Aging, rejuvenation and memory due to domain-wall contributions in RbH ₂ PO ₄ single crystals

Abstract

Isothermal aging is studied for RbH2PO4 crystals which were slowly cooled below the ferroelectric phase-transition temperature Tc. Aging is strong within the temperature range Tc > T > T f of high dielectric domain-wall contributions, but less pronounced below the domain-freezing temperature T f . Aging and thermal rejuvenation, setting in if cooling is renewed, are discussed in terms of reconformations of collectively pinned domain walls. Dielectric anomalies, detected upon subsequent reheating in the vicinity of the previous dwelling temperatures, are ascribed to a spatial modulation of the defect structure, carrying memory of the domain-wall roughness established during aging.

Multiple aging mechanisms in ferroelectric deuterated potassium dihydrogen phosphate

“…Here we show that there are very long-time aging components that can remove most of the domain-wall response at the aging field, as extreme as what has been seen in RDP 8 , even for temperatures just a little below TC. Although the very long-time results have only been taken at zero field, we show that aging for times of several days is approximately independent of dc field, but not of field history.…”

“…The hysteresis is expected if the domain wall positions do not follow the equilibrium position determined by the field, but lag behind their equilibrium positions due to partial pinning by disorder. [8,22] At fields ~ 3000 V/cm away from the aging field, the effects on e' become small.…”

“…On the other hand, a closely related ferroelectric, RbH2PO4 (RDP), also shows giant aging effects for which such diffusion mechanisms are not considered to be a major source, [8] raising the question of whether multiple types of major aging effects are present in DXKDP. In this paper we show that the simple model of H diffusing to domain walls can account for the properties of only one component of the aging effect, and that at least two other major aging effects are also present.…”

Cole-Cole Analysis of a New Lead Free NaNbO3-Sr0.5NbO3-LiNbO3Ferroelectric Relaxor

“…(iii) More interesting, a low frequency relaxation is clearly revealed at room temperature RT which is the freezing temperature deduced from the VF law. As the sample has spent a long time at RT before the experiments were performed, one could invoke aging phenomena which are common in RFE, but several studies has shown that aging results in a decrease of both the real and imaginary parts of the dielectric constant [18,19]. Thus, we infer that the ε maximum observed at RT is related to the freezing of the polarized regions inside NSLN.…”

Viscoelastic, dielectric, and thermal properties of BaTiO3‐3%KNbO3

“…In most cases, full rejuvenation cannot always be completed considering the time factor, and sample is usually partial rejuvenated [17]. The minor divergence in modulus behaviors over thermal cycles could be attributed to this oxygen vacancy effect.…”