Ca1-xRExAg1-ySb (RE = La, Ce, Pr, Nd, Sm; 0 <=x<=1; 0 <=y<=1): Interesting Structural Transformation and Enhanced High-Temperature Thermoelectric Performance
Jian Wang; Xiao-Cun Liu; Sheng-Qing Xia; Xu-Tang Tao; Journal of the American Chemical Society 135 (2013) 11840–11848; doi:10.1021/ja403653m

data_4120250
_publ_section_title
;
 Ca1-xRExAg1-ySb (RE = La, Ce, Pr, Nd, Sm; 0 <=x<=1; 0 <=y<=1):
 Interesting Structural Transformation and Enhanced High-Temperature
 Thermoelectric Performance
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              11840
_journal_page_last               11848
_journal_paper_doi               10.1021/ja403653m
_journal_volume                  135
_journal_year                    2013
_chemical_formula_sum            'Ag0.9 Ca0.84 Ce0.16 Sb'
_chemical_formula_weight         274.92
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           186
_symmetry_cell_setting           hexagonal
_symmetry_space_group_name_Hall  'P 6c -2c'
_symmetry_space_group_name_H-M   'P 63 m c'
_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            2
_cell_length_a                   4.7023(6)
_cell_length_b                   4.7023(6)
_cell_length_c                   7.7951(11)
_cell_measurement_reflns_used    169
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      28.27
_cell_measurement_theta_min      5.01
_cell_volume                     149.27(3)
_computing_cell_refinement       'APEX2 Software Suite (Bruker,2005)'
_computing_data_collection       'APEX2 Software Suite (Bruker,2005)'
_computing_data_reduction        'APEX2 Software Suite (Bruker,2005)'
_computing_molecular_graphics    'SHELXTL (Bruker, 1997)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.926
_diffrn_measured_fraction_theta_max 0.926
_diffrn_measurement_device_type
'Bruker APEX2 CCD area-detector diffractometer'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0256
_diffrn_reflns_av_sigmaI/netI    0.0139
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            1624
_diffrn_reflns_theta_full        28.27
_diffrn_reflns_theta_max         28.27
_diffrn_reflns_theta_min         5.01
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    18.441
_exptl_absorpt_correction_T_max  0.8371
_exptl_absorpt_correction_T_min  0.6077
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'APEX2 Software Suite (Bruker,2005)'
_exptl_crystal_colour            Black
_exptl_crystal_density_diffrn    6.117
_exptl_crystal_description       Block
_exptl_crystal_F_000             239
_exptl_crystal_size_max          0.03
_exptl_crystal_size_mid          0.02
_exptl_crystal_size_min          0.01
_refine_diff_density_max         1.186
_refine_diff_density_min         -2.049
_refine_diff_density_rms         0.199
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.44(18)
_refine_ls_extinction_coef       0.018(3)
_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   1.178
_refine_ls_matrix_type           full
_refine_ls_number_parameters     14
_refine_ls_number_reflns         169
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.175
_refine_ls_R_factor_all          0.0207
_refine_ls_R_factor_gt           0.0194
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0281P)^2^+0.4901P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0492
_refine_ls_wR_factor_ref         0.0499
_reflns_number_gt                155
_reflns_number_total             169
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja403653m_si_002_3.cif
_cod_data_source_block           CaCeAgSb
_cod_original_formula_sum        'Ag0.90 Ca0.84 Ce0.16 Sb'
_cod_database_code               4120250