On the Crystal Chemistry of RE2Si2O7: Revisited Structures, Group–Subgroup Relationship, and Insights of Ce3±Activated Radioluminescence
Chen, Pengyun; Zhou, Yuqiao; He, Jin; Jiang, Wei; Li, Junhao; Ni, Haiyong; Zhang, Qiuhong; Lin, Litian; Chemistry of Materials 35 (2023) 2635–2646; doi:10.1021/acs.chemmater.3c00245

data_4004097
_publ_section_title
;
 On the Crystal Chemistry of RE2Si2O7: Revisited Structures,
 Group--Subgroup Relationship, and Insights of Ce3+-Activated
 Radioluminescence
;
_journal_issue                   6
_journal_name_full               'Chemistry of Materials'
_journal_page_first              2635
_journal_page_last               2646
_journal_paper_doi               10.1021/acs.chemmater.3c00245
_journal_volume                  35
_journal_year                    2023
_chemical_formula_sum            'O7 Si2 Sm2'
_chemical_formula_weight         468.88
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_atom_sites_solution_hydrogens   .
_audit_creation_method           SHELXL-2018/3
_cell_angle_alpha                90.173(4)
_cell_angle_beta                 90.746(4)
_cell_angle_gamma                91.451(4)
_cell_formula_units_Z            4
_cell_length_a                   5.3810(9)
_cell_length_b                   8.5370(14)
_cell_length_c                   12.855(2)
_cell_measurement_reflns_used    3166
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      32.095
_cell_measurement_theta_min      2.8550
_cell_volume                     590.29(17)
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'Bruker D8 Quest'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0999
_diffrn_reflns_av_unetI/netI     0.1003
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.988
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            18572
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.988
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         33.184
_diffrn_reflns_theta_min         2.386
_exptl_absorpt_coefficient_mu    20.090
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   multi-scan
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    5.276
_exptl_crystal_description       prism
_exptl_crystal_F_000             832
_exptl_crystal_size_max          0.13
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.05
_exptl_transmission_factor_max   0.1008
_exptl_transmission_factor_min   0.0640
_refine_diff_density_max         4.627
_refine_diff_density_min         -3.771
_refine_diff_density_rms         0.613
_refine_ls_extinction_coef       0.0019(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2018/3 (Sheldrick 2018)'
_refine_ls_goodness_of_fit_ref   1.031
_refine_ls_hydrogen_treatment    undef
_refine_ls_matrix_type           full
_refine_ls_number_parameters     201
_refine_ls_number_reflns         4466
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.031
_refine_ls_R_factor_all          0.1234
_refine_ls_R_factor_gt           0.0718
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0562P)^2^+39.6127P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1512
_refine_ls_wR_factor_ref         0.1846
_reflns_Friedel_coverage         0.000
_reflns_Friedel_fraction_full    .
_reflns_Friedel_fraction_max     .
_reflns_number_gt                2887
_reflns_number_total             4466
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            F-Sm2Si2O7-P-1.cif
_cod_data_source_block           F-Sm2Si2O7
_cod_original_cell_volume        590.28(17)
_cod_database_code               4004097
_shelx_shelxl_version_number     2018/3
_shelx_res_checksum              67128
_shelx_hkl_checksum              84117