Two-dimensional incommensurately modulated structure of (Sr~0.13~Ca~0.87~)~2~CoSi~2~O~7~ crystals
Bagautdinov, B.; Hagiya, K.; Kusaka, K.; Ohmasa, M.; Iishi, K.; Acta Crystallographica Section B 56 (2000) 811–821; doi:10.1107/S0108768100006716

data_2102160
_publ_section_title
;
 Two-dimensional incommensurately modulated structure of
 (Sr~0.13~Ca~0.87~)~2~CoSi~2~O~7~ crystals
;
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              811
_journal_page_last               821
_journal_paper_doi               10.1107/S0108768100006716
_journal_volume                  56
_journal_year                    2000
_chemical_formula_iupac          '(Sr0.13 Ca0.87)2 Co1 Si2 O7'
_chemical_formula_sum            'Ca1.74 Co O7 Si2 Sr0.26'
_chemical_formula_weight         319.6
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P -4 2ab'
_symmetry_space_group_name_H-M   'P -4 21 m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   7.8743(4)
_cell_length_b                   7.8743(4)
_cell_length_c                   5.0417(2)
_cell_volume                     312.61(3)
_diffrn_measurement_device       CAD4
_diffrn_measurement_method       \w/2\q
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     .71073
_diffrn_reflns_theta_max         50.0
_diffrn_reflns_theta_min         1.5
_diffrn_standards_decay_%        '1.3, 1.5'
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    6.739
_exptl_absorpt_correction_T_max  .2733
_exptl_absorpt_correction_T_min  .2249
_exptl_absorpt_correction_type   analytical
_exptl_crystal_colour            blue
_exptl_crystal_density_meas      3.394
_exptl_crystal_F_000             311
_exptl_crystal_size_rad          .15
_refine_diff_density_max         2.59
_refine_diff_density_min         -2.94
_refine_ls_extinction_coef       .102492
_refine_ls_extinction_method     'B-C type 1 Lorentzian isotropic'
_refine_ls_goodness_of_fit_obs   2.34
_refine_ls_number_parameters     107
_refine_ls_number_reflns         1697
_refine_ls_R_factor_all          .0701
_refine_ls_R_factor_gt           .0701
_refine_ls_structure_factor_coef F
_refine_ls_weighting_scheme      unit
_refine_ls_wR_factor_all         .0524
_reflns_number_observed          1697
_reflns_number_total             8207
_reflns_observed_criterion       2.5
_cod_data_source_file            sn0002.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_refine_ls_weighting_scheme' value 'Unit' changed to 'unit' according to
'/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'Unit' changed to 'unit'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P-421m
_cod_original_formula_sum        'Ca1.74 Co1 O7 Si2 Sr0.26'
_cod_database_code               2102160