Incommensurately modulated structure of Zn<sub>4</sub>Si<sub>2</sub>O<sub>7</sub>(OH)<sub>2</sub>·H<sub>2</sub>O at high pressure.
Gajda, Roman; Sławiński, Wojciech; Poręba, Tomasz; Parafiniuk, Jan; Mezouar, Mohamed; Dera, Przemysław; Woźniak, Krzysztof; IUCrJ 12 (2025) –; doi:10.1107/S2052252524011060

data_1573360
_publ_section_title
;
 Incommensurately modulated structure of
 Zn<sub>4</sub>Si<sub>2</sub>O<sub>7</sub>(OH)<sub>2</sub>&#xb7;H<sub>2</sub>O
 at high pressure.
;
_journal_issue                   1
_journal_name_full               IUCrJ
_journal_paper_doi               10.1107/S2052252524011060
_journal_volume                  12
_journal_year                    2025
_chemical_formula_moiety         'O9 Si2 Zn4, O'
_chemical_formula_sum            'H4 O10 Si2 Zn4'
_chemical_formula_weight         481.69
_space_group_crystal_system      orthorhombic
_space_group_IT_number           34
_space_group_name_Hall           'P 2 -2n'
_space_group_name_H-M_alt        'P n n 2'
_audit_creation_date             2024-08-16
_audit_creation_method
;
Olex2 1.5
(compiled 2024.02.16 svn.r378c4104 for OlexSys, GUI svn.r6928)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   8.2199(6)
_cell_length_b                   10.6921(2)
_cell_length_c                   5.06030(10)
_cell_measurement_pressure       2330000
_cell_measurement_reflns_used    2102
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      19.8530
_cell_measurement_theta_min      2.7090
_cell_volume                     444.74(3)
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2018/3 (Sheldrick, 2015)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.498
_diffrn_measured_fraction_theta_max 0.349
_diffrn_measurement_device_type
'esperanto-CrysAlisPro-abstract goniometer imported esperanto images'
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.2229
_diffrn_reflns_av_R_equivalents  0.0177
_diffrn_reflns_av_unetI/netI     0.0326
_diffrn_reflns_Laue_measured_fraction_full 0.498
_diffrn_reflns_Laue_measured_fraction_max 0.349
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       29
_diffrn_reflns_limit_k_min       -31
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            5555
_diffrn_reflns_point_group_measured_fraction_full 0.461
_diffrn_reflns_point_group_measured_fraction_max 0.294
_diffrn_reflns_theta_full        7.686
_diffrn_reflns_theta_max         19.856
_diffrn_reflns_theta_min         1.598
_diffrn_source                   synchrotron
_exptl_absorpt_coefficient_mu    0.458
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.83353
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.43.105a (Rigaku Oxford Diffraction, 2024)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    3.597
_exptl_crystal_description       block
_exptl_crystal_F_000             464
_exptl_crystal_size_max          0.045
_exptl_crystal_size_mid          0.03
_exptl_crystal_size_min          0.02
_refine_diff_density_max         1.210
_refine_diff_density_min         -0.878
_refine_diff_density_rms         0.155
_refine_ls_abs_structure_details
;
 Classical Flack method preferred over Parsons because s.u. lower.
;
_refine_ls_abs_structure_Flack   -0.05(12)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.003
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     74
_refine_ls_number_reflns         3878
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.003
_refine_ls_R_factor_all          0.0541
_refine_ls_R_factor_gt           0.0326
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0701P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1013
_refine_ls_wR_factor_ref         0.1238
_reflns_Friedel_coverage         0.606
_reflns_Friedel_fraction_full    0.414
_reflns_Friedel_fraction_max     0.233
_reflns_number_gt                2167
_reflns_number_total             3878
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            fc5081.cif
_cod_data_source_block           2_33GPa_Pnn2_ESRF
_cod_database_code               1573360
_shelx_shelxl_version_number     2018/3
_olex2_refinement_description
;
;
_olex2_submission_special_instructions 'No special instructions were received'