Ferroelectricity in (Pb${}_y$Sn${}_{1-y}$)${}_2$P${}_2$S${}_6$ mixed crystals and random field BEG model

K. Z. Rushchanskii, R. M. Bilanych, A. A. Molnar +6

For Sn${}_2$P${}_2$S${}_6$ ferroelectrics the second order phase transitions line is observed until reaching the tricritical point at transition temperature lowering to 250 K by compress…