Borates‒Crystal Structures of Prospective Nonlinear Optical Materials: High Anisotropy of the Thermal Expansion Caused by Anharmonic Atomic Vibrations
Bubnova, Rimma; Volkov, Sergey; Barbara Albert; Filatov, Stanislav; Crystals 7 (2017) 93–; doi:10.3390/cryst7030093

data_3000109
_publ_section_title
;
 Borates--Crystal Structures of Prospective Nonlinear Optical Materials:
 High Anisotropy of the Thermal Expansion Caused by Anharmonic Atomic
 Vibrations
;
_journal_issue                   3
_journal_name_full               Crystals
_journal_page_first              93
_journal_paper_doi               10.3390/cryst7030093
_journal_volume                  7
_journal_year                    2017
_chemical_formula_sum            'Al2 B2 K2 O7'
_chemical_formula_weight         265.8
_space_group_IT_number           150
_symmetry_cell_setting           trigonal
_symmetry_Int_Tables_number      150
_symmetry_space_group_name_Hall  'P 3 2"'
_symmetry_space_group_name_H-M   'P 3 2 1'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            3
_cell_length_a                   8.5592(12)
_cell_length_b                   8.5592(12)
_cell_length_c                   8.4485(13)
_cell_measurement_temperature    123
_cell_volume                     536.01(13)
_diffrn_ambient_temperature      123
_diffrn_measured_fraction_theta_full 0.99
_diffrn_measured_fraction_theta_max 0.99
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'IPDS Stoe'
_diffrn_measurement_method       '??integration method??'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_source         'X-ray tube'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0475
_diffrn_reflns_av_unetI/netI     0.0199
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            5022
_diffrn_reflns_theta_full        29.11
_diffrn_reflns_theta_max         29.11
_diffrn_reflns_theta_min         2.41
_exptl_absorpt_coefficient_mu    1.566
_exptl_crystal_density_diffrn    2.47
_exptl_crystal_F_000             390
_refine_diff_density_max         0.23
_refine_diff_density_min         -0.20
_refine_ls_abs_structure_details
'  388 of Friedel pairs used in the refinement'
_refine_ls_extinction_coef       1000(300)
_refine_ls_extinction_method
'B-C type 1 Gaussian isotropic (Becker & Coppens, 1974)'
_refine_ls_goodness_of_fit_gt    1.37
_refine_ls_goodness_of_fit_ref   1.34
_refine_ls_number_constraints    0
_refine_ls_number_parameters     63
_refine_ls_number_reflns         962
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0282
_refine_ls_R_factor_gt           0.0228
_refine_ls_shift/su_max          0.0039
_refine_ls_shift/su_mean         0.0007
_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          0.0234
_refine_ls_wR_factor_ref         0.0241
_reflns_number_gt                872
_reflns_number_total             962
_reflns_threshold_expression     I>3\s(I)
_cod_data_source_file            K2Al2B2O7_123K.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:

'_diffrn_radiation_probe' value 'X-ray' changed to 'x-ray' according
to the built-in table from CIF Core dictionary named 'cif_core.dic'
version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 4624 2016-04-14 12:54:50Z antanas 

 Released structure into public domain as published material.

 Antanas Vaitkus,
 2021-05-18
;
_cod_original_sg_symbol_Hall     'P 3;2"'
_cod_database_code               3000109