Crystal structure study of new lanthanide silicates with silico-carnotite structure
Piccinelli, F.; Lausi, A.; Speghini, A.; Bettinelli, M.; Journal of Solid State Chemistry 194 (2012) 233–237; doi:10.1016/j.jssc.2012.05.012

data_1562935
_publ_section_title
;
 Crystal structure study of new lanthanide silicates with silico-carnotite
 structure
;
_journal_name_full               'Journal of Solid State Chemistry'
_journal_page_first              233
_journal_page_last               237
_journal_paper_doi               10.1016/j.jssc.2012.05.012
_journal_volume                  194
_journal_year                    2012
_chemical_formula_moiety         Ca3Gd2Si3O12
_chemical_formula_sum            'Ca3 Gd2 O12 Si3'
_chemical_formula_weight         710.99
_space_group_IT_number           62
_space_group_name_Hall           '-P 2ac 2n'
_space_group_name_H-M_alt        'P n m a'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2n'
_symmetry_space_group_name_H-M   'P n m a'
_cell_angle_alpha                90.0
_cell_angle_beta                 90.0
_cell_angle_gamma                90.0
_cell_formula_units_Z            4
_cell_length_a                   6.57911(4)
_cell_length_b                   15.72045(10)
_cell_length_c                   10.07985(7)
_cell_volume                     1042.524(12)
_computing_structure_refinement  GSAS
_diffrn_ambient_temperature      298
_diffrn_radiation_polarisn_ratio 0.932
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.826132
_diffrn_source                   synchrotron
_exptl_absorpt_correction_T_max  0.10571
_exptl_absorpt_correction_T_min  0.07662
_exptl_absorpt_process_details
;   GSAS Absorption/surface roughness correction: function number 0
 Debye-Scherrer absorption correction
Term (= MU.r/wave) =      1.9850    
Correction is not refined.
;
_pd_calc_method                  'Rietveld Refinement'
_pd_instr_location               ' ?'
_pd_meas_2theta_range_inc        0.005
_pd_meas_2theta_range_max        59.995
_pd_meas_2theta_range_min        5.0
_pd_meas_number_of_points        11000
_pd_prep_pressure                101
_pd_prep_temperature             1673
_pd_proc_2theta_range_inc        0.005
_pd_proc_2theta_range_max        59.97873
_pd_proc_2theta_range_min        4.98373
_pd_proc_info_datetime           2012-01-17T16:23:50
_pd_proc_info_excluded_regions   ' ?'
_pd_proc_ls_background_function
;   GSAS Background function number 1 with 28 terms.
 Shifted Chebyshev function of 1st kind
       1:    60.4590     2:   -27.5000     3:   -7.27155     4:    15.5735    
      5:   -21.8495     6:    25.4677     7:   -17.1581     8:    3.91438    
      9:    3.10407    10:   -4.17147    11:    3.75927    12:  -0.427217    
     13:   -5.12551    14:    5.12862    15:   -2.71095    16:   0.925536    
     17:    1.43468    18:   -3.93926    19:    4.15006    20:   -3.01512    
     21:    2.18325    22:  -0.353312    23:   -1.45283    24:   0.630220    
     25:   0.124993    26:  -0.723944    27:   0.651274    28:  -0.304399   
;
_pd_proc_ls_peak_cutoff          0.0010
_pd_proc_ls_profile_function
;
 CW Profile function number 2 with  18 terms
 Profile coefficients for Simpson's rule integration of pseudovoigt function
 C.J. Howard (1982). J. Appl. Cryst.,15,615-620.
 P. Thompson, D.E. Cox & J.B. Hastings (1987). J. Appl. Cryst.,20,79-83.
 #4(LX)   =    0.000 #5(LY)   =    7.436 #6(trns) =    0.000
 #7(asym) =   0.2129 #8(shft) =   0.0000 #9(GP)   =    0.000
 #10(stec)=     0.00 #11(ptec)=     0.00 #12(sfec)=     0.00
 #13(L11) =    0.000 #14(L22) =    0.000 #15(L33) =    0.000
 #16(L12) =    0.000 #17(L13) =    0.000 #18(L23) =    0.000
 Peak tails are ignored  where the intensity is below 0.001 times the peak
   Aniso. broadening axis   0.0   0.0   1.0
;
_pd_proc_ls_prof_R_factor        0.0775
_pd_proc_ls_prof_wR_expected     0.1038
_pd_proc_ls_prof_wR_factor       0.1059
_pd_proc_number_of_points        11000
_pd_spec_mount_mode              transmission
_pd_spec_shape                   cylinder
_refine_ls_goodness_of_fit_all   1.02
_refine_ls_matrix_type           full
_refine_ls_number_parameters     85
_refine_ls_number_restraints     0
_refine_ls_R_Fsqd_factor         0.07403
_refine_ls_shift/su_max          0.01
_refine_ls_shift/su_mean         0.00
_reflns_d_resolution_high        0.827
_reflns_d_resolution_low         8.485
_reflns_limit_h_max              8
_reflns_limit_h_min              0
_reflns_limit_k_max              19
_reflns_limit_k_min              0
_reflns_limit_l_max              12
_reflns_limit_l_min              0
_reflns_number_total             996
_cod_data_source_file            JSSC-2012-194-233.cif
_cod_data_source_block           4
_cod_original_cell_volume        1042.525(8)
_cod_original_sg_symbol_Hall     -P2ac2n
_cod_original_formula_sum        'Ca3.00 Gd2.00 O12.00 Si3.00'
_cod_database_code               1562935
_gsas_exptl_extinct_corr_t_min   1.00000
_gsas_exptl_extinct_corr_t_max   1.00000