Decomposition of ferroelectric LiH3(SeO3)2

Article abstract of DOI:10.1016/0038-1098(93)90862-H

Previously reported surface transformation of ferroelectric LiH₃(SeO₃)₂ from crystalline to amorphous state at T_a = 80 °C is studied by means of the thermal analysis (DTA, TGA) and the observation of X-ray diffraction patterns. We find an endothermic reaction (DTA) as well as a reduction of the sample weight (TGA) starts at about T_a with increasing temperature. In accordance with this, X-ray halo intensity gradually develops above about T_a at the expense of Bragg diffraction intensity. It is concluded that the surface transformation originates from the decomposition having a long characteristic time.