Synthesis, Crystal and Electronic Structures, and Properties of the New Pnictide Semiconductors A2CdPn2 (A= Ca, Sr, Ba, Eu;Pn= P, As)
Jian Wang; Min Yang; Ming-Yan Pan; Sheng-Qing Xia; Xu-Tang Tao; Hua He; Gregory Darone; Svilen Bobev; Inorganic Chemistry 50 (2011) 8020–8027; doi:10.1021/ic200286t

data_4326002
_publ_section_title
;
 Synthesis, Crystal and Electronic Structures, and Properties of the New
 Pnictide Semiconductors A2CdPn2 (A= Ca, Sr, Ba, Eu;Pn= P, As)
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              8020
_journal_page_last               8027
_journal_paper_doi               10.1021/ic200286t
_journal_volume                  50
_journal_year                    2011
_chemical_formula_sum            'As2 Ca2 Cd'
_chemical_formula_weight         342.40
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           36
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'C 2c -2'
_symmetry_space_group_name_H-M   'C m c 21'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   4.3163(5)
_cell_length_b                   16.5063(19)
_cell_length_c                   7.1418(8)
_cell_measurement_reflns_used    654
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      27.24
_cell_measurement_theta_min      2.47
_cell_volume                     508.83(10)
_computing_cell_refinement       'APEX2 Software Suite (Bruker,2005)'
_computing_data_collection       'APEX2 Software Suite (Bruker,2005)'
_computing_data_reduction        'APEX2 Software Suite (Bruker,2005)'
_computing_molecular_graphics    'SHELXTL (Bruker, 1997)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_detector_area_resol_mean 8.3
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type
'Bruker APEX2 CCD area-detector diffractometer'
_diffrn_measurement_method       '\w scans'
_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  0.0316
_diffrn_reflns_av_sigmaI/netI    0.0309
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            2915
_diffrn_reflns_theta_full        27.24
_diffrn_reflns_theta_max         27.24
_diffrn_reflns_theta_min         2.47
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    19.024
_exptl_absorpt_correction_T_max  0.5991
_exptl_absorpt_correction_T_min  0.5166
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'APEX2 Software Suite (Bruker,2005)'
_exptl_crystal_colour            Black
_exptl_crystal_density_diffrn    4.470
_exptl_crystal_description       Needle
_exptl_crystal_F_000             616
_exptl_crystal_size_max          0.04
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.682
_refine_diff_density_min         -0.803
_refine_diff_density_rms         0.209
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.043(15)
_refine_ls_extinction_coef       0.00457(19)
_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   0.993
_refine_ls_matrix_type           full
_refine_ls_number_parameters     33
_refine_ls_number_reflns         654
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.993
_refine_ls_R_factor_all          0.0175
_refine_ls_R_factor_gt           0.0165
_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^)+(0.0063P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0290
_refine_ls_wR_factor_ref         0.0292
_reflns_number_gt                630
_reflns_number_total             654
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic200286t_si_001_2.cif
_cod_data_source_block           2
_cod_original_sg_symbol_H-M      'C m c 21 '
_cod_database_code               4326002