Two new phosphate langbeinites, Rb~2~YbTi(PO~4~)~3~ and Rb~2~Yb~0.32~Ti~1.68~(PO~4~)~3~, investigated at 293 and 150K
Joacim C. M. Gustafsson; Stefan T. Norberg; Göran Svensson; Jörgen Albertsson; Acta Crystallographica Section C 61 (2005) i9–i13; doi:10.1107/S0108270104030525

data_2014609
_publ_section_title
;
 Two new phosphate langbeinites, Rb~2~YbTi(PO~4~)~3~ and
 Rb~2~Yb~0.32~Ti~1.68~(PO~4~)~3~, investigated at 293 and 150K
;
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              i9
_journal_page_last               i13
_journal_paper_doi               10.1107/S0108270104030525
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'Rb2 Yb Ti (P O4)3'
_chemical_formula_moiety         'O12 P3 Rb2 Ti1 Yb1'
_chemical_formula_structural
;
  'Rb2 (Ti0.675 Yb0.325)(Ti0.325 Yb0.675) (P O4)3'
;
_chemical_formula_sum            'O12 P3 Rb2 Ti Yb'
_chemical_formula_weight         676.79
_chemical_name_common            Langbeinite
_space_group_IT_number           198
_symmetry_cell_setting           cubic
_symmetry_space_group_name_Hall  'P 2ac 2ab 3'
_symmetry_space_group_name_H-M   'P 21 3'
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.2111(2)
_cell_length_b                   10.2111(2)
_cell_length_c                   10.2111(2)
_cell_measurement_reflns_used    7527
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      32.93
_cell_measurement_theta_min      2.82
_cell_volume                     1064.68(4)
_computing_cell_refinement
'SAINT (Siemens, 1995) or SAINT-Plus? (Bruker, 1999)'
_computing_data_collection       'SMART (Siemens, 1995)'
_computing_data_reduction
;
SAINT-Plus (Bruker, 1999) and SADABS (Sheldrick, 2001)
;
_computing_molecular_graphics
;
'Ortep-3 for Windows (Farrugia, 1997) and DIAMOND (Brandenburg, 2000)'
;
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'Coordinates from RA'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'Siemens SMART CCD diffractometer'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0439
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            19497
_diffrn_reflns_theta_full        33.08
_diffrn_reflns_theta_max         33.08
_diffrn_reflns_theta_min         2.82
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    19.078
_exptl_absorpt_correction_T_max  0.385
_exptl_absorpt_correction_T_min  0.25
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick   2001)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    4.222
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1228
_exptl_crystal_size_max          0.08
_exptl_crystal_size_mid          0.07
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.714
_refine_diff_density_min         -1.217
_refine_ls_abs_structure_details 'Flack (1983)'
_refine_ls_abs_structure_Flack   0.017(15)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.277
_refine_ls_matrix_type           full
_refine_ls_number_constraints    8
_refine_ls_number_parameters     60
_refine_ls_number_reflns         1342
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.276
_refine_ls_R_factor_all          0.0234
_refine_ls_R_factor_gt           0.023
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.01P)^2^+7.1387P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0538
_refine_ls_wR_factor_gt          0.0536
_refine_ls_wR_factor_ref         0.0538
_reflns_number_gt                1333
_reflns_number_total             1342
_reflns_threshold_expression     'F^2^ > 2\s(F^2^)'
_cod_data_source_file            bc1051.cif
_cod_data_source_block           I_150_K
_cod_original_sg_symbol_Hall     P_2ac_2ab_3
_cod_original_formula_sum        'O12 P3 Rb2 Ti1 Yb1'
_cod_database_code               2014609
_cod_database_fobs_code          2014609