Laves-Phase Structural Changes in the System CaAl2-xMgx
Shahrad Amerioun; Sergei I. Simak; Ulrich Häussermann; Inorganic Chemistry 42 (2003) 1467–1474; doi:10.1021/ic020596m

data_4313238
_publ_section_title
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 Laves-Phase Structural Changes in the System CaAl2-xMgx
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_journal_name_full               'Inorganic Chemistry'
_journal_page_first              1467
_journal_page_last               1474
_journal_paper_doi               10.1021/ic020596m
_journal_volume                  42
_journal_year                    2003
_chemical_formula_sum            'Ca Mg2'
_chemical_formula_weight         88.7
_space_group_IT_number           194
_symmetry_cell_setting           hexagonal
_symmetry_space_group_name_Hall  '-P 6c 2c'
_symmetry_space_group_name_H-M   'P 63/m m c'
_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                120.00
_cell_formula_units_Z            4
_cell_length_a                   6.2613(5)
_cell_length_b                   6.2613(5)
_cell_length_c                   10.1573(10)
_cell_measurement_reflns_used    31
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      43.1
_cell_measurement_theta_min      11.9
_cell_volume                     344.86(5)
_computing_cell_refinement       'PIRUM (Werner & Ericsson, 1993)'
_computing_data_collection       'EXPOSE in IPDS (Stoe & Cie, 1997)'
_computing_data_reduction        'X-RED  (Stoe & Cie, 1997)'
_computing_molecular_graphics    'Atoms (Dowty, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 'area detector'
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Stoe IPDS (version 2.87)'
_diffrn_measurement_method       'f scan'
_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  0.0232
_diffrn_reflns_av_sigmaI/netI    0.0105
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            3024
_diffrn_reflns_theta_full        27.93
_diffrn_reflns_theta_max         27.93
_diffrn_reflns_theta_min         3.76
_diffrn_standards_interval_count 6.0
_exptl_absorpt_coefficient_mu    0.940
_exptl_absorpt_correction_T_max  0.8045
_exptl_absorpt_correction_T_min  0.6658
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'X-shape, (Stoe & Cie, 1997)'
_exptl_crystal_colour            silver
_exptl_crystal_density_diffrn    0.854
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'irregular shape'
_exptl_crystal_F_000             88
_exptl_crystal_size_max          0.03
_exptl_crystal_size_mid          0.02
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.221
_refine_diff_density_min         -0.168
_refine_diff_density_rms         0.038
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.187
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     10
_refine_ls_number_reflns         189
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.187
_refine_ls_R_factor_all          0.0150
_refine_ls_R_factor_gt           0.0109
_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^)+(0.0134P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0233
_refine_ls_wR_factor_ref         0.0238
_reflns_number_gt                155
_reflns_number_total             189
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic020596m_1.cif
_cod_data_source_block           CaMg2
_cod_depositor_comments
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The following automatic conversions were performed:

data name '_atom_site_symetry_multiplicity' was replaced with
'_atom_site_symmetry_multiplicity' as specified in the replacement
file 'data/replacement-values/replacement_tags.lst'.

Automatic conversion script
Id: cif_correct_tags 9268 2022-04-12 08:56:07Z antanas 
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_cod_original_cell_volume        344.85(5)
_cod_original_formula_sum        CaMg2
_cod_database_code               4313238