Wydział Chemii

Kazimierz Orzechowski

Grażyna Bator

Ryszard Jakubas

1995

Ferroelectrics

166

139-148

10.1080/00150199508223582

Naukowa

Angielski

Artykuł

In previous paper we presented studies of the ferroelectric-paraelectric phase transition in (CH3NH3),Bi2Br, I crystal using the non-linear dielectric effect (NDE) technique. I We found that the adopted method gives unique description of polarisation reversal process in the vicinity of phase transition. The NDE technique was originally developed for investigations of liquids in strong electric field, and the measurements consist in comparison of the electric permittivity measured at low and high intensity electric field. In (CH3NH3),Bi2Br, I crystal the NDE increment (defined as AE = E ( E ) -E ( E + 0 ) ) is a temperature dependent quantity in the vicinity of phase transition temperature. When the temperature is approaching the critical one, the absolute value of AE increases rapidly. In paraelectric phase the AE increment is found to be negative, and in ferroelectric phase could be both positive and negative depending on the DC bias polarization, duration time of DC impulses and...

ferroelectric, phase transition, Nonlinear dielectric effect

https://doi.org/10.1080/00150199508223582