Ferroelectricity, ionic conductivity and structural paths for large cation migration in Ca10.5−xPbx(VO4)7 single crystals, x = 1.9, 3.5, 4.9
Deyneko, Dina V.; Petrova, Daria A.; Aksenov, Sergey M.; Stefanovich, Sergey Yu.; Baryshnikova, Oksana V.; Fedotov, Stanislav S.; Burns, Peter C.; Kosmyna, Miron B.; Shekhovtsov, Aleksey N.; Lazoryak, Bogdan I.; CrystEngComm 21 (2019) 1309–; doi:10.1039/C8CE01843J

data_7232187
_publ_section_title
;
 Ferroelectricity, ionic conductivity and structural paths for large
 cation migration in Ca10.5&#x2212;xPbx(VO4)7 single crystals, x = 1.9,
 3.5, 4.9
;
_journal_issue                   8
_journal_name_full               CrystEngComm
_journal_page_first              1309
_journal_paper_doi               10.1039/C8CE01843J
_journal_volume                  21
_journal_year                    2019
_chemical_formula_sum            'Ca8.649 O28 Pb1.851 V7'
_chemical_formula_weight         1534.7
_space_group_IT_number           161
_space_group_name_Hall           'R 3 -2"c'
_space_group_name_H-M_alt        'R 3 c :H'
_symmetry_cell_setting           trigonal
_symmetry_Int_Tables_number      161
_symmetry_space_group_name_Hall  'R 3 -2"c'
_symmetry_space_group_name_H-M   'R 3 c :H'
_audit_update_record
;
2018-08-11 deposited with the CCDC.
2018-11-19 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            6
_cell_length_a                   10.9220(2)
_cell_length_b                   10.9220(2)
_cell_length_c                   38.3133(9)
_cell_measurement_reflns_used    69638
_cell_measurement_temperature    293
_cell_measurement_theta_max      56.22
_cell_measurement_theta_min      4.06
_cell_volume                     3958.08(14)
_diffrn_ambient_temperature      293
_diffrn_detector                 CCD
_diffrn_measured_fraction_theta_full 0.99
_diffrn_measured_fraction_theta_max 0.99
_diffrn_measurement_device       'Xcalibur Oxford Diffraction'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_source         'X-ray tube'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.1083
_diffrn_reflns_av_unetI/netI     0.0613
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       88
_diffrn_reflns_limit_l_min       -78
_diffrn_reflns_number            69638
_diffrn_reflns_theta_full        56.22
_diffrn_reflns_theta_max         56.22
_diffrn_reflns_theta_min         4.06
_exptl_absorpt_coefficient_mu    15.92
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    3.8632
_exptl_crystal_description       'anhedral grain'
_exptl_crystal_F_000             4259
_refine_diff_density_max         1.91
_refine_diff_density_min         -2.34
_refine_ls_abs_structure_details '  0 of Friedel pairs used in the refinement'
_refine_ls_extinction_coef       200(50)
_refine_ls_extinction_method
'B-C type 1 Gaussian isotropic (Becker & Coppens, 1974)'
_refine_ls_goodness_of_fit_gt    1.04
_refine_ls_goodness_of_fit_ref   1.03
_refine_ls_number_constraints    2
_refine_ls_number_parameters     199
_refine_ls_number_reflns         5507
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0794
_refine_ls_R_factor_gt           0.0484
_refine_ls_shift/su_max          0.0449
_refine_ls_shift/su_mean         0.0059
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details     w=1/(\s^2^(F)+0.0001F^2^)
_refine_ls_weighting_scheme      sigma
_refine_ls_wR_factor_gt          0.0368
_refine_ls_wR_factor_ref         0.0455
_reflns_number_gt                3621
_reflns_number_total             5507
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c8ce01843j7.cif
_cod_data_source_block           I_CCDC2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_diffrn_radiation_probe' value 'X-ray' changed to 'x-ray' according
to
/home/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 4973 2017-02-22 13:04:09Z antanas 

 Adding full bibliography for 7232185--7232187.cif.
;
_cod_original_sg_symbol_Hall     'R 3;-2"c'
_cod_original_sg_symbol_H-M      'R 3 c'
_cod_database_code               7232187