On the structures of the rare-earth metal germanides from the series REAl1−xGe3 (RE = Nd, Sm, Gd, Tb, Dy, Ho; 0.6 < x < 0.9). A tale of vacancies at the Al sites and the concomitant structural modulations
Zhang, Jiliang; Liu, Yanyan; Shek, Chan Hung; Wang, Yingmin; Bobev, Svilen; Dalton Trans.  (2017) –; doi:10.1039/C7DT01977G

data_7043538
_publ_section_title
;
 On the structures of the rare-earth metal germanides from the series
 REAl1&#x2212;xGe3 (RE = Nd, Sm, Gd, Tb, Dy, Ho; 0.6 &lt; x &lt; 0.9). A
 tale of vacancies at the Al sites and the concomitant structural
 modulations
;
_journal_name_full               'Dalton Trans.'
_journal_paper_doi               10.1039/C7DT01977G
_journal_year                    2017
_chemical_formula_sum            'Al0.63 Ge6 Nd2'
_chemical_formula_weight         740.88
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           64
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-C 2ac 2'
_symmetry_space_group_name_H-M   'C m c e'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2017-05-15 deposited with the CCDC.
2017-06-15 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   8.5058(17)
_cell_length_b                   8.1356(17)
_cell_length_c                   20.999(4)
_cell_measurement_reflns_used    1497
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      30.36
_cell_measurement_theta_min      4.79
_cell_volume                     1453.1(5)
_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      200(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  0.0289
_diffrn_reflns_av_sigmaI/netI    0.0165
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            7768
_diffrn_reflns_theta_full        29.57
_diffrn_reflns_theta_max         29.57
_diffrn_reflns_theta_min         1.94
_exptl_absorpt_coefficient_mu    38.439
_exptl_absorpt_correction_T_max  0.6998
_exptl_absorpt_correction_T_min  0.3918
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            grey-silver
_exptl_crystal_density_diffrn    6.773
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       irregular
_exptl_crystal_F_000             2561
_exptl_crystal_size_max          0.06
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.02
_refine_diff_density_max         1.628
_refine_diff_density_min         -2.319
_refine_diff_density_rms         0.345
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.024
_refine_ls_matrix_type           full
_refine_ls_number_parameters     50
_refine_ls_number_reflns         1085
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.024
_refine_ls_R_factor_all          0.0452
_refine_ls_R_factor_gt           0.0234
_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^)+(0.0250P)^2^+32.5213P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0551
_refine_ls_wR_factor_ref         0.0654
_reflns_number_gt                651
_reflns_number_total             1085
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c7dt01977g2.cif
_cod_data_source_block           Nd_Cmca
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 4973 2017-02-22 13:04:09Z antanas 
;
_cod_original_cell_volume        1453.2(5)
_cod_original_sg_symbol_H-M      Cmca
_cod_database_code               7043538