Structural study of Ca2Gd2Ge2O9 and optical spectroscopy of the Eu3+ dopant ion
Piccinelli, Fabio; Pedroni, Marco; Cagliero, Stefano; Speghini, Adolfo; Bettinelli, Marco; Journal of Solid State Chemistry 212 (2014) 180–184; doi:10.1016/j.jssc.2014.01.025

data_1562453
_publ_section_title
;
 Structural study of Ca2Gd2Ge2O9 and optical spectroscopy of the Eu3+
 dopant ion
;
_journal_name_full               'Journal of Solid State Chemistry'
_journal_page_first              180
_journal_page_last               184
_journal_paper_doi               10.1016/j.jssc.2014.01.025
_journal_volume                  212
_journal_year                    2014
_chemical_formula_moiety         Ca2Gd2Ge2O9
_chemical_formula_sum            'Ca2 Gd2 Ge2 O9'
_chemical_formula_weight         683.93
_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            2
_cell_length_a                   10.66898(9)
_cell_length_b                   3.79866(3)
_cell_length_c                   10.69317(8)
_cell_measurement_temperature    293
_cell_volume                     433.371(6)
_computing_structure_refinement  GSAS
_diffrn_ambient_temperature      298
_diffrn_radiation_polarisn_ratio 0.954
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.619866
_diffrn_source                   synchrotron
_exptl_absorpt_correction_T_max  0.07594
_exptl_absorpt_correction_T_min  0.04710
_exptl_absorpt_process_details
;   GSAS Absorption/surface roughness correction: function number 0
 Debye-Scherrer absorption correction
Term (= MU.r/wave) =      3.2260    
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        3.0
_pd_meas_number_of_points        11400
_pd_phase_name
'from C:/Users/Fabio/Documents/Polveri/Stefano Cagliero/Ca2Y2Si2O9('
_pd_prep_pressure                101
_pd_prep_temperature             1673
_pd_proc_2theta_range_inc        0.005
_pd_proc_2theta_range_max        60.00385
_pd_proc_2theta_range_min        3.00885
_pd_proc_info_datetime           2013-10-08T12:50:07
_pd_proc_info_excluded_regions   ' ?'
_pd_proc_ls_background_function
;   GSAS Background function number 1 with 24 terms.
 Shifted Chebyshev function of 1st kind
       1:    105.964     2:   -67.8527     3:    10.9697     4:    3.32576    
      5:   -6.25582     6:    10.2990     7:   -8.99722     8:    7.97664    
      9:    1.47207    10:   -4.71819    11:    7.05693    12:   -3.95100    
     13:   0.482015    14:    4.50006    15:   -5.71559    16:    6.08140    
     17:   -2.01150    18:  -0.207551    19:    2.57129    20:   -1.66571    
     21:    1.78354    22:   -1.05763    23:   0.811864    24:   0.267876    
;
_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.
 #1(GU)   =   22.908 #2(GV)   =   -3.446 #3(GW)   =    1.564
 #4(LX)   =    0.041 #5(LY)   =    8.754 #6(trns) =    0.000
 #7(asym) =  -0.1295 #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 0.0010 times the peak
   Aniso. broadening axis   0.0   0.0   1.0
;
_pd_proc_ls_prof_R_factor        0.0792
_pd_proc_ls_prof_wR_expected     0.0755
_pd_proc_ls_prof_wR_factor       0.1060
_pd_proc_number_of_points        11400
_pd_spec_mount_mode              transmission
_pd_spec_shape                   cylinder
_refine_ls_goodness_of_fit_all   1.24
_refine_ls_matrix_type           full
_refine_ls_number_parameters     62
_refine_ls_number_restraints     0
_refine_ls_R_Fsqd_factor         0.0745
_refine_ls_shift/su_max          0.03
_refine_ls_shift/su_mean         0.00
_reflns_d_resolution_high        0.620
_reflns_d_resolution_low         7.548
_reflns_limit_h_max              17
_reflns_limit_h_min              0
_reflns_limit_k_max              6
_reflns_limit_k_min              0
_reflns_limit_l_max              17
_reflns_limit_l_min              0
_reflns_number_total             1063
_cod_data_source_file            JSSC-2014-212-180.cif
_cod_data_source_block           CA2GD2GE2O9
_cod_original_cell_volume        433.371(4)
_cod_original_sg_symbol_Hall     -P2ac2n
_cod_original_formula_sum        'Ca2.00 Gd2.00 Ge2.00 O9.00'
_cod_database_code               1562453