_number_reflns         1114
_refine_ls_number_restraints     8
_refine_ls_restrained_S_all      1.252
_refine_ls_R_factor_all          0.0406
_refine_ls_R_factor_gt           0.0340
_refine_ls_shift/su_max          0.048
_refine_ls_shift/su_mean         0.014
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0352P)^2^+4.0862P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0851
_refine_ls_wR_factor_ref         0.0877
_reflns_Friedel_coverage         0.944
_reflns_Friedel_fraction_full    0.993
_reflns_Friedel_fraction_max     0.993
_reflns_number_gt                995
_reflns_number_total             1114
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8tc06458j2.cif
_cod_data_source_block           P63mc
_cod_original_cell_volume        1446.96(9)
_cod_database_code               7237622
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              21248