Phase transition and dielectric properties of PbLa(Zr,Sn,Ti)O₃ antiferroelectric ceramics under external field

The influences of temperature, hydrostatic pressure on the dielectric constant (ε_r) and loss (tanδ) of PbLa(Zr,Sn,Ti)O₃ antiferroelectric ceramics were studied. Temperature-induced transitions from tetragonal antiferroelectric phase to cubic paraelectric phases and low-temperature section frequency dispersion were observed. Under hydrostatic pressure, poled antiferroelectric ceramics undergo phase transition from ferroelectric phase to antiferroelectric phase accompanying with releasing current. It has been found from experimental results that when applying hydrostatic pressure the ferroelectric-antiferroelectric phase transition temperature is decreased and antiferroelectric-paraelectric phase transition temperature is increased.