data_global
_chemical_name_mineral 'Polkanovite'
loop_
_publ_author_name
'Pivan J Y'
'Guerin R'
'Sergent M'
_journal_name_full 'Journal of the Less-Common Metals'
_journal_volume 107 
_journal_year 1985
_journal_page_first 249
_journal_page_last 258
_publ_section_title
;
 Rh12As7, a host structure for rare earth elements: Crystal structures of Rh12As7
 and Ho2Rh12As7
 Note: x(RhII) corrected
;
_database_code_amcsd 0014151
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Rh6 As3.5'
_cell_length_a 9.297
_cell_length_b 9.297
_cell_length_c 3.657
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 273.742
_exptl_crystal_density_diffrn     10.672
_symmetry_space_group_name_H-M 'P 63/m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x+y,-x,1/2-z'
  'x-y,x,1/2+z'
  'y,-x+y,-z'
  '-y,x-y,z'
  'x,y,1/2-z'
  '-x,-y,1/2+z'
  'x-y,x,-z'
  '-x+y,-x,z'
  '-y,x-y,1/2-z'
  'y,-x+y,1/2+z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
RhI   0.37970   0.86440   0.25000   1.00000   0.00899
RhII   0.23470   0.24360   0.25000   1.00000   0.01343
AsI   0.44660   0.16080   0.25000   1.00000   0.00849
AsII   0.00000   0.00000   0.13300   0.25000   0.02153
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
RhI 0.00493 0.00460 0.01762 0.00296 0.00000 0.00000
RhII 0.01741 0.00591 0.01558 0.00493 0.00000 0.00000
AsI 0.00525 0.00427 0.01694 0.00328 0.00000 0.00000
AsII 0.00427 0.00427 0.05420 0.00131 0.00000 0.00000