Effect of electric fields and mechanical stresses on switching and domain structure realignment in NaH₃(SeO₃)₂crystals

Study of the ferroelectric–paraelectric phase transition of NaH3(SeO3)2 single crystals by 1H and 23Na NMR

“…Crystals of alkali trihydrogen selenites are an important group of hydrogen-bonded ferroelectrics that have very interesting properties. One such alkali trihydrogen selenite is NaH 3 (SeO 3 ) 2 , which undergoes two phase transitions [1][2][3]: from a paraelectric phase, phase I, to a ferroelectric phase, phase II, at 194 K, and subsequently from phase II to a ferroelectric phase, phase III, at about 100 K. In the phase between the two transition points, NaH 3 (SeO 3 ) 2 is both ferroelectric and ferroelastic [4,5]. The phases are denoted as phase I, II, and III in the order of descending temperature.…”