Crystal Structure of CsH₃(SeO₃)₂ at Low Temperature Range

Abstract

The crystal of CsH₃(SeO₃)₂ was confirmed to be triclinic system with the space group P and to have a superlattice structure below the antiferroelectric phase transition temperature (T_N = 149 K). The crystal structure was studied at 103 K below T_N by means of the single crystal x-ray diffraction. The final discrepancy factor was reduced to 0.0645. The structure analysis pointed out that all possible positions of atoms are in the ordering state below T_N. In order to ascertain the antiferroelectric state in the low phase, the pseudo-moments proportional to the displacements are assumed as the dipole moment of SeO₃ tetrahedron.

Keywords:

• CsH₃(SeO₃)₂
• hydrogen bond
• x-ray
• crystal structure