Among all kinds of lead-free piezoelectric ceramics, bismuth ferrite (BiFeO 3, BFO)-based ceramic with large strain response has been proved to be a promising candidate for actuator devices [3]. However, the device operation depends on ferroelectric polarization switching, and therefore, the reliability and long-term stability during …

Bismuth ferrite ceramics modified with 12 mol% gadolinium possess a multiferroic rhombohedral R3c matrix phase with secondary phases scattered throughout the microstructure. The Bi 0.88 Gd 0.12 FeO 3 is ferromagnetic, with a coercive field of 8 kOe and remanent magnetization of 0.2 emu·g −1, confirming that rare earth substitution …

Fe doped sodium bismuth titanate ceramics were synthesized by solid state reaction. • Improved ferroelectric and ferromagnetic nature was obtained. • A reinforced self-biased magnetoelectric coupling of 7.38 mV/cmOe was observed. • Electric field induced non-180° domain alignment led to enhanced multiferroic behavior.

Origin of Polarization in Bismuth Sodium Titanate-Based Ceramics. Hangfeng Zhang., Marcin Krynski., A. Dominic Fortes., Theo Graves Saunders., …

An electric-field-induced strain in ferroelectric materials has extensive applications in actuators and sensors. BiFeO 3 (BFO) ceramic is a promising candidate for high-temperature electromechanical coupling applications due to its exceptionally high Curie temperature (T c ∼ 825 °C). Here, we reported an enhanced electric-field-induced strain …

The microscopic origin of the grain size effects on the dielectric, piezoelectric, and thermal depoling properties of Aurivillius phase Bi 3.15 Nd 0.85 Ti 3 O 12 was investigated. Using atomic force microscopy, domain walls were observed in micrometer grain size ceramics, but gradually disappeared with reducing grain size and were not …

Here we observed a large strain of lead-free BiFeO 3 ternary ceramics by the composition design [(0.70-x)Bi 1.05 FeO 3-0.30BaTiO 3-xBi(Mg 2/3 Nb 1/3)O 3].Positive temperature dependence of strain under E = 4 kV/mm can be observed in the ceramics with x = 0.07.Large strain property (S = 0.32% and d 33 * = 800 pm/V) and low …

Effects of oxide additives (Bi2O3, MnO2, La2O3, Sm2O3, SnO2, and Nb2O5) on structure and properties of 0.70Bi1.05FeO3–0.30BaTiO3 ceramics were investigated. Their microstructure and electrical properties were dependent on the types and contents of oxide additives. A large piezoelectric constant (d 33) of 135–200 pC/N …

The MPB composition with rhombohedral-tetragonal phase coexistence demonstrates enhanced electromechanical properties, including T C of 380 °C, d 33 * of 395 pm V –1, d 33 of 302 pC N –1, and k p of 50%, which is comparable to that of commercial PZT-5A ceramics.. The in-situ d 33 reached 577 pC N –1 at 209 °C and 530 …

July 2017 Nonstoichiometric Effects in the Leakage Current and Electrical Properties of Bismuth Ferrite Ceramics 325 (1) Here, R is the resistance [Ω], A is the specimen cross-section.

Bismuth doped Sr 2 Fe 1.5 Mo 0.5 O 6-δ double perovskite as a robust fuel electrode in ceramic oxide cells for direct CO 2 electrolysis. Author links open overlay panel Meiting Yang a 1, Zhen Yao b 1, Shuai Liu a, Jun Wang a, Anwei Sun c, Haoran Xu c, Guangming Yang a, Ran Ran a, Wei Zhou a, Gang Xiao c, Zongping Shao a d.

Dielectric, ferroelectric, and piezoelectric properties including phase transition temperatures of perovskite-type bismuth sodium titanate, (Bi1/2Na1/2)TiO3 [BNT]-based lead-free piezoelectric ceramics have been reviewed from the results obtained by our group being superior candidates for lead-free piezoelectric materials to reduce environmental …

The scanning electron micrographs of the glass ceramic samples obtained by thermal treatment of the glasses at different temperatures are presented in Fig. 3, Fig. 4.It can be observed that the surface microstructures of BBB500 and SBB500 (Figs. 3 a & 4 a) contain crystalline aggregates comprising numerous randomly oriented fine …

Phase structure and properties of sodium bismuth titanate lead-free piezoelectric ceramics - ScienceDirect. Progress in Materials Science. Volume 122, …

Bismuth ferrite (BiFeO3, BFO) possesses very large spontaneous polarization, which provides a great potential in dielectric energy-storage capacitors. However, the presence of large remanent polarization heavily restricts the achievement of excellent performance in the energy storage field. Herein we designed local …

In recent years the microwave sintering has been utilized for the synthesis of materials in enhancement of the properties. In this paper strontium bismuth niobate (Sr 0.8 Bi 2.2 Nb 2 O 9:SBN) bulk ceramic has been synthesized by microwave reactive sintering and conventional heating techniques.A relative density of 99.6% has been achieved for …

However, the effect of liquid phase on particle transport has not been explained definitely. Moreover, flash sintering has a prominent contribution in the preparation ceramics with highly volatile species, such as KNbO 3 [ 24 ], NaNbO 3 [ 25] and BiFeO 3 [ 26 ]. Sodium bismuth titanate (Na 0.5 Bi 0.5 )TiO 3 (NBT) is the best-known electronic ...

Bismuth titanate and lanthanum-doped bismuth titanate ceramics were prepared from freeze-dried powders employing conventional solid state reaction and sintering procedures. The sintering process was carried out at 1150 °C from 4 up to 48 h. X-ray diffraction analysis showed that preferred orientation was reduced in bismuth …

Journal of the American Ceramic Society (JACerS) is a leading ceramics journal publishing research across the field of ceramic and glass science and engineering. Abstract In this work, …

Journal of the American Ceramic Society (JACerS) is a ... The bismuth layer-structured ferroelectric (BLSF) bismuth titanate-ferrite (Bi 5 Ti 3 FeO 15, BTF) has recently attracted considerable attention because of its high Curie temperature (T C) of ∼761°C. However, the piezoelectric properties of BTF-based compounds have not been ...

Ca0.4Sr0.6Bi4Ti4O15 ceramics with a-axis preferred orientation were prepared by a solid-state reaction method. The cylindrical Ca(0.4)Sr(0.6)Bi(4)Ti(4)O(15)ceramics were cut into two types of ...

Lustre glazes can be quite unpredictable so I take notes during every firing to learn from my mistakes and recreate successful results. BASE GLAZE RECIPE. Calcium borate frit 60g. Nepheline …

The classical view of the structural changes that occur at the ferroelectric transition in perovskite-structured systems, such as BaTiO3, is that polarization occurs due to the off-center displacement of the B-site cations. Here, we show that in the bismuth sodium titanate (BNT)-based composition 0.2(Ba0.4Sr0.6TiO3)–0.8(Bi0.5Na0.5TiO3), this model …

Bismuth-based Piezoelectric Ceramics. Important ferroelectric or antiferroelectric oxide ceramics for dielectric, ferroelectric, piezoelectric, electrostrictive, and/or pyroelectric …

To understand the mechanism for this discrepancy, the flexoelectric response of the Na 0.5 Bi 0.5 TiO 3 –BaTiO 3 (NBBT) ceramics of different compositions was systematically studied. We show that the measured flexoelectric response of the NBBT ceramics is mainly from the piezoelectric response of the spontaneously polarized …

Bismuth layer structured lead free piezoelectric ceramics in the system Sr1−x Ca x Na0.5Bi4.5Ti5O18 + 1 wt% CeO2 (SC x NBTC; x = 0, 0.25, 0.5, 0.75 and 1) have been prepared through the conventional solid-state reaction method. X-ray diffraction measurement indicates that a single phase layered perovskite was obtained for all …

In this study the samples of Bismuth ceramic superconductors were synthesized by the melt textured growth methods from a 2212 stoichiometric composition in order to obtain a large amount of pure ...

New lithium bismuth phosphate ceramic: crystal structure, microstructure, microwave dielectric properties and co-firing compatibility with aluminum electrode. …

An open-circuit voltage of 6.9 V was received on oriented ceramic bismuth ferrite (BFO) thin-film solar cells working in an "out-of-plane" mode. The above-band-gap voltage is strongly related to the crystallinity, orientation, and thickness of the BFO film contributing to the bulk photovoltaic effects, which have been further verified by powder X …

Sodium bismuth titanate-barium titanate (NBBT) piezoelectric ceramics have the characteristics of relaxed ferroelectrics. It is considered as the most promising lead …