UPS Pearson W B Zeitschrift fur Kristallographie 171 (1985) 23-39 The Cu2Sb and related structures _database_code_amcsd 0010902 3.813 3.813 7.981 90 90 90 P4/nmm atom x y z P 0 0 0 S .5 0 .65 U .5 0 .265