Enhanced electrical properties of (Li,Ce) co-doped Sr(Na_0.5Bi_0.5)Bi₄Ti₅O₁₈high temperature piezoceramics

Abstract

Lead-free piezoelectric ceramics with the formula of Sr1−x(Li,Ce)x/2(Na0.5Bi0.5)Bi4Ti5O18 (LCSNBT-x, x = 0.0, 0.1, 0.2, 0.3, 0.4), were prepared by a conventional solid-state reaction method.

Enhanced dielectric and ferroelectric responses in La3+/Ti4+ co-substituted SrBi2Ta2O9 Aurivillius phase

“…It is noticed that the P-E loops of both samples are unsaturated, implying that the domains are not fully aligned at the maximum applied electric fields of 190 kV/cm. Although unsaturated, both samples adopt the typical non-linear hysteresis with opening loops, indicating the ferroelectric behavior at RT [8,27]. The measured remanent polarization (P r ) and the coercive field (E c ) values of the SBT are about 0.31 μC/cm 2 and 128.2 kV/cm, respectively.…”

Charge–Ferroelectric Transition in Ultrathin Na0.5Bi4.5Ti4O15 Flakes Probed via a Dual‐Gated Full van der Waals Transistor

“…Aurivillius bismuth layer‐structured ferroelectric (BLSF) Na 0.5 Bi 4.5 Ti 4 O 15 (NBIT) has received significant attention in virtue of their high Curie temperature of ≈650 °C, high resistivity, low leakage current, low dielectric loss, low aging rate, and excellent thermal stability, which are attractive for high‐temperature piezoelectric devices and ferroelectric nonvolatile random‐access memory storage devices. [ 20–25 ] A high dielectric constant of 140–180 at room temperature has been reported in the NBIT synthesized by solid‐state reaction process, and it is stable over an ultrawide temperature range from room temperature to ≈400 °C. [ 26 ] However, NBIT prepared by traditional solid‐state reaction methods inevitably suffers from these issues, such as significant impurity phase, irregular flake shape, rough surface.…”

Effect of ZnSnO3 on dielectric and ferroelectric properties of Sr2Bi4Ti5O18 ceramics

“…20 The ferroelectric and dielectric properties of this ceramic can be tuned or improved by A-site, and B-site substitutions, with sintering aids, making solid solutions with other ferroelectric materials or composites. [24][25][26][27][28][29][30][31][32][33] In another instance, the replacement of Sr 2+ cations at the A-site by the (Na + , Bi 3+ ) and (Li + , Ce 3+ ) or a combination led to improved piezoelectric and ferroelectric properties along with high Curie temperature when compared to that of pure SBT. 24,26,27 For (1 − x) SBT + xBiFeO 3 (where x = 0.3) ceramics' lower leakage current density (0.9 times) and high remanent polarization (1.3 times) were reported compared to that of pure SBT ceramics.…”

“…[24][25][26][27][28][29][30][31][32][33] In another instance, the replacement of Sr 2+ cations at the A-site by the (Na + , Bi 3+ ) and (Li + , Ce 3+ ) or a combination led to improved piezoelectric and ferroelectric properties along with high Curie temperature when compared to that of pure SBT. 24,26,27 For (1 − x) SBT + xBiFeO 3 (where x = 0.3) ceramics' lower leakage current density (0.9 times) and high remanent polarization (1.3 times) were reported compared to that of pure SBT ceramics. 31 The composite (1:1) of SBT (n = 4) and SBT (n = 5) has shown improved temperature stability of the dielectric properties.…”

“…For instance, 645 nm (average grain) sized SBT ceramics obtained by the sol–gel route have shown the highest remanent polarization (2 P r = 16.4 μC/cm 2 ) as well as the highest piezoelectric coefficient ( d 33 = 22 pCN −1 ) when compared to that of 115 nm (2 P r = 0.98 μC/cm 2 and d 33 = 10 pCN −1 ) and 1427 nm (2 P r = 13.1 μC/cm 2 and d 33 = 17 pCN −1 ) sized SBT ceramics obtained by the same method 20 . The ferroelectric and dielectric properties of this ceramic can be tuned or improved by A‐site, and B‐site substitutions, with sintering aids, making solid solutions with other ferroelectric materials or composites 24–33 . In another instance, the replacement of Sr 2+ cations at the A‐site by the (Na + , Bi 3+ ) and (Li + , Ce 3+ ) or a combination led to improved piezoelectric and ferroelectric properties along with high Curie temperature when compared to that of pure SBT 24,26,27 .…”