data_global
_chemical_name_mineral 'Tantalaeschynite-(Eu)'
loop_
_publ_author_name
'Jacobsen H'
'Lissner F'
'Manek E'
'Meyer G'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 211 
_journal_year 1996
_journal_page_first 547
_journal_page_last 548
_publ_section_title
;
 Crystal structures of dieuropium(II) ditantalum heptoxide,
 Eu2Ta2O7 and europium(II) ditantalum hexoxide, EuTa2O6
;
_database_code_amcsd 0018933
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Eu Ta2 O6'
_cell_length_a 11.02
_cell_length_b 7.640
_cell_length_c 5.610
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 472.322
_exptl_crystal_density_diffrn      8.576
_symmetry_space_group_name_H-M 'P n m a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,z'
  '-x,1/2+y,-z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,1/2-y,1/2-z'
  '1/2+x,y,1/2-z'
  '1/2-x,-y,1/2+z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Eu   0.04020   0.25000   0.53870
Ta   0.14237   0.99594   0.03770
O1   0.97400   0.03500   0.22100
O2   0.21400   0.04800   0.36100
O3   0.14400   0.25000   0.96700
O4   0.37200   0.25000   0.64300
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
Eu 0.01400 0.00870 0.01360 0.00000 0.00100 0.00000
Ta 0.00820 0.00800 0.01190 0.00000 0.00020 0.00000
O1 0.01600 0.00800 0.01600 0.00000 0.00200 -0.00200
O2 0.01000 0.00800 0.01600 -0.00100 0.00200 -0.00400
O3 0.03000 0.00700 0.01600 0.00000 0.00400 0.00000
O4 0.01900 0.00200 0.01700 0.00000 0.00000 0.00000