A neutron diffraction study of the ferroelectric transition of CsH2PO4

Abstract

Hydrogen atoms in ferroelectric phase of CsH2PO4 have been located from low temperature neutron diffraction experiment. Chains of hydrogen bonds extending to both the crystallographic b- and c-axes are confirmed. The hydrogen atom in a shorter O–H··O bond becomes ordered at low temperature phase with bond length O-H=1.02 A auad H··O=1.46 A. Structural change below Tc shows that the hydrogen ordering accompanies a slight rotation of PO4 tetrahedron about the one P–O bond. © 1980, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.