data_2104952
_publ_section_title
;
 High-pressure experimental study on Rb₂S: antifluorite to
 Ni₂In-type phase transitions
;
_journal_coeditor_code           WH5012
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              109
_journal_page_last               115
_journal_paper_doi               10.1107/S010876811005370X
_journal_volume                  67
_journal_year                    2011
_chemical_formula_moiety         'Rb2 S'
_chemical_formula_sum            'Rb2 S'
_chemical_formula_weight         203.004
_chemical_name_common            'Rubidium sulfide'
_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'
_cell_angle_alpha                90.00000
_cell_angle_beta                 90.00000
_cell_angle_gamma                90.00000
_cell_formula_units_Z            4
_cell_length_a                   8.167(10)
_cell_length_b                   5.101(6)
_cell_length_c                   9.957(11)
_cell_measurement_temperature    293
_cell_volume                     414.8(8)
_computing_structure_refinement  FULLPROF
_diffrn_ambient_temperature      293
_diffrn_measurement_device_type  'Xcalibur Oxford Difraction'
_diffrn_radiation_type           MoK\a
_exptl_absorpt_coefficient_mu    23.85
_pd_char_colour                  white
_pd_meas_2theta_range_inc        0.023980
_pd_meas_2theta_range_max        19.00829
_pd_meas_2theta_range_min        5.14781
_pd_meas_number_of_points        580
_pd_meas_scan_method             fixed
_pd_prep_pressure                700000
_pd_prep_temperature             293
_pd_proc_2theta_range_inc        0.023980
_pd_proc_2theta_range_max        18.9273
_pd_proc_2theta_range_min        5.0668
_pd_proc_ls_background_function  '17 background points'
_pd_proc_ls_profile_function     pseudo-Voigt
_pd_proc_ls_prof_R_factor        0.091258
_pd_proc_ls_prof_wR_expected     0.073296
_pd_proc_ls_prof_wR_factor       0.158657
_pd_proc_wavelength              0.71073
_pd_spec_mounting                ' Diamond anvil cell'
_pd_spec_mount_mode              transmission
_pd_spec_shape                   cylinder
_pd_spec_size_axial              0.2
_pd_spec_size_equat              0.05
_refine_ls_goodness_of_fit_all   2.1646
_refine_ls_number_parameters     14
_refine_ls_number_reflns         100
_refine_ls_number_restraints     0
_[local]_cod_data_source_file    wh5012.cif
_[local]_cod_data_source_block   phaseII
_cod_original_cell_volume        414.7(8)
_cod_database_code               2104952
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
x+1/2,-y+1/2,-z+1/2
-x,y+1/2,-z
-x+1/2,-y,z+1/2
-x,-y,-z
-x+1/2,y+1/2,z+1/2
x,-y+1/2,z
x+1/2,y,-z+1/2
loop_
_atom_site_type_symbol
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
_atom_site_adp_type
_atom_site_occupancy
Rb Rb1 0.0390(10) 0.25000 0.1891(4) 0.00000 Uiso 1.00000
Rb Rb2 0.1652(6) 0.25000 0.5778(5) 0.00000 Uiso 1.00000
S S1 0.224(3) 0.25000 0.8892(12) 0.00000 Uiso 1.00000
loop_
_atom_type_symbol
_atom_type_scat_dispersion_real
_atom_type_scat_dispersion_imag
_atom_type_scat_source
rb -1.04400 2.97300
International_Tables_for_Crystallography_Vol.C(1991)_Tables_6.1.1.4_and_6.1.1.5
s 0.11000 0.12400
International_Tables_for_Crystallography_Vol.C(1991)_Tables_6.1.1.4_and_6.1.1.5
loop_
_geom_angle_atom_site_label_1
_geom_angle_atom_site_label_2
_geom_angle_atom_site_label_3
_geom_angle_site_symmetry_1
_geom_angle_site_symmetry_2
_geom_angle_site_symmetry_3
_geom_angle
_geom_angle_publ_flag
? ? ? ? ? ? ? ?
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_site_symmetry_1
_geom_bond_site_symmetry_2
_geom_bond_distance
_geom_bond_publ_flag
? ? ? ? ? ?
loop_
_geom_contact_atom_site_label_1
_geom_contact_atom_site_label_2
_geom_contact_distance
_geom_contact_site_symmetry_1
_geom_contact_site_symmetry_2
_geom_contact_publ_flag
? ? ? ? ? ?
loop_
_geom_hbond_atom_site_label_D
_geom_hbond_atom_site_label_H
_geom_hbond_atom_site_label_A
_geom_hbond_site_symmetry_D
_geom_hbond_site_symmetry_H
_geom_hbond_site_symmetry_A
_geom_hbond_distance_DH
_geom_hbond_distance_HA
_geom_hbond_distance_DA
_geom_hbond_angle_DHA
_geom_hbond_publ_flag
? ? ? ? ? ? ? ? ? ? ?
loop_
_geom_torsion_atom_site_label_1
_geom_torsion_atom_site_label_2
_geom_torsion_atom_site_label_3
_geom_torsion_atom_site_label_4
_geom_torsion_site_symmetry_1
_geom_torsion_site_symmetry_2
_geom_torsion_site_symmetry_3
_geom_torsion_site_symmetry_4
_geom_torsion
_geom_torsion_publ_flag
? ? ? ? ? ? ? ? ? ?
