Abstract
Ferroelastic phase transition in TlH 2 PO 4 has been investigated by means of neutron diffraction using single-crystal sample. The average structures of TlH2PO 4 in the phases I and II have been determined. The crystal analysis with anisotropic thermal parameters in the phase I has been carried out for the 2-site model of O atom that the oxygen atoms forming the PO 4 tetrahedron are disorder while other atoms are order. The result means that the ferroelastic phase transition is mainly caused by the rotational motion of PO 4 tetrahedra.
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