data_1006068
_chemical_name_systematic
;
Erbium calcium barium nickel oxide (1.8/0.2/1/1/5)
;
_chemical_formula_structural       '(Er1.78 Ca0.22) Ba Ni O5'
_chemical_formula_sum              'Ba Ca.22 Er1.78 Ni O5'
_publ_section_title
;
Hole and electron doping of R~2~BaNiO~5~ (R=rare earths)
;
loop_
_publ_author_name
  'Alonso, J A'
  'Rasines, I'
  'Rodriguez-Carvajal, J'
  'Torrance, J B'
_journal_name_full                 'Journal of Solid State Chemistry'
_journal_coden_ASTM                JSSCBI
_journal_volume                    109
_journal_year                      1994
_journal_page_first                231
_journal_page_last                 240
_cell_length_a                     3.7423(2)
_cell_length_b                     5.7416(3)
_cell_length_c                     11.2729(7)
_cell_angle_alpha                  90
_cell_angle_beta                   90
_cell_angle_gamma                  90
_cell_volume                       242.2
_cell_formula_units_Z              2
_symmetry_space_group_name_H-M     'I m m m'
_symmetry_Int_Tables_number        71
_symmetry_cell_setting             orthorhombic
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  'x,-y,-z'
  '-x,y,-z'
  '-x,-y,z'
  '-x,-y,-z'
  '-x,y,z'
  'x,-y,z'
  'x,y,-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,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,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '1/2+x,1/2+y,1/2-z'
loop_
_atom_type_symbol
_atom_type_oxidation_number
  Ca2+   2.000
  Er3+   3.000
  Ba2+   2.000
  Ni2+   2.220
  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
  Ca1   Ca2+   4 j 0.5 0. 0.2038(1) 0.112(24)  0 d
  Er1   Er3+   4 j 0.5 0. 0.2038(1) 0.888  0 d
  Ba1   Ba2+   2 c 0.5 0.5 0. 1.  0 d
  Ni1   Ni2+   2 a 0. 0. 0. 1.  0 d
  O1    O2-    8 l 0. 0.2397(3) 0.1481(1) 1.  0 d
  O2    O2-    2 a 0.5 0. 0. 1.  0 d
_refine_ls_R_factor_all            0.0324