Hydrothermal synthesis of new rare earth silicate fluorides: A novel class of polar materials
McMillen, Colin D.; Emirdag-Eanes, Mehtap; Stritzinger, Jared T.; Kolis, Joseph W.; Journal of Solid State Chemistry 195 (2012) 155–160; doi:10.1016/j.jssc.2012.02.057

data_1562918
_publ_section_title
;
 Hydrothermal synthesis of new rare earth silicate fluorides: A novel
 class of polar materials
;
_journal_name_full               'Journal of Solid State Chemistry'
_journal_page_first              155
_journal_page_last               160
_journal_paper_doi               10.1016/j.jssc.2012.02.057
_journal_volume                  195
_journal_year                    2012
_chemical_formula_sum            'F2 Li O8 Si2 Y3'
_chemical_formula_weight         495.85
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   none
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 131.13(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.651(4)
_cell_length_b                   4.8868(10)
_cell_length_c                   11.625(2)
_cell_measurement_reflns_used    1985
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      26.7517
_cell_measurement_theta_min      3.0646
_cell_volume                     755.3(4)
_computing_cell_refinement       'CrystalClear (Rigaku/MSC, 1999)'
_computing_data_collection       'CrystalClear (Rigaku/MSC, 1999)'
_computing_data_reduction        'CrystalClear (Rigaku/MSC, 1999)'
_computing_molecular_graphics    'SHELXTL (Bruker-AXS, 1999)'
_computing_publication_material  'SHELXTL (Bruker-AXS, 1999)'
_computing_structure_refinement  'SHELXTL (Bruker-AXS, 1999)'
_computing_structure_solution    'SHELXTL (Bruker-AXS, 1999)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 14.6199
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Rigaku AFC8S'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0819
_diffrn_reflns_av_sigmaI/netI    0.0481
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            3045
_diffrn_reflns_theta_full        25.02
_diffrn_reflns_theta_max         25.02
_diffrn_reflns_theta_min         3.06
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    23.243
_exptl_absorpt_correction_T_max  0.5423
_exptl_absorpt_correction_T_min  0.1185
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'REQAB, CrystalClear'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    4.361
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'diamond plate'
_exptl_crystal_F_000             920
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.03
_refine_diff_density_max         1.831
_refine_diff_density_min         -1.575
_refine_diff_density_rms         0.301
_refine_ls_extinction_coef       0.0018(6)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.121
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     76
_refine_ls_number_reflns         658
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.121
_refine_ls_R_factor_all          0.0446
_refine_ls_R_factor_gt           0.0407
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0705P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1067
_refine_ls_wR_factor_ref         0.1105
_reflns_number_gt                597
_reflns_number_total             658
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            JSSC-2012-195-155.cif
_cod_data_source_block           r12
_cod_original_cell_volume        755.2(3)
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               1562918