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