Structure and properties of Gd3Ge4: the orthorhombic RE3Ge4 structures revisited (RE = Y, Tb-Tm).
Tobash, Paul H.; DiFilippo, Gary; Bobev, Svilen; Hur, Namjung; Thompson, Joe D.; Sarrao, John L.; Inorganic chemistry 46 (2007) 8690–8697; doi:10.1021/ic7009034

data_4339532
_publ_section_title
;
 Structure and properties of Gd3Ge4: the orthorhombic RE3Ge4 structures
 revisited (RE = Y, Tb-Tm).
;
_journal_issue                   21
_journal_name_full               'Inorganic chemistry'
_journal_page_first              8690
_journal_page_last               8697
_journal_paper_doi               10.1021/ic7009034
_journal_volume                  46
_journal_year                    2007
_chemical_formula_moiety         'Ge4 Y3'
_chemical_formula_sum            'Ge4 Y3'
_chemical_formula_weight         557.09
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           63
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-C 2c 2'
_symmetry_space_group_name_H-M   'C m c m'
_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                   4.0562(15)
_cell_length_b                   10.630(4)
_cell_length_c                   14.200(5)
_cell_measurement_reflns_used    2238
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      26.56
_cell_measurement_theta_min      2.87
_cell_volume                     612.3(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0488
_diffrn_reflns_av_sigmaI/netI    0.0336
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            2238
_diffrn_reflns_theta_full        26.56
_diffrn_reflns_theta_max         26.56
_diffrn_reflns_theta_min         2.87
_exptl_absorpt_coefficient_mu    47.316
_exptl_absorpt_correction_T_max  0.224
_exptl_absorpt_correction_T_min  0.213
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
SADABS (Sheldrick, 2003)
;
_exptl_crystal_colour            grey
_exptl_crystal_density_diffrn    6.044
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       irregular
_exptl_crystal_F_000             980
_exptl_crystal_size_max          0.04
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.04
_refine_diff_density_max         1.593
_refine_diff_density_min         -1.097
_refine_diff_density_rms         0.248
_refine_ls_extinction_coef       0.0028(2)
_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   1.060
_refine_ls_matrix_type           full
_refine_ls_number_parameters     28
_refine_ls_number_reflns         379
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.060
_refine_ls_R_factor_all          0.0314
_refine_ls_R_factor_gt           0.0247
_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^)+(0.0280P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0555
_refine_ls_wR_factor_ref         0.0582
_reflns_number_gt                327
_reflns_number_total             379
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic7009034-file003.cif
_cod_data_source_block           Y3Ge4
_cod_original_cell_volume        612.2(4)
_cod_database_code               4339532