data_2013549
_publ_section_title
;
 β-Y₂Si₂O₇, 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+0.001xFc²λ³/sin(2θ)]^-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/[σ²(Fo²)+(0.0226P)²+0.3813P] where P=(Fo²+2Fc²)/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>2σ(I)
_[local]_cod_data_source_file    bc1023.cif
_[local]_cod_data_source_block   280K
_[local]_cod_cif_authors_sg_H-M  'C 2/m'
_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_database_code               2013549
_cod_database_fobs_code          2013549
loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'-x, y, -z'
'x+1/2, y+1/2, z'
'-x+1/2, y+1/2, -z'
'-x, -y, -z'
'x, -y, z'
'-x+1/2, -y+1/2, -z'
'x+1/2, -y+1/2, z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
_atom_site_adp_type
_atom_site_calc_flag
_atom_site_refinement_flags
_atom_site_occupancy
_atom_site_disorder_assembly
_atom_site_disorder_group
_atom_site_type_symbol
Y 0.0 0.30621(3) 0.0 0.00683(12) Uani d S 1 . . Y
Si 0.21759(11) 0.0 0.41320(17) 0.00575(16) Uani d S 1 . . Si
O1 0.0 0.0 0.5 0.0179(7) Uani d S 1 . . O
O2 0.3794(3) 0.0 0.7153(5) 0.0083(4) Uani d S 1 . . O
O3 0.2357(2) 0.14921(18) 0.2226(3) 0.0093(3) Uani d . 1 . . O
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
Y 0.00596(15) 0.00616(15) 0.00831(16) 0.0 0.00131(8) 0.0
Si 0.0053(3) 0.0062(3) 0.0057(3) 0.0 0.0009(2) 0.0
O1 0.0083(13) 0.0286(19) 0.0178(16) 0.0 0.0050(11) 0.0
O2 0.0083(9) 0.0084(9) 0.0071(9) 0.0 -0.0009(6) 0.0
O3 0.0097(6) 0.0081(7) 0.0103(7) 0.0024(5) 0.0029(5) 0.0027(5)
loop_
_atom_type_symbol
_atom_type_description
_atom_type_scat_dispersion_real
_atom_type_scat_dispersion_imag
_atom_type_scat_source
O O 0.0106 0.006 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
Si Si 0.0817 0.0704 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
Y Y -2.7962 3.5667 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
loop_
_geom_angle_atom_site_label_1
_geom_angle_atom_site_label_2
_geom_angle_atom_site_label_3
_geom_angle_site_symmetry_1
_geom_angle_site_symmetry_3
_geom_angle
_geom_angle_publ_flag
O3 Y O3 2 . 102.13(9) yes
O3 Y O2 2 7_556 155.39(7) yes
O3 Y O2 . 7_556 93.54(6) yes
O3 Y O2 2 3_454 93.54(6) yes
O3 Y O2 . 3_454 155.39(7) yes
O2 Y O2 7_556 3_454 78.84(8) yes
O3 Y O3 2 7 117.13(7) yes
O3 Y O3 . 7 76.19(6) yes
O2 Y O3 7_556 7 84.82(7) yes
O2 Y O3 3_454 7 79.81(7) yes
O3 Y O3 2 8_455 76.19(6) yes
O3 Y O3 . 8_455 117.13(7) yes
O2 Y O3 7_556 8_455 79.81(7) yes
O2 Y O3 3_454 8_455 84.82(7) yes
O3 Y O3 7 8_455 160.08(8) yes
O3 Y Y 2 5_565 128.93(4) no
O3 Y Y . 5_565 128.93(4) no
O2 Y Y 7_556 5_565 39.42(4) no
O2 Y Y 3_454 5_565 39.42(4) no
O3 Y Y 7 5_565 80.04(4) no
O3 Y Y 8_455 5_565 80.04(4) no
O3 Y Y 2 7_455 38.79(4) no
O3 Y Y . 7_455 115.19(5) no
O2 Y Y 7_556 7_455 117.03(6) no
O2 Y Y 3_454 7_455 88.87(6) no
O3 Y Y 7 7_455 153.10(4) no
O3 Y Y 8_455 7_455 37.40(4) no
Y Y Y 5_565 7_455 106.347(10) no
O3 Y Y 2 7 115.19(5) no
O3 Y Y . 7 38.79(4) no
O2 Y Y 7_556 7 88.87(6) no
O2 Y Y 3_454 7 117.03(6) no
O3 Y Y 7 7 37.40(4) no
O3 Y Y 8_455 7 153.10(4) no
Y Y Y 5_565 7 106.347(10) no
Y Y Y 7_455 7 147.307(19) no
O2 Si O1 . . 106.25(10) yes
O2 Si O3 . 6 111.70(7) yes
O1 Si O3 . 6 108.40(6) yes
O2 Si O3 . . 111.70(7) yes
O1 Si O3 . . 108.40(6) yes
O3 Si O3 6 . 110.21(12) yes
Si O1 Si . 5_556 180.000(13) yes
Si O2 Y . 7_556 129.01(4) no
Si O2 Y . 3_546 129.01(4) no
Y O2 Y 7_556 3_546 101.16(8) no
Si O3 Y . . 130.17(9) no
Si O3 Y . 7 123.22(8) no
Y O3 Y . 7 103.81(6) no
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_site_symmetry_2
_geom_bond_distance
_geom_bond_publ_flag
Y O3 2 2.2386(15) yes
Y O3 . 2.2386(15) yes
Y O2 7_556 2.2479(14) yes
Y O2 3_454 2.2479(14) yes
Y O3 7 2.3091(17) yes
Y O3 8_455 2.3091(17) yes
Y Y 5_565 3.4729(10) no
Y Y 7_455 3.5792(8) no
Y Y 7 3.5792(8) no
Si O2 . 1.619(2) yes
Si O1 . 1.6280(9) yes
Si O3 6 1.6301(17) yes
Si O3 . 1.6301(17) yes
O1 Si 5_556 1.6280(9) no
O2 Y 7_556 2.2479(14) no
O2 Y 3_546 2.2479(14) no
O3 Y 7 2.3091(17) no
