DIELECTRIC RELAXATION AND FREEZING EFFECT IN Sn<sub>2</sub>P<sub>2</sub>S<sub>6</sub>
oleh: M.M.Maior, Sh.B.Molnar, V.T.Vrabel, M.I.Gurzan, S.F.Motrja, Yu.M.Vysochanskii
| Format: | Article |
|---|---|
| Diterbitkan: | Institute for Condensed Matter Physics 2003-01-01 |
Deskripsi
The temperature-frequency studies of dielectric susceptibility in Sn<sub>2</sub>P<sub>2</sub>S<sub>6</sub>, Sn<sub>2</sub>P<sub>2</sub>Se<sub>6</sub>, (Pb<sub>y</sub>Sn<sub>1-y</sub>)<sub>2</sub>P<sub>2</sub>Se<sub>6</sub> and crystals at low temperatures are reported. The freezing relaxation dynamics has been observed in a temperature-frequency dependence of the dielectric properties in the crystals which are in a polydomain ferroelectric state as well as in the crystals (Pb<sub>y</sub>Sn<sub>1-y</sub>)<sub>2</sub>P<sub>2</sub>Se<sub>6</sub> with y > 0.4 which at low temperatures are in the incommensurate phase. The nature of the effect and its interrelation with dynamics of ferroelectric domain walls and incommensurate structure is discussed.