data_global _chemical_name_mineral 'Selenium' loop_ _publ_author_name 'Akahama Y' 'Kobayashi M' 'Kawamura H' _journal_name_full 'Japanese Journal of Applied Physics' _journal_volume 31 _journal_year 1992 _journal_page_first 1621 _journal_page_last 1624 _publ_section_title ; Structural study on pressure-induced phase transition from beta-Po type to bcc in selenium at 140 GPa Sample: at P = 66 GPa Note: structure known as beta-Po type, phase Se V ; _database_code_amcsd 0012740 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Se' _cell_length_a 3.965 _cell_length_b 3.965 _cell_length_c 3.091 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 42.084 _exptl_crystal_density_diffrn 9.347 _symmetry_space_group_name_H-M 'R -3 m' loop_ _space_group_symop_operation_xyz 'x,y,z' '2/3+x,1/3+y,1/3+z' '1/3+x,2/3+y,2/3+z' 'x,x-y,z' '2/3+x,1/3+x-y,1/3+z' '1/3+x,2/3+x-y,2/3+z' 'y,x,-z' '2/3+y,1/3+x,1/3-z' '1/3+y,2/3+x,2/3-z' '-x+y,y,z' '2/3-x+y,1/3+y,1/3+z' '1/3-x+y,2/3+y,2/3+z' '-x,-x+y,-z' '2/3-x,1/3-x+y,1/3-z' '1/3-x,2/3-x+y,2/3-z' '-y,-x,z' '2/3-y,1/3-x,1/3+z' '1/3-y,2/3-x,2/3+z' 'x-y,-y,-z' '2/3+x-y,1/3-y,1/3-z' '1/3+x-y,2/3-y,2/3-z' 'y,-x+y,-z' '2/3+y,1/3-x+y,1/3-z' '1/3+y,2/3-x+y,2/3-z' '-x+y,-x,z' '2/3-x+y,1/3-x,1/3+z' '1/3-x+y,2/3-x,2/3+z' '-x,-y,-z' '2/3-x,1/3-y,1/3-z' '1/3-x,2/3-y,2/3-z' '-y,x-y,z' '2/3-y,1/3+x-y,1/3+z' '1/3-y,2/3+x-y,2/3+z' 'x-y,x,-z' '2/3+x-y,1/3+x,1/3-z' '1/3+x-y,2/3+x,2/3-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Se 0.00000 0.00000 0.00000