Single-crystal structure refinement of NaTiSi~2~O~6~ clinopyroxene at low temperatures (298<<i>T</i><100K)
Redhammer, Günther J.; Ohashi, Haruo; Roth, Georg; Acta Crystallographica Section B 59 (2003) 730–746; doi:10.1107/S0108768103022018

data_2104031
_publ_section_title
;
 Single-crystal structure refinement of NaTiSi~2~O~6~ clinopyroxene at
 low temperatures (298<<i>T</i><100K)
;
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              730
_journal_page_last               746
_journal_paper_doi               10.1107/S0108768103022018
_journal_volume                  59
_journal_year                    2003
_chemical_formula_moiety         'O6 Na1 Si2 Ti1'
_chemical_formula_sum            'Na O6 Si2 Ti'
_chemical_formula_weight         223.07
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 106.83(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.702(3)
_cell_length_b                   8.8798(17)
_cell_length_c                   5.3045(15)
_cell_measurement_reflns_used    2950
_cell_measurement_temperature    260.0(10)
_cell_measurement_theta_max      32.28
_cell_measurement_theta_min      2.1
_cell_volume                     437.4(2)
_computing_cell_refinement       'STOE X-AREA'
_computing_data_collection       'STOE X-AREA'
_computing_data_reduction        'STOE X-AREA'
_computing_structure_refinement  'shelxl-97 (sheldrick, 1997b)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997a)'
_diffrn_measured_fraction_theta_full 0.933
_diffrn_measured_fraction_theta_max 0.933
_diffrn_measurement_device       '2-circle goniometer'
_diffrn_measurement_device_type  'STOE IPDS 2'
_diffrn_measurement_method       'rotation method'
_diffrn_radiation_type           mok\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.026
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            2033
_diffrn_reflns_theta_full        32.03
_diffrn_reflns_theta_max         32.03
_diffrn_reflns_theta_min         3.17
_exptl_absorpt_coefficient_mu    2.552
_exptl_absorpt_correction_T_max  0.729
_exptl_absorpt_correction_T_min  0.642
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'via equivalents'
_exptl_crystal_colour            blue
_exptl_crystal_density_diffrn    3.387
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             436
_exptl_crystal_size_max          0.17
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.431
_refine_diff_density_min         -0.428
_refine_ls_extinction_coef       0.0238(14)
_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   1.146
_refine_ls_matrix_type           full
_refine_ls_number_parameters     48
_refine_ls_number_reflns         710
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.146
_refine_ls_R_factor_gt           0.0178
_refine_ls_shift/su_max          0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0226P)^2^+0.1650P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.045
_reflns_number_gt                633
_reflns_number_total             710
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ws5001.cif
_cod_data_source_block           260
_cod_original_cell_volume        437.39(19)
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               2104031
_cod_database_fobs_code          2104031