Phase transitions in PZT-95/5 ceramics studied by dielectric and pyroelectric measurements: unusual properties in the vicinity of the antiferroelectric-ferroelectric phase transition

Abstract

The antiferroelectric-two ferroelectric (FR(LT)-FR(HT))-paraelectric phase sequence was ascertained in PZT-95/5 ceramics. Unusual behaviour of the temperature characteristics of electric permittivity, tan delta , remanent polarization and pyroelectric current was observed in the range of diffuse transition between the AFE and FE phases. The influence of external and internal bias electric fields as a possible reason for this behaviour is discussed.

Effects of aging and annealing on the polar and antiferrodistortive components of the antiferroelectric transition in PZT

“…24 As mentioned in the Introduction and in the previous study, 13 observations of exceptionally large thermal hystereses and slow kinetics of the AFE transition in undoped and variously doped PZT have been done with various techniques. A large thermal hysteresis and coexistence of R3m, R3c and P bam phases result from dielectric and pyroelectric measurements on PZT with x (Ti) = 0.05 25 and with Raman scattering in Nb-doped PZT with x ≤ 0.03, 26 while TEM observations 27,28 provide additional information on the local octahedral tilting, and are consistent with the idea that the R3m phase at low x is already tilted, though with a disordered or incommensurate pattern. The nucleation of the AFE phase has been followed also directly with a polarized microscope, 29 finding that its athermal character in pure PbZrO 3 , namely independent of thermal fluctuations and hence unchanged under stationary conditions, is changed by the Ti substitution into strongly isothermal, where the evolution can slowly proceed at constant temperature.…”

Effects of aging and annealing on the polar and antiferrodistortive components of the antiferroelectric transition inPbZr1−xTixO3

“…A large thermal hysteresis and coexistence of R3m, R3c and P bam phases result from dielectric and pyroelectric measurements on PZT with x (Ti) = 0.05 25 and with Raman scattering in Nb-doped PZT with x ≤ 0.03, 26 while TEM observations 27,28 provide additional information on the local octahedral tilting, and are consistent with the idea that the R3m phase at low x is already tilted, though with a disordered or incommensurate pattern. The nucleation of the AFE phase has been followed also directly with a polarized microscope, 29 finding that its athermal character in pure PbZrO 3 , namely independent of thermal fluctuations and hence unchanged under stationary conditions, is changed by the Ti substitution into strongly isothermal, where the evolution can slowly proceed at constant temperature.…”

A comprehensive review on the progress of lead zirconate-based antiferroelectric materials

“…Subsequently, pyroelectric effect was also observed in Pb(Zr 0.95 Ti 0.05 )O 3 and Nb-doped Pb(Zr 0.92 Ti 0.08 )O 3 AFE ceramics[228,229]. With increasing temperature, Pb(Zr 0.95 Ti 0.05 )O 3 ceramics underwent a series of phase switching, A O -F R(LT) , F R(LT) -F R(HT) and F R(HT) -PE, at 88, 160, and 243 o C, and large pyroelectric current densities in the order of 10 -8 A/cm 2 were detected in the vicinity of the phase transition temperature.…”

“…No explanation was available for such a fluctuation in the properties of the PLZ AFE thin films. (B) PZT 95/5One of the early studies on temperature-dependent phase transition of PZT 95/5 ceramics was reported by Handerek and Ujma[175]. A multi-phase transition, AFE O -FE R -FE T -PE, was observed at 110, 151…”