Ferroelectric and antiferroelectric properties of (Na_0.5Bi_0.5)TiO3-SrTiO3 solid solution ceramics

Ultrahigh electromechanical response in (1−x)(Na0.5Bi0.5)TiO3-xBaTiO3 single-crystals via polarization extension

“…29,[31][32][33] Previously structural studies indicated that (1-x)NBT-xBT near the MPB does not have a notable deviation from cubic symmetry in the temperature range of 25 and 350 C. 23,27,[34][35][36] We conjecture that T d is related to an a À a À a À ! a 0 a 0 c þ octahedral tilting transition.…”

“…The so-called depolarization temperature (T d ) inherent to NBT (Ref. 29) was found to be decreased to T d ¼ 145 C, below which notably frequency dispersion was found. The temperature T d was frequency dependent and shifted to higher temperature with increasing frequency.…”

Determination of depolarization temperature of (Bi1/2Na1/2)TiO3-based lead-free piezoceramics

“…In BNT-based systems, there is a weakly polar intermediate phase, 12 which occurs between the T d and T m . [13][14][15] The depolarization temperature is not unambiguously and universally defined. In the European standard on piezoelectric properties, 16 depolarization is defined as the reduction of remanent polarization because of temperature and other influences.…”

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

“…366 The increase in lattice parameter is accompanied by a gradual decrease of the unit cell distortion from R to a pseudocubic below 20 mol % ST, as displayed in Figure 3.8 However, further ST content leads to a considerable change of the R distortion at room temperature and vanishing non-cubic distortions 365,366 and relaxor features. 258,362,365,366 Initially, this relaxor state was termed an antiferroelectric state 353 ; however, subsequent reports discarded antiferroelectricity in the system. 366 366 Based on the results from XRD, dielectric properties, and Raman spectoscropy analysis, Rout et al 363 proposed a phase diagram for the BNT-ST system (Figure 3.9).…”

“…The lead-free solid solution between BNT and ST was first reported by Sakata and Masuda 353 in 1974 with the aim to shift the phase transitions of pure BNT to lower temperatures, thus allowing a systematic study of the functional properties of the system. Subsequent studies, have demonstrated that increasing ST content in BNT-based materials leads to destabilization of the long-range ferroelectric state and decreased as well as .…”