YbS1.7 Pearson W B Zeitschrift fur Kristallographie 171 (1985) 23-39 The Cu2Sb and related structures _database_code_amcsd 0010893 3.842 3.842 7.747 90 90 90 P4/nmm atom x y z S1 0 0 0 S2 .5 0 .66 Yb .5 0 .24