Two-Dimensional-Layered Perovskite ALaTa<sub>2</sub>O<sub>7</sub>:Bi<sup>3+</sup> (A = K and Na) Phosphors with Versatile Structures and Tunable Photoluminescence.
Zhou, Guojun; Jiang, Xingxing; Zhao, Jing; Molokeev, Maxim; Lin, Zheshuai; Liu, Quanlin; Xia, Zhiguo; ACS applied materials & interfaces 10 (2018) 24648–24655; doi:10.1021/acsami.8b08129

data_4515271
_publ_section_title
;
 Two-Dimensional-Layered Perovskite
 ALaTa<sub>2</sub>O<sub>7</sub>:Bi<sup>3+</sup> (A = K and Na) Phosphors
 with Versatile Structures and Tunable Photoluminescence.
;
_journal_issue                   29
_journal_name_full               'ACS applied materials &amp; interfaces'
_journal_page_first              24648
_journal_page_last               24655
_journal_paper_doi               10.1021/acsami.8b08129
_journal_volume                  10
_journal_year                    2018
_chemical_formula_moiety
;
Bi0.04 La1.96 O14 Ta4, 2.768(O), 4(Na0.50)
;
_chemical_formula_sum            'Bi0.04 La1.96 Na2 O16.77 Ta4'
_chemical_formula_weight         1318.69
_chemical_name_mineral
;
;
_space_group_IT_number           139
_space_group_name_Hall           '-I 4 2'
_space_group_name_H-M_alt        'I 4/m m m'
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-I 4 2'
_symmetry_space_group_name_H-M   'I 4/m m m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            1
_cell_length_a                   3.895841(86)
_cell_length_b                   3.895841(86)
_cell_length_c                   25.81201(78)
_cell_measurement_reflns_used    104
_cell_measurement_temperature    300
_cell_measurement_theta_max      59.9967253
_cell_measurement_theta_min      2.50578257
_cell_volume                     391.764(17)
_diffrn_ambient_temperature      300
_diffrn_measurement_device_type
;
D8 ADVANCE Bruker
;
_diffrn_radiation_monochromator  none
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type
;
 Cu K\a~1~~2~
;
_exptl_absorpt_coefficient_mu    92.438
_exptl_crystal_density_diffrn    5.589166
_pd_char_colour
;
colourless
;
_pd_meas_2theta_range_inc        0.013
_pd_meas_2theta_range_max        119.993451
_pd_meas_2theta_range_min        5.01156514
_pd_meas_scan_method             step
_pd_proc_ls_pref_orient_corr
;
Anisotropic model of PO. Spherical harmonics 2 ordrer.
 Jarvinen (1993). Application of symmetrized harmonics expansion to correction
of the preferred orientation effect. - J. Appl. Cryst. 26 p525-531.
;
_pd_proc_ls_profile_function     PearsonVII
_pd_proc_ls_prof_R_factor        8.544
_pd_proc_ls_prof_wR_expected     5.429
_pd_proc_ls_prof_wR_factor       11.294
_pd_proc_number_of_points        8844.76042
_pd_spec_mount_mode              reflection
_refine_ls_goodness_of_fit_all   2.080
_refine_ls_R_I_factor            3.05
_refine_ls_shift/su_max          0.01000
_cod_data_source_file            am8b08129_si_003.cif
_cod_data_source_block           a
_cod_original_cell_volume        391.764(21)
_cod_original_sg_symbol_Hall
;
-I 4 2
;
_cod_original_sg_symbol_H-M      I4/mmm
_cod_original_formula_sum
;
Bi0.04 La1.96 Na2 O16.77 Ta4
;
_cod_database_code               4515271