β-Y~2~Si~2~O~7~, a new thortveitite-type compound, determined at 100 and 280K
Redhammer, Günther J.; Roth, Georg; .; Acta Crystallographica Section C 59 (2003) i103–i106; doi:10.1107/S0108270103018869

data_2013549
_publ_section_title
;
 \b-Y~2~Si~2~O~7~, a new thortveitite-type compound, determined at 100
 and 280K
;
_journal_issue                   10
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              i103
_journal_page_last               i106
_journal_paper_doi               10.1107/S0108270103018869
_journal_volume                  59
_journal_year                    2003
_chemical_formula_moiety         'O7 Si2 Y2'
_chemical_formula_sum            'O7 Si2 Y2'
_chemical_formula_weight         345.98
_chemical_name_systematic        'diyttrium disilicate'
_space_group_IT_number           12
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 101.730(18)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   6.8691(16)
_cell_length_b                   8.960(2)
_cell_length_c                   4.7168(11)
_cell_measurement_reflns_used    2329
_cell_measurement_temperature    280.0(10)
_cell_measurement_theta_max      32.1
_cell_measurement_theta_min      3.79
_cell_volume                     284.24(11)
_computing_cell_refinement       X-AREA
_computing_data_collection       'X-AREA (Stoe & Cie, 19??)'
_computing_data_reduction        'X-RED (Stoe & Cie, 1996)'
_computing_molecular_graphics    'DIAMOND (Brandenburg & Berndt, 1999)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_measured_fraction_theta_full 0.967
_diffrn_measured_fraction_theta_max 0.967
_diffrn_measurement_device       'two-circle goniometer'
_diffrn_measurement_device_type  'STOE IPDS 2'
_diffrn_measurement_method       'rotation method'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.039
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       6
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            1672
_diffrn_reflns_theta_full        32.18
_diffrn_reflns_theta_max         32.18
_diffrn_reflns_theta_min         3.79
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    20.719
_exptl_absorpt_correction_T_max  0.109
_exptl_absorpt_correction_T_min  0.054
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details
'via equivalents (X-SHAPE and X-RED; Stoe & Cie, 1996)'
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    4.042
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       cuboid
_exptl_crystal_F_000             324
_exptl_crystal_size_max          0.17
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.58
_refine_diff_density_min         -0.71
_refine_ls_extinction_coef       0.068(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 1997)'
_refine_ls_goodness_of_fit_ref   1.171
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     32
_refine_ls_number_reflns         520
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.171
_refine_ls_R_factor_gt           0.019
_refine_ls_shift/su_max          <0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0226P)^2^+0.3813P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.045
_reflns_number_gt                497
_reflns_number_total             520
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bc1023.cif
_cod_data_source_block           280K
_cod_depositor_comments
;
The following automatic conversions were performed:
'_geom_bond_publ_flag' value 'YES' changed to 'yes' according to
'/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29 (10
times).

'_geom_bond_publ_flag' value 'NO' changed to 'no' according to
'/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29 (7 times).

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

The following automatic conversions were performed:

'_geom_bond_publ_flag' value 'YES' changed to 'yes' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29 (10
times).

'_geom_bond_publ_flag' value 'NO' changed to 'no' according
to /home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary
named 'cif_core.dic' version 2.4.1 from 2010-06-29 (7
times).

'_geom_angle_publ_flag' value 'YES' changed to 'yes'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29 (19
times).

'_geom_angle_publ_flag' value 'NO' changed to 'no' according
to /home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary
named 'cif_core.dic' version 2.4.1 from 2010-06-29 (27 times).

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_cell_volume        284.26(12)
_cod_original_sg_symbol_H-M      'C 2/m'
_cod_database_code               2013549
_cod_database_fobs_code          2013549