data_1001776
_chemical_name_systematic          'Uranium ditantalate'
_chemical_name_mineral             'Uranmicrolite'
_chemical_compound_source
;
synthetic by heating U Ta2 O8 at 1973 K for 30 min
;
_chemical_formula_structural       'U (Ta2 O7)'
_chemical_formula_sum              'O7 Ta2 U'
_publ_section_title
;
Contribution a l'etude de quelques oxydes doubles que forme le tantale
avec l'etain, l'uranium et le calcium.
;
_publ_author_name                  'Gasperin, M'
_journal_name_full
;
Bulletin de la Societe Francaise de Mineralogie et de Cristallographie
(72,1949-100,1977)
;
_journal_coden_ASTM                BUFCAE
_journal_volume                    83
_journal_year                      1960
_journal_page_first                1
_journal_page_last                 21
_cell_length_a                     10.37(5)
_cell_length_b                     10.37(5)
_cell_length_c                     10.37(5)
_cell_angle_alpha                  90
_cell_angle_beta                   90
_cell_angle_gamma                  90
_cell_volume                       1115.2
_cell_formula_units_Z              8
_symmetry_space_group_name_H-M     'F d -3 m S'
_symmetry_Int_Tables_number        227
_symmetry_cell_setting             cubic
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  'y,z,x'
  'z,x,y'
  'x,z,y'
  'y,x,z'
  'z,y,x'
  'x,-y,-z'
  'y,-z,-x'
  'z,-x,-y'
  'x,-z,-y'
  'y,-x,-z'
  'z,-y,-x'
  '-x,y,-z'
  '-y,z,-x'
  '-z,x,-y'
  '-x,z,-y'
  '-y,x,-z'
  '-z,y,-x'
  '-x,-y,z'
  '-y,-z,x'
  '-z,-x,y'
  '-x,-z,y'
  '-y,-x,z'
  '-z,-y,x'
  '1/4-x,1/4-y,1/4-z'
  '1/4-y,1/4-z,1/4-x'
  '1/4-z,1/4-x,1/4-y'
  '1/4-x,1/4-z,1/4-y'
  '1/4-y,1/4-x,1/4-z'
  '1/4-z,1/4-y,1/4-x'
  '1/4-x,1/4+y,1/4+z'
  '1/4-y,1/4+z,1/4+x'
  '1/4-z,1/4+x,1/4+y'
  '1/4-x,1/4+z,1/4+y'
  '1/4-y,1/4+x,1/4+z'
  '1/4-z,1/4+y,1/4+x'
  '1/4+x,1/4-y,1/4+z'
  '1/4+y,1/4-z,1/4+x'
  '1/4+z,1/4-x,1/4+y'
  '1/4+x,1/4-z,1/4+y'
  '1/4+y,1/4-x,1/4+z'
  '1/4+z,1/4-y,1/4+x'
  '1/4+x,1/4+y,1/4-z'
  '1/4+y,1/4+z,1/4-x'
  '1/4+z,1/4+x,1/4-y'
  '1/4+x,1/4+z,1/4-y'
  '1/4+y,1/4+x,1/4-z'
  '1/4+z,1/4+y,1/4-x'
  'x,1/2+y,1/2+z'
  '1/2+x,y,1/2+z'
  '1/2+x,1/2+y,z'
  'y,1/2+z,1/2+x'
  '1/2+y,z,1/2+x'
  '1/2+y,1/2+z,x'
  'z,1/2+x,1/2+y'
  '1/2+z,x,1/2+y'
  '1/2+z,1/2+x,y'
  'x,1/2+z,1/2+y'
  '1/2+x,z,1/2+y'
  '1/2+x,1/2+z,y'
  'y,1/2+x,1/2+z'
  '1/2+y,x,1/2+z'
  '1/2+y,1/2+x,z'
  'z,1/2+y,1/2+x'
  '1/2+z,y,1/2+x'
  '1/2+z,1/2+y,x'
  'x,1/2-y,1/2-z'
  '1/2+x,-y,1/2-z'
  '1/2+x,1/2-y,-z'
  'y,1/2-z,1/2-x'
  '1/2+y,-z,1/2-x'
  '1/2+y,1/2-z,-x'
  'z,1/2-x,1/2-y'
  '1/2+z,-x,1/2-y'
  '1/2+z,1/2-x,-y'
  'x,1/2-z,1/2-y'
  '1/2+x,-z,1/2-y'
  '1/2+x,1/2-z,-y'
  'y,1/2-x,1/2-z'
  '1/2+y,-x,1/2-z'
  '1/2+y,1/2-x,-z'
  'z,1/2-y,1/2-x'
  '1/2+z,-y,1/2-x'
  '1/2+z,1/2-y,-x'
  '-x,1/2+y,1/2-z'
  '1/2-x,y,1/2-z'
  '1/2-x,1/2+y,-z'
  '-y,1/2+z,1/2-x'
  '1/2-y,z,1/2-x'
  '1/2-y,1/2+z,-x'
  '-z,1/2+x,1/2-y'
  '1/2-z,x,1/2-y'
  '1/2-z,1/2+x,-y'
  '-x,1/2+z,1/2-y'
  '1/2-x,z,1/2-y'
  '1/2-x,1/2+z,-y'
  '-y,1/2+x,1/2-z'
  '1/2-y,x,1/2-z'
  '1/2-y,1/2+x,-z'
  '-z,1/2+y,1/2-x'
  '1/2-z,y,1/2-x'
  '1/2-z,1/2+y,-x'
  '-x,1/2-y,1/2+z'
  '1/2-x,-y,1/2+z'
  '1/2-x,1/2-y,z'
  '-y,1/2-z,1/2+x'
  '1/2-y,-z,1/2+x'
  '1/2-y,1/2-z,x'
  '-z,1/2-x,1/2+y'
  '1/2-z,-x,1/2+y'
  '1/2-z,1/2-x,y'
  '-x,1/2-z,1/2+y'
  '1/2-x,-z,1/2+y'
  '1/2-x,1/2-z,y'
  '-y,1/2-x,1/2+z'
  '1/2-y,-x,1/2+z'
  '1/2-y,1/2-x,z'
  '-z,1/2-y,1/2+x'
  '1/2-z,-y,1/2+x'
  '1/2-z,1/2-y,x'
  '1/4-x,3/4-y,3/4-z'
  '3/4-x,1/4-y,3/4-z'
  '3/4-x,3/4-y,1/4-z'
  '1/4-y,3/4-z,3/4-x'
  '3/4-y,1/4-z,3/4-x'
  '3/4-y,3/4-z,1/4-x'
  '1/4-z,3/4-x,3/4-y'
  '3/4-z,1/4-x,3/4-y'
  '3/4-z,3/4-x,1/4-y'
  '1/4-x,3/4-z,3/4-y'
  '3/4-x,1/4-z,3/4-y'
  '3/4-x,3/4-z,1/4-y'
  '1/4-y,3/4-x,3/4-z'
  '3/4-y,1/4-x,3/4-z'
  '3/4-y,3/4-x,1/4-z'
  '1/4-z,3/4-y,3/4-x'
  '3/4-z,1/4-y,3/4-x'
  '3/4-z,3/4-y,1/4-x'
  '1/4-x,3/4+y,3/4+z'
  '3/4-x,1/4+y,3/4+z'
  '3/4-x,3/4+y,1/4+z'
  '1/4-y,3/4+z,3/4+x'
  '3/4-y,1/4+z,3/4+x'
  '3/4-y,3/4+z,1/4+x'
  '1/4-z,3/4+x,3/4+y'
  '3/4-z,1/4+x,3/4+y'
  '3/4-z,3/4+x,1/4+y'
  '1/4-x,3/4+z,3/4+y'
  '3/4-x,1/4+z,3/4+y'
  '3/4-x,3/4+z,1/4+y'
  '1/4-y,3/4+x,3/4+z'
  '3/4-y,1/4+x,3/4+z'
  '3/4-y,3/4+x,1/4+z'
  '1/4-z,3/4+y,3/4+x'
  '3/4-z,1/4+y,3/4+x'
  '3/4-z,3/4+y,1/4+x'
  '1/4+x,3/4-y,3/4+z'
  '3/4+x,1/4-y,3/4+z'
  '3/4+x,3/4-y,1/4+z'
  '1/4+y,3/4-z,3/4+x'
  '3/4+y,1/4-z,3/4+x'
  '3/4+y,3/4-z,1/4+x'
  '1/4+z,3/4-x,3/4+y'
  '3/4+z,1/4-x,3/4+y'
  '3/4+z,3/4-x,1/4+y'
  '1/4+x,3/4-z,3/4+y'
  '3/4+x,1/4-z,3/4+y'
  '3/4+x,3/4-z,1/4+y'
  '1/4+y,3/4-x,3/4+z'
  '3/4+y,1/4-x,3/4+z'
  '3/4+y,3/4-x,1/4+z'
  '1/4+z,3/4-y,3/4+x'
  '3/4+z,1/4-y,3/4+x'
  '3/4+z,3/4-y,1/4+x'
  '1/4+x,3/4+y,3/4-z'
  '3/4+x,1/4+y,3/4-z'
  '3/4+x,3/4+y,1/4-z'
  '1/4+y,3/4+z,3/4-x'
  '3/4+y,1/4+z,3/4-x'
  '3/4+y,3/4+z,1/4-x'
  '1/4+z,3/4+x,3/4-y'
  '3/4+z,1/4+x,3/4-y'
  '3/4+z,3/4+x,1/4-y'
  '1/4+x,3/4+z,3/4-y'
  '3/4+x,1/4+z,3/4-y'
  '3/4+x,3/4+z,1/4-y'
  '1/4+y,3/4+x,3/4-z'
  '3/4+y,1/4+x,3/4-z'
  '3/4+y,3/4+x,1/4-z'
  '1/4+z,3/4+y,3/4-x'
  '3/4+z,1/4+y,3/4-x'
  '3/4+z,3/4+y,1/4-x'
loop_
_atom_type_symbol
_atom_type_oxidation_number
  Ta5+   5.000
  U4+    4.000
  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
  Ta1   Ta5+  16 c 0.125 0.125 0.125 1.  0 d
  U1    U4+   16 d 0.625 0.625 0.625 0.5  0 d
  O1    O2-    8 b 0.5 0.5 0.5 1.  0 d
  O2    O2-   48 f 0.20(1) 0. 0. 1.  0 d