Archerite Levy H A, Peterson S W, Simonsen S H Physical Review 93 (1954) 1120-1121 Neutron diffraction study of the ferroelectric modification of potassium dihydrogen phosphate Note sample at T = 113 K Note: low temperature polymorph of archerite _database_code_amcsd 0015150 10.53 10.44 6.90 90 90 90 Fdd2 atom x y z Biso K 0 0 .512 .4 P 0 0 0 .6 O1 .1160 .0345 .1310 .6 O2 -.0345 .1160 -.1235 .6 H .1880 -.0375 .1335 2.