Temperature dependence of the <i>A</i>V~3~O~7~ (<i>A</i> = Ca, Sr) structure
Prinz, Sebastian; Sparta, Karine M.; Roth, Georg; Acta Crystallographica Section B 63 (2007) 836–842; doi:10.1107/S0108768107050550

data_2103001
_publ_section_title
;
 Temperature dependence of the <i>A</i>V~3~O~7~ (<i>A</i> = Ca, Sr)
 structure
;
_journal_coeditor_code           BM5051
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              836
_journal_page_last               842
_journal_paper_doi               10.1107/S0108768107050550
_journal_volume                  63
_journal_year                    2007
_chemical_formula_moiety         'O7 V3, Ca'
_chemical_formula_sum            'Ca O7 V3'
_chemical_formula_weight         304.90
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           62
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2n'
_symmetry_space_group_name_H-M   'P n m a'
_atom_sites_solution_hydrogens   none
_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                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.437(3)
_cell_length_b                   10.367(2)
_cell_length_c                   5.2947(15)
_cell_measurement_reflns_used    2678
_cell_measurement_temperature    275.0(10)
_cell_measurement_theta_max      23.4
_cell_measurement_theta_min      1.3
_cell_volume                     572.9(3)
_computing_cell_refinement       'X-AREA (Stoe, 2002)'
_computing_data_collection       'X-AREA (Stoe, 2002)'
_computing_data_reduction        'X-RED (Stoe, 1996)'
_computing_molecular_graphics    'ATOMS Version 5.1'
_computing_publication_material  'WinGX 1.64.05 (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      275.0(10)
_diffrn_detector_area_resol_mean 0
_diffrn_measured_fraction_theta_full 0.955
_diffrn_measured_fraction_theta_max 0.955
_diffrn_measurement_device_type  'STOE IPDS 2'
_diffrn_measurement_method       'Rotation method'
_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  0.0378
_diffrn_reflns_av_sigmaI/netI    0.0219
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       5
_diffrn_reflns_limit_l_min       -5
_diffrn_reflns_number            2416
_diffrn_reflns_theta_full        22.96
_diffrn_reflns_theta_max         22.96
_diffrn_reflns_theta_min         3.90
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    5.667
_exptl_absorpt_correction_T_max  0.4715
_exptl_absorpt_correction_T_min  0.3174
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'X-SHAPE (Stoe & Cie, 1996)'
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    3.535
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             580
_exptl_crystal_size_max          0.3
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.342
_refine_diff_density_min         -0.386
_refine_ls_extinction_coef       0.0187(18)
_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   0.976
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     38
_refine_ls_number_reflns         402
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.976
_refine_ls_R_factor_all          0.0242
_refine_ls_R_factor_gt           0.0205
_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^)+(0.0494P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0593
_refine_ls_wR_factor_ref         0.0605
_reflns_number_gt                367
_reflns_number_total             402
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            bm5051.cif
_cod_data_source_block           CaV3O7_275k
_cod_database_code               2103001