PHENOMENON OF MULTIPLE FIELD-INDUCED PHASE-TRANSITION IN PLZST ANTIFERROELECTRIC CERAMICS

The multiple field-induced phase transition in 4 at. % La modified Pb( Zr, Sn. Ti) O-3 family with temperature from - 40 degrees C to 45 degr ees C in reported. Two electric field-induced transitions from a metas table antiferroelectric phase to two ferroelectric phases are observed is polarization at the applied field of 4 MV/m. The critical field of phase transition between two ferroelectric phases is not larger than 2.5 MV/m, about ten to twenty percent of that ever found in PZT based ceramics. Lattice structure is shown to be orthorhombic by X-ray diffr action. Dielectric investigation reveals a relaxer-like ferroelectric behavior. Temperature-electric field phase diagram is also presented. An appreciate kind of materials is provided to investigate multiple fi eld-induced phase transition with PZT-based ceramics.