Archerite Frazer B C, Pepinsky R Acta Crystallographica 6 (1953) 273-285 X-ray analysis of the ferroelectric transition in KH2PO4 Sample: at T = 116 K Locality: synthetic, low-temperature form _database_code_amcsd 0009155 10.53 10.44 6.90 90 90 90 Fdd2 atom x y z occ Biso K 0 0 .512 .46 P 0 0 0 .39 O1 .116 .035 .136 .5 .37 OH1 .116 .035 .136 .5 .37 O2 -.035 .116 -.124 .5 .37 OH2 -.035 .116 -.124 .5 .37