Synthesis and Structure of Alkaline Earth Silicon Nitrides: BaSiN2, SrSiN2, and CaSiN2
Zoltán A. Gál; Phillip M. Mallinson; Heston J. Orchard; Simon J. Clarke; Inorganic Chemistry 43 (2004) 3998–4006; doi:10.1021/ic049901p

data_4311197
_publ_section_title
;
 Synthesis and Structure of Alkaline Earth Silicon Nitrides: BaSiN2,
 SrSiN2, and CaSiN2
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              3998
_journal_page_last               4006
_journal_paper_doi               10.1021/ic049901p
_journal_volume                  43
_journal_year                    2004
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'N16 Si8, 8(Ca)'
_chemical_formula_sum            'Ca8 N16 Si8'
_chemical_formula_weight         769.52
_chemical_name_common            'Calcium Silicon Nitride'
_chemical_name_systematic        'Calcium Silicon DiNitride'
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      61
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.2
_audit_creation_date             2003-12-16T18:32:03-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   5.1229(3)
_cell_length_b                   10.2074(6)
_cell_length_c                   14.8233(9)
_cell_measurement_reflns_used    23647
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      32.032
_cell_measurement_theta_min      5.097
_cell_measurement_wavelength     0.71073
_cell_volume                     775.13(8)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction
'HKL Denzo and Scalepack (Otwinowski & Minor 1997)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector                 'CCD plate'
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       'CCD rotation images, thick slices'
_diffrn_orient_matrix_type       'by Nonius Collect from scalepack cell'
_diffrn_orient_matrix_UB_11      -0.151143
_diffrn_orient_matrix_UB_12      -0.376875E-1
_diffrn_orient_matrix_UB_13      0.338982E-1
_diffrn_orient_matrix_UB_21      -0.649548E-1
_diffrn_orient_matrix_UB_22      -0.419203E-1
_diffrn_orient_matrix_UB_23      -0.566907E-1
_diffrn_orient_matrix_UB_31      0.105074
_diffrn_orient_matrix_UB_32      -0.801255E-1
_diffrn_orient_matrix_UB_33      0.137154E-1
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0449
_diffrn_reflns_av_unetI/netI     0.0504
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            1946
_diffrn_reflns_theta_full        29.57
_diffrn_reflns_theta_max         29.57
_diffrn_reflns_theta_min         5.23
_diffrn_source                   'Enraf Nonius FR590'
_exptl_absorpt_coefficient_mu    3.384
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    3.297
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             768
_exptl_crystal_size_max          0.02
_exptl_crystal_size_mid          0.015
_exptl_crystal_size_min          0.01
_refine_diff_density_max         0.988
_refine_diff_density_min         -0.691
_refine_diff_density_rms         0.169
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.025
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     73
_refine_ls_number_reflns         1071
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.025
_refine_ls_R_factor_all          0.0781
_refine_ls_R_factor_gt           0.0392
_refine_ls_shift/su_max          0
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0452P)^2^+0.1534P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0851
_refine_ls_wR_factor_ref         0.0988
_reflns_number_gt                696
_reflns_number_total             1071
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic049901psi20040126_125250_3.cif
_cod_data_source_block           CaSiN2
_cod_database_code               4311197