Pressure-induced phase transitions of piezoelectric single crystals from the langasite family: La~3~Nb~0.5~Ga~5.5~O~14~ and La~3~Ta~0.5~Ga~5.5~O~14~
Pavlovska, A.; Werner, S.; Maximov, B.; Mill, B.; Acta Crystallographica Section B 58 (2002) 939–947; doi:10.1107/S0108768102010273

data_2103542
_publ_section_title
;
 Pressure-induced phase transitions of piezoelectric single crystals
 from the langasite family: La~3~Nb~0.5~Ga~5.5~O~14~ and
 La~3~Ta~0.5~Ga~5.5~O~14~
;
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              939
_journal_page_last               947
_journal_paper_doi               10.1107/S0108768102010273
_journal_volume                  58
_journal_year                    2002
_chemical_formula_sum            'Ga5.54 La3 O14 Ta0.46'
_chemical_formula_weight         1110.22
_chemical_name_systematic        ?
_space_group_IT_number           150
_symmetry_space_group_name_Hall  'P 3 2"'
_symmetry_space_group_name_H-M   'P 3 2 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                120.00
_cell_formula_units_Z            1
_cell_length_a                   8.063
_cell_length_b                   8.063
_cell_length_c                   5.059
_cell_measurement_temperature    293(2)
_cell_volume                     284.8
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_pressure         8.15E+6
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.611
_diffrn_measured_fraction_theta_max 0.611
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_wavelength     0.70930
_diffrn_reflns_av_R_equivalents  0.0888
_diffrn_reflns_av_sigmaI/netI    0.0544
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       6
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            1557
_diffrn_reflns_theta_full        31.88
_diffrn_reflns_theta_max         31.88
_diffrn_reflns_theta_min         2.91
_exptl_absorpt_coefficient_mu    28.343
_exptl_crystal_density_diffrn    6.472
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             488
_refine_diff_density_max         2.492
_refine_diff_density_min         -2.555
_refine_diff_density_rms         0.654
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.05(8)
_refine_ls_extinction_coef       0.146(17)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.160
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     45
_refine_ls_number_reflns         423
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.160
_refine_ls_R_factor_all          0.0541
_refine_ls_R_factor_gt           0.0528
_refine_ls_shift/su_max          0.121
_refine_ls_shift/su_mean         0.021
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1250
_refine_ls_wR_factor_ref         0.1258
_reflns_number_gt                417
_reflns_number_total             423
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            sn0021-8.15cad4.cif
_cod_data_source_block           8.15cad4
_cod_depositor_comments
;
The _diffrn_ambient_pressure was taken from the original data block
header, after comparison with the paper text and supplementary
material.

Saulius Gra\<zulis
;
_cod_database_code               2103542