#------------------------------------------------------------------------------
#$Date: 2011-01-02 20:00:31 +0000 (Sun, 02 Jan 2011) $
#$Revision: 5310 $
#$URL: svn://www.crystallography.net/cod/cif/2/2102160.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided by IUCr Journals, http://journals.iucr.org/.
#
# The file may be used within the scientific community so long as
# proper attribution is given to the journal article from which the
# data were obtained.
#
data_2102160
loop_
_publ_author_name
'Bagautdinov, B.'
'Hagiya, K.'
'Kusaka, K.'
'Ohmasa, M.'
'Iishi, K.'
_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_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-421m
_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
_[local]_cod_data_source_file    sn0002.cif
_[local]_cod_chemical_formula_sum_orig 'Ca1.74 Co1 O7 Si2 Sr0.26'
_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 
;
_cod_database_code               2102160
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Sr .0199(2) .0199(2) .0100(2) .0089(2) .00150(10) -.00150(10)
Ca .0199(2) .0199(2) .0100(2) .0089(2) .00150(10) -.00150(10)
Co .01090(10) .01090(10) .01090(10) 0 0 0
Si .0112(2) .0112(2) .0076(2) .0014(2) .00000(10) .00000(10)
O1 .0450(16) .0450(16) .0070(9) .0330(16) 0 0
O2 .0303(8) .0303(8) .0073(7) .0140(10) -.0017(5) .0017(5)
O3 .0420(10) .0155(6) .0141(8) -.0120(7) .0064(8) -.0014(6)
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
_atom_site_occupancy
_atom_site_type_symbol
Sr .33234 .16766 .5058 .01645 .128 Sr
Ca .33234(4) .16766(4) .50580(10) .01845(8) .872(3) Ca
Co 0 0 0 .01184(7) 1 Co
Si .13915(7) .36085(7) .93820(10) .01130(10) 1 Si
O1 0 .5 .8254(6) .0354(8) 1 O
O2 .1401(2) .3599(2) .2547(4) .0244(4) 1 O
O3 .0798(3) .1894(2) .7863(3) .0289(5) 1 O
loop_
_atom_type_symbol
_atom_type_scat_dispersion_real
_atom_type_scat_dispersion_imag
_atom_type_scat_source
Sr -1.531 3.250 International_Tables_Vol_C
Ca .226 .306 International_Tables_Vol_C
Co .349 .972 International_Tables_Vol_C
Si .082 .070 International_Tables_Vol_C
O .011 .006 International_Tables_Vol_C