data_7222203
_publ_section_title
;
 Syntheses, structures and properties of some osmates(IV,V) adopting the
 pyrochlore and weberite structures
;
_journal_name_full               'Journal of Materials Chemistry'
_journal_page_first              2376
_journal_page_last               2382
_journal_volume                  12
_journal_year                    2002
_chemical_formula_sum            'Ca2 O7 Os2'
_chemical_name_systematic        'Ca2 (Os2 O7)'
_space_group_IT_number           74
_symmetry_space_group_name_Hall  '-I 2b 2'
_symmetry_space_group_name_H-M   'I m m a'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.2076
_cell_length_b                   10.1135
_cell_length_c                   7.3775
_cell_volume                     537.776
_citation_journal_id_ASTM        JMACEP
_cod_data_source_file            Reading_JMACEP_2002_1966.cif
_cod_data_source_block           Ca2O7Os2
_cod_original_cell_volume        537.7759
_cod_database_code               7222203
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-x,-y+1/2,z
x,-y,-z
-x,y+1/2,-z
-x,-y,-z
x,y-1/2,-z
-x,y,z
x,-y-1/2,z
x+1/2,y+1/2,z+1/2
-x+1/2,-y+1,z+1/2
x+1/2,-y+1/2,-z+1/2
-x+1/2,y+1,-z+1/2
-x+1/2,-y+1/2,-z+1/2
x+1/2,y,-z+1/2
-x+1/2,y+1/2,z+1/2
x+1/2,-y,z+1/2
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Os1 Os+5 0.25 0.25 0.25 1 0.0
O1 O-2 0 0.25 0.1615 1 0.0
Os2 Os+5 0 0 0.5 1 0.0
Ca1 Ca+2 0 0 0 1 0.0
O2 O-2 0 0.4037 0.728 1 0.0
Ca2 Ca+2 0.25 0.25 0.75 1 0.0
O3 O-2 0.2057 0.3833 0.4354 1 0.0
