Ta3AlC2 and Ta4AlC3- Single-Crystal Investigations of Two New Ternary Carbides of Tantalum Synthesized by the Molten Metal Technique
Johannes Etzkorn; Martin Ade; Harald Hillebrecht; Inorganic Chemistry 46 (2007) 1410–1418; doi:10.1021/ic062231y

data_4307746
_publ_contact_author_address
;
 Albert-Ludwigs-Universit\"at Freiburg
 Institut f\"ur Anorganische und Analytische Chemie
 Albertstr. 21
 D-79104 Freiburg
 Germany
;
_publ_contact_author_email       harald.hillebrecht@ac.uni-freiburg.de
_publ_contact_author_fax         +49-(0)761-203-6012
_publ_contact_author_name        'Prof. Dr. Harald Hillebrecht'
_publ_contact_author_phone       +49-(0)761-203-6131
_publ_section_title
;
Ta3AlC2 and Ta4AlC3- Single-Crystal Investigations of Two New Ternary
Carbides of Tantalum Synthesized by the Molten Metal Technique
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              1410
_journal_page_last               1418
_journal_paper_doi               10.1021/ic062231y
_journal_volume                  46
_journal_year                    2007
_chemical_formula_sum            'C3 Al Ta4'
_chemical_formula_weight         786.81
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           194
_symmetry_cell_setting           hexagonal
_symmetry_space_group_name_Hall  '-P 6c 2c'
_symmetry_space_group_name_H-M   'P 63/m m c'
_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            2
_cell_length_a                   3.1123(5)
_cell_length_b                   3.1123(5)
_cell_length_c                   24.111(5)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      28
_cell_measurement_theta_min      12
_cell_volume                     202.26(6)
_computing_data_collection       'Software Siemens'
_computing_molecular_graphics    'Diamond Crystal Impact'
_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 0.886
_diffrn_measured_fraction_theta_max 0.886
_diffrn_measurement_device_type  'Siemens P4'
_diffrn_measurement_method       omega/2theta-scan
_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  0.1255
_diffrn_reflns_av_sigmaI/netI    0.0587
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       4
_diffrn_reflns_limit_k_min       -4
_diffrn_reflns_limit_l_max       38
_diffrn_reflns_limit_l_min       -38
_diffrn_reflns_number            1130
_diffrn_reflns_theta_full        34.88
_diffrn_reflns_theta_max         34.88
_diffrn_reflns_theta_min         7.58
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  '120 min'
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    107.846
_exptl_absorpt_correction_T_max  0.0357
_exptl_absorpt_correction_T_min  0.0095
_exptl_absorpt_correction_type   'empirical, psi-scans'
_exptl_crystal_colour            'metallic lustrous'
_exptl_crystal_density_diffrn    12.919
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'hexagonal platelet'
_exptl_crystal_F_000             646
_exptl_crystal_size_max          0.04
_exptl_crystal_size_min          0.005
_refine_diff_density_max         3.945
_refine_diff_density_min         -3.849
_refine_diff_density_rms         0.789
_refine_ls_extinction_coef       0.0023(5)
_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   1.050
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     15
_refine_ls_number_reflns         209
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.050
_refine_ls_R_factor_all          0.0491
_refine_ls_R_factor_gt           0.0341
_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^)+(0.0218P)^2^+2.3500P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0535
_refine_ls_wR_factor_ref         0.0578
_reflns_number_gt                166
_reflns_number_total             209
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic062231yrom20061123_104722.cif
_cod_data_source_block           ta4alc3
_cod_database_code               4307746