Multiple Local Symmetries Result in a Common Average Polar Axis in High-Strain BiFeO3 -Based Ceramics

Abstract

This is a repository copy of Multiple local symmetries result in a common average polar axis in high-strain BiFeO3-based ceramics.

Bismuth Ferrite-Based Lead-Free High-Entropy Piezoelectric Ceramics

“…This improvement is attributed to the establishment of MPB coexisting R and C phases and at the crossover from typical ferroelectric to relaxor behavior at x = 0.40. The MPB, characterized by the coexistence of multiple polarization phases and dominated PNRs, reduces the energy barrier for polarization switching and enhances domain wall mobility, thereby resulting in enhanced ferroelectric and piezoelectric properties. , …”

“…Piezoelectric materials play a crucial role as core components in high-precision actuators, sensors, and transducers. − Currently, lead-based materials, like lead zirconate titanate (PZT), are widely used in commercial applications due to their exceptional piezoelectric properties. − However, lead-based materials contain more than 60% of highly toxic lead, which poses a significant environmental and health hazard. − Therefore, the exploration of new lead-free piezoelectric materials is of the utmost importance. Among the various lead-free material systems, BiFeO 3 (BF)-based lead-free ceramics are promising alternatives of lead-based materials because of their high Curie temperature ( T c ) and ferroelectric properties. − BF can be solidly dissolved with BaTiO 3 (BT), SrTiO 3 (ST), and other compounds with ABO 3 structure to form a morphotropic phase boundary (MPB), which is a well-known strategy to achieve high ferroelectric and piezoelectric properties. − The coexistence of multiple phases at the MPB reduces the energy barrier for polarization switch processes, enhances domain mobility, and leads to improved piezoelectric properties. ,− Notably, previous studies have demonstrated promising results for BF-based materials. For instance, Lee et al obtained piezoelectric coefficient ( d 33 = 402 pC/N) and T c = 454 °C in the MPB range by quenching 3 mol % Ga-doped BF–0.33BT ceramics, while Habib et al achieved d 33 = 436 pC/N and piezoelectric strain coefficient ( d 33 * = 550 pm/V) through Sm-doped BF–0.33BT quenching and a novel AC cyclic polarization method.…”

Ultrahigh Piezoelectric Response Obtained by Artificially Generating a Large Internal Bias Field in BiFeO3–BaTiO3 Lead‐Free Ceramics

“…[37] Additionally, BF-BT-NMN demonstrates a bipolar strain of 0.42% * between 67BF-33BT in this work and other materials that were known to possess giant piezoelectric effects at RT. [16,22,[51][52][53][54][55]23,26,27,33,37,[48][49][50] under a high electric field of 100 kV cm −1 . [23] In this work, poledaged 67BF-33BT ceramics achieves a high strain (𝜖 = 0.19%) and an extremely high piezoelectric coefficient (d 33 * = 942.05 pm V −1 ) when subjected to 20 kV cm −1 .…”

“…[16,22,[51][52][53][54][55]23,26,27,33,37,[48][49][50] under a high electric field of 100 kV cm −1 . [23] In this work, poledaged 67BF-33BT ceramics achieves a high strain (𝜖 = 0.19%) and an extremely high piezoelectric coefficient (d 33 * = 942.05 pm V −1 ) when subjected to 20 kV cm −1 . This comparison highlights the remarkable piezoelectric response of 67BF-33BT ceramics, especially under lower electric fields.…”

“…[6][7][8] Materials like barium titanate (BaTiO 3 , BT), [9][10][11][12] bismuth sodium titanate (Bi 0.5 Na 0.5 TiO 3 , BNT), [13][14][15] potassium sodium niobate (K 0.5 Na 0.5 NbO 3 , KNN), [16][17][18][19] and bismuth ferrite-barium titanate (BiFeO 3 -BaTiO 3 , BF-BT) materials have emerged as promising alternatives, each demonstrating considerable potential. [20][21][22][23][24] BF-BT ceramics, in particular, stand out as exceptional candidates for high-temperature applications in piezoelectric actuators due to their high Curie temperatures, commendable piezoelectric properties, and multiferroic characteristics. [25,26] Xun et al [26] have found that the (1−x)BF-xBT system exhibits a rhombohedral-cubic morphotropic phase boundary (MPB) within the composition range of 0.27 ≤ x ≤ 0.35, with the Curie temperature exceeding 400 °C for x < 0.35.…”