data_1001381
_chemical_name_systematic          'Potassium uranium(VI) oxide (1/1/3.5)'
_chemical_formula_structural       'K U O3.5'
_chemical_formula_sum              'K O3.5 U'
_publ_section_title
;
Synthesis and crystal structure of K~2~ U~2~ O~7~ and Moessbauer
(^237^Np) studies of K~2~ Np~2~ O~7~ and Ca Np O~4~
;
loop_
_publ_author_name
  'Jove, J'
  'Cousson, A'
  'Gasperin, M'
_journal_name_full                 'Journal of the Less-Common Metals'
_journal_coden_ASTM                JCOMAH
_journal_volume                    139
_journal_year                      1988
_journal_page_first                345
_journal_page_last                 350
_cell_length_a                     3.96(2)
_cell_length_b                     3.96(2)
_cell_length_c                     19.82(4)
_cell_angle_alpha                  90
_cell_angle_beta                   90
_cell_angle_gamma                  120
_cell_volume                       269.2
_cell_formula_units_Z              3
_exptl_crystal_density_meas        6.14
_symmetry_space_group_name_H-M     'R -3 m H'
_symmetry_Int_Tables_number        166
_symmetry_cell_setting             trigonal
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '-y,x-y,z'
  'y-x,-x,z'
  '-y,-x,z'
  'x,x-y,z'
  'y-x,y,z'
  '-x,-y,-z'
  'y,y-x,-z'
  'x-y,x,-z'
  'y,x,-z'
  '-x,y-x,-z'
  'x-y,-y,-z'
  '1/3+x,2/3+y,2/3+z'
  '2/3+x,1/3+y,1/3+z'
  '1/3-y,2/3+x-y,2/3+z'
  '2/3-y,1/3+x-y,1/3+z'
  '1/3-x+y,2/3-x,2/3+z'
  '2/3-x+y,1/3-x,1/3+z'
  '1/3-y,2/3-x,2/3+z'
  '2/3-y,1/3-x,1/3+z'
  '1/3+x,2/3+x-y,2/3+z'
  '2/3+x,1/3+x-y,1/3+z'
  '1/3-x+y,2/3+y,2/3+z'
  '2/3-x+y,1/3+y,1/3+z'
  '1/3-x,2/3-y,2/3-z'
  '2/3-x,1/3-y,1/3-z'
  '1/3+y,2/3-x+y,2/3-z'
  '2/3+y,1/3-x+y,1/3-z'
  '1/3+x-y,2/3+x,2/3-z'
  '2/3+x-y,1/3+x,1/3-z'
  '1/3+y,2/3+x,2/3-z'
  '2/3+y,1/3+x,1/3-z'
  '1/3-x,2/3-x+y,2/3-z'
  '2/3-x,1/3-x+y,1/3-z'
  '1/3+x-y,2/3-y,2/3-z'
  '2/3+x-y,1/3-y,1/3-z'
loop_
_atom_type_symbol
_atom_type_oxidation_number
  U6+    6.000
  K1+    1.000
  O2-   -2.000
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_symmetry_multiplicity
_atom_site_Wyckoff_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_attached_hydrogens
_atom_site_calc_flag
  U1    U6+   18 f 0.0443(3) 0. 0. 0.167  0 d
  K1    K1+    3 b 0. 0. 0.5 1.  0 d
  O1    O2-    6 c 0. 0. 0.0936(8) 1.  0 d
  O2    O2-   36 i 0.0412(118) -0.0640(171) 0.3429(20) 0.125  0 d
_refine_ls_R_factor_all            0.0445