New Ferroelectrics Based on Divalent Metal Ion Alum
Wen Zhang; Li-Zhuang Chen; Ren-Gen Xiong; Takayoshi Nakamura; Songping D. Huang; Journal of the American Chemical Society 131 (2009) 12544–12545; doi:10.1021/ja905399x

data_4105001
_publ_section_title
;
 New Ferroelectrics Based on Divalent Metal Ion Alum
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              12544
_journal_page_last               12545
_journal_paper_doi               10.1021/ja905399x
_journal_volume                  131
_journal_year                    2009
_chemical_formula_sum            'C6 H12 Cu D14 N2 O14 Se2'
_chemical_formula_weight         585.83
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 125.16(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.124(6)
_cell_length_b                   12.634(9)
_cell_length_c                   12.164(7)
_cell_measurement_temperature    298(2)
_cell_volume                     895.1(12)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_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  0.0631
_diffrn_reflns_av_sigmaI/netI    0.0652
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            8762
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.22
_exptl_absorpt_coefficient_mu    5.358
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.8339
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_density_diffrn    2.174
_exptl_crystal_F_000             570
_exptl_crystal_size_max          0.27
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.2
_refine_diff_density_max         2.094
_refine_diff_density_min         -2.253
_refine_diff_density_rms         0.228
_refine_ls_extinction_coef       0.040(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   1.185
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     129
_refine_ls_number_reflns         2022
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.185
_refine_ls_R_factor_all          0.1065
_refine_ls_R_factor_gt           0.0934
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0000P)^2^+32.3894P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2147
_refine_ls_wR_factor_ref         0.2199
_reflns_number_gt                1563
_reflns_number_total             2022
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja905399x_si_004.cif
_cod_data_source_block           shelxl
_cod_original_cell_volume        895.1(11)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4105001