data_9004547
_chemical_name 'Loparite-(Ce)'
loop_
_publ_author_name
'Mitchell R H'
'Burns P C'
'Chakhmouradian A R'
_journal_name_full "The Canadian Mineralogist"
_journal_volume 38
_journal_year 2000
_journal_page_first 145
_journal_page_last 152
_publ_section_title
;
 The crystal structures of loparite-(Ce)
 Sample: Loparite K
;
_chemical_formula_sum 'Na.54 La.09 Ce.17 Pr.01 Nd.03 Ca.09 Sr.04 (Ti.76 Nb.23 Ta
_cell_length_a 5.5108
_cell_length_b 5.5084
_cell_length_c 7.7964
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 236.665
_symmetry_space_group_name_H-M 'P b n m'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  'x,y,1/2-z'
  '-x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  '1/2-x,1/2+y,z'
  '1/2+x,1/2-y,-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_Uiso_or_equiv
Na  -0.00340   0.50030   0.25000   0.54000   0.01790
La  -0.00340   0.50030   0.25000   0.09000   0.01790
Ce  -0.00340   0.50030   0.25000   0.17000   0.01790
Pr  -0.00340   0.50030   0.25000   0.01000   0.01790
Nd  -0.00340   0.50030   0.25000   0.03000   0.01790
Ca  -0.00340   0.50030   0.25000   0.09000   0.01790
Sr  -0.00340   0.50030   0.25000   0.04000   0.01790
Ti   0.00000   0.00000   0.00000   0.76000   0.01170
Nb   0.00000   0.00000   0.00000   0.23000   0.01170
Ta   0.00000   0.00000   0.00000   0.01000   0.01170
O1   0.05080  -0.00160   0.25000   1.00000   0.03440
O2   0.24280   0.25100  -0.01810   1.00000   0.05970