data_global
_amcsd_formula_title 'Y0.5Al2.7Si9.3N15.1O0.9'
loop_
_publ_author_name
'Izumi F'
'Mitomo M'
'Bando Y'
_journal_name_full 'Journal of Materials Science'
_journal_volume 19 
_journal_year 1984
_journal_page_first 3115
_journal_page_last 3120
_publ_section_title
;
 Reitveld refinements for calcium and yttrium containing alpha sialons
 _cod_database_code 1000029
;
_database_code_amcsd 0013086
_chemical_formula_sum 'Y.272 (Si4.62 Al1.38) (N7.52 O.48)'
_cell_length_a 7.82927
_cell_length_b 7.82927
_cell_length_c 5.70757
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 302.987
_exptl_crystal_density_diffrn      3.334
_symmetry_space_group_name_H-M 'P 3 1 c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x-y,-y,1/2+z'
  '-y,x-y,z'
  'y,x,1/2+z'
  '-x+y,-x,z'
  '-x,-x+y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Y   0.33333   0.66667   0.24200   0.27200
Si1   0.50870   0.08190   0.21300   0.77000
Al1   0.50870   0.08190   0.21300   0.23000
Si2   0.17060   0.25330   0.00200   0.77000
Al2   0.17060   0.25330   0.00200   0.23000
N1   0.00000   0.00000   0.00000   0.94000
O1   0.00000   0.00000   0.00000   0.06000
N2   0.33333   0.66667   0.65300   0.94000
O2   0.33333   0.66667   0.65300   0.06000
N3   0.34580  -0.04720  -0.00500   0.94000
O3   0.34580  -0.04720  -0.00500   0.06000
N4   0.32190   0.31800   0.24600   0.94000
O4   0.32190   0.31800   0.24600   0.06000