Layered Rare-Earth Gallium Antimonides REGaSb2 (RE= La-Nd, Sm)
Allison M. Mills; Arthur Mar; Journal of the American Chemical Society 123 (2001) 1151–1158; doi:10.1021/ja003705+

data_4115443
_publ_contact_author_address
; Department of Chemistry
  University of Alberta
  Edmonton, AB
  Canada  T6G 2G2
;
_publ_contact_author_email       arthur.mar@ualberta.ca
_publ_contact_author_fax         '(780) 492-8231'
_publ_contact_author_name        'Arthur Mar'
_publ_contact_author_phone       '(780) 492-5592'
_publ_section_title
;
 Layered Rare-Earth Gallium Antimonides REGaSb2 (RE= La-Nd, Sm)
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              1151
_journal_page_last               1158
_journal_paper_doi               10.1021/ja003705+
_journal_volume                  123
_journal_year                    2001
_chemical_formula_moiety         'Ga Sb2 Sm'
_chemical_formula_sum            'Ga Sb2 Sm'
_chemical_formula_weight         463.57
_chemical_name_common            'samarium gallium antimonide'
_chemical_name_systematic        'samarium gallium antimonide'
_space_group_IT_number           20
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'C 2c 2'
_symmetry_space_group_name_H-M   'C 2 2 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   4.3087(5)
_cell_length_b                   22.093(4)
_cell_length_c                   4.3319(4)
_cell_measurement_reflns_used    24
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      25
_cell_measurement_theta_min      13
_cell_volume                     412.36(10)
_computing_cell_refinement       'CAD4/PC (Enraf-Nonius)'
_computing_data_collection       'CAD4/PC (Enraf-Nonius)'
_computing_data_reduction        XCAD4
_computing_molecular_graphics    'ATOMS 4.0'
_computing_publication_material  'Bruker SHELXTL 5.1'
_computing_structure_refinement  'Bruker SHELXTL 5.1'
_computing_structure_solution    'Bruker SHELXTL 5.1'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Enraf-Nonius CAD4'
_diffrn_measurement_method       \q--2\q
_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  0.0763
_diffrn_reflns_av_sigmaI/netI    0.0451
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       35
_diffrn_reflns_limit_k_min       -35
_diffrn_reflns_limit_l_max       6
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            3582
_diffrn_reflns_theta_full        34.93
_diffrn_reflns_theta_max         34.93
_diffrn_reflns_theta_min         1.84
_diffrn_standards_interval_time  7200
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    33.213
_exptl_absorpt_correction_T_max  0.6535
_exptl_absorpt_correction_T_min  0.0761
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'Bruker SHELXTL 5.1'
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    7.467
_exptl_crystal_description       plate
_exptl_crystal_F_000             780
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.01
_refine_diff_density_max         3.316
_refine_diff_density_min         -3.524
_refine_diff_density_rms         0.516
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.54(6)
_refine_ls_extinction_coef       0.0060(4)
_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   1.055
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     23
_refine_ls_number_reflns         907
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.055
_refine_ls_R_factor_all          0.0318
_refine_ls_R_factor_gt           0.0293
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0308P)^2^+7.8140P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0722
_refine_ls_wR_factor_ref         0.0737
_reflns_number_gt                848
_reflns_number_total             907
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja0037052B_2.cif
_cod_data_source_block           c222
_cod_database_code               4115443