Lead-free Ceramics Research Articles

Enhancement of piezoelectric properties in KNN-based lead-free ceramics through controlled NaNbO3 seed addition and phase structure engineering

Enhancement of piezoelectric properties in KNN-based lead-free ceramics through controlled NaNbO3 seed addition and phase structure engineering

High-performance KNN-based piezoelectric ceramics for buzzer application

Abstract Piezoelectric ceramic material is an important component of piezoelectric buzzer, where the parameter of inverse piezoelectric coefficient (d 33 *) plays the decisive role in the performance of the buzzer. Here, we reported the manufacture and performance of lead-free ceramics (0.96(K0.5Na0.5)(Nb0.96Sb0.04)O3-0.04(Bi0.5Na0.5)ZrO3-1mol% Al2O3, abbreviated as KNNS-BNZ-1mol% Al2O3) based piezoelectric buzzer, compared with commercial (PbZr0.5Ti0.5O3, abbreviated as PZT) ceramics. Briefly, KNN-based ceramics had a typical perovskite structure and revealed the piezoelectric properties of d 33=480 pC/N, k p =0.62 and d 33 *=830 pm/V, compared to d 33=500 pC/N, k p=0.6 and d 33 *=918 pm/V of the commercial PZT-4 ceramics. Our results showed that the KNNS-BNZ-1% Al2O3 ceramics had a similar sound pressure level (SPL) performance over the testing frequency range with commercial PZT ceramics (even better in range of 3-4 kHz). These findings open vast possibilities toward the great application potential of the KNN-based piezoelectric ceramics.

Synchronous realization of remarkable energy-storage density and efficiency in (Na0.5Bi0.5)0.75Sr0.25TiO3-based lead-free ceramics at moderate electric fields

Synchronous realization of remarkable energy-storage density and efficiency in (Na0.5Bi0.5)0.75Sr0.25TiO3-based lead-free ceramics at moderate electric fields

Mechanism behind piezoelectricity and thermal expansion behaviour of BaTiO3-based lead-free ceramics with various strontium dopants

Mechanism behind piezoelectricity and thermal expansion behaviour of BaTiO3-based lead-free ceramics with various strontium dopants

Atomic-Scale High-Entropy Design for Superior Capacitive Energy Storage Performance in Lead-Free Ceramics.

Dielectric ceramics with high energy storage performance are crucial for the development of advanced high-power capacitors. However, achieving ultrahigh recoverable energy storage density and efficiency remains challenging, limiting the progress of leading-edge energy storage applications. In this study, (Bi1/2Na1/2)TiO3 (BNT) is selected as the matrix, and the effects of different A-site elements on domain morphology, lattice polarization, and dielectric and ferroelectric properties are systematically investigated. Mg, La, Ca, and Sr are shown to enhance relaxation behavior by different magnitudes; hence, a high-entropy strategy for designing local polymorphic distortions is proposed. Based on atomic-scale investigations, a series of BNT-based high-entropy compositions are designed by introducing trace amounts of Mg and La to improve the electric breakdown strength and further disrupt the polar nanoscale regions (PNRs). A disordered polarization distribution and ultrasmall PNRs with a minimum size of ≈1 nm are detected in the high-entropy ceramics. Ultimately, a high recoverable energy density of 10.1 Jcm-3 and an efficiency of 90% are achieved for (Ca0.2Sr0.2Ba0.2Mg0.05La0.05Bi0.15Na0.15)TiO3. Furthermore, it displays a high-power density of 584 MWcm-3 and an ultrashort discharge time of 27 ns. This work presents an effective approach for designing dielectric energy storage materials with superior comprehensive performance via a high-entropy strategy.

Lead-Free Ceramics in Prestressed Ultrasonic Transducers

Today’s ultrasonic transducers find broad application in diverse technology branches and most often cannot be replaced by other actuators. They are typically based on lead-containing piezoelectric ceramics. These should be replaced for environmental and health issues by lead-free alternatives. Multiple material alternatives are already known, but there is a lack of information about their technological readiness level. To fill this gap, a small series of prestressed longitudinally vibrating transducers was set up with a standard PZT material and two lead-free variants within this study. The entire process for building the transducers is documented: characteristics of individual ring ceramics, burn-in results, and free vibration and characteristics under load are shown. The main result is that the investigated lead-free materials are ready to use within ultrasonic bolted Langevin transducers (BLTs) for medium-power applications, when the geometrical setup of the transducer is adopted. Since lead-free ceramics need higher voltages to achieve the same power level, the driving electronics or the mechanical setup must be altered specifically for each material. Lower self-heating of the lead-free materials might be attractive for heat-sensitive processes.

Lead-free Sb-modified potassium sodium niobate ceramics for enhanced energy harvesting and superior performance in piezoelectric transducers for ultrasonic inspection

Lead-free Sb-modified potassium sodium niobate ceramics for enhanced energy harvesting and superior performance in piezoelectric transducers for ultrasonic inspection

Influence of the synthesis route on the electrical and mechanical properties of a modified 0.99 Bi0.5(Na0.8 K0.2)0.5 TiO3 − 0.01 Bi (Mg2/3Nb1/3) O3 lead-free ceramics

Influence of the synthesis route on the electrical and mechanical properties of a modified 0.99 Bi0.5(Na0.8 K0.2)0.5 TiO3 − 0.01 Bi (Mg2/3Nb1/3) O3 lead-free ceramics

Ultrahigh Energy Storage Performance in BiFeO3-Based Lead-Free Ceramics via Tuning Structural Homogeneity and Domain Engineering Strategies.

Lead-free ceramic-based dielectric capacitors are critical in electronics and environmental safety. Nevertheless, developing ideal lead-free ceramics with excellent energy storage properties remains a challenging task for practical applications. Herein, the enhanced relaxation behavior and increased breakdown electric field are utilized to realize the high energy storage behavior of (0.7-x)BiFeO3-0.3BaTiO3-x(Na0.7Sm0.1)NbO3(BF-BT-xNSN) ceramics. The introduction of complex perovskite compound NSN facilitates the transition of domains to nanodomains and improves the homogeneity of the microstructure, which results in the enhancement of the relaxation properties and breakdown electric field. Hence, the BF-BT-0.2NSN ceramic can achieve an ultrahigh energy storage density of 13.1 J/cm3 under an electric field of 650 kV/cm. Moreover, the designed BF-BT-0.2NSN ceramic achieves remarkable thermal stability (20-100 °C), frequency stability (1-100 Hz), and excellent charge/discharge performance. This study develops an idea of dielectric capacitor design and reveals the remarkable potential of BiFeO3-based dielectric ceramics within the realm of energy storage applications.

Enhanced energy storage performance of temperature-stable X8R ceramics with core-shell microstructure

Enhanced energy storage performance of temperature-stable X8R ceramics with core-shell microstructure

Enhanced energy storage properties of lead-free BNT-based ceramics by introducing Na0.7La0.1NbO3

Abstract High energy density ceramic materials play an important role in pulse systems. In this study, (1-x)(0.70Bi0.5Na0.5TiO3-0.30BiFeO3)-xNa0.7La0.1NbO3 (x = 0, 0.08, 0.16, and 0.24) (BNT-BFO-xNLN) ceramics were prepared using the traditional solid-state method. The crystal structure, microstructure, ferroelectricity, dielectric properties, energy storage density, and pulse charge-discharge performance of BNT-BFO-xNLN ceramics were systematically investigated. All BNT-BFO-xNLN ceramics exhibited a pure perovskite structure, indicating the successful incorporation of NLN into the BNT-BFO lattice. With the introduction of NLN, the P-E hysteresis loops of BNT-BFO ceramics gradually transformed from a saturated state to a slender state due to the relaxation dielectric peak shifting to room temperature. BNT-BFO-0.16NLN ceramics revealed superior energy storage properties (W rec = 4.17 J/cm3, η = 79.2%) under an electric field of 300 kV/cm. Additionally, BNT-BFO-0.16NLN ceramic exhibited a current density (C D) of 164.0 A/cm2 and a power density (P D) of 13.1 MW/cm3, making it a potential material for pulse system energy storage.

Enhanced temperature stability at DC-biased electric field in (Ba,Sr)0.82Bi0.12TiO3 lead-free energy-storage relaxor ferroelectric ceramics via superparaelectric engineering

Enhanced temperature stability at DC-biased electric field in (Ba,Sr)0.82Bi0.12TiO3 lead-free energy-storage relaxor ferroelectric ceramics via superparaelectric engineering

Enhanced Temperature Stability of Dielectric Permittivity and Energy Storage Properties of BNT-based Lead-Free Relaxor Ceramics

Enhanced Temperature Stability of Dielectric Permittivity and Energy Storage Properties of BNT-based Lead-Free Relaxor Ceramics

Large electrostrain achieved by the regulation of phase structure in Ba(Zr0.5Ti0.5)O3-Modified Bi0.5Na0.5TiO3–SrTiO3 lead-free ceramics

Large electrostrain achieved by the regulation of phase structure in Ba(Zr0.5Ti0.5)O3-Modified Bi0.5Na0.5TiO3–SrTiO3 lead-free ceramics

An effective strategy to simultaneously optimize polarization traits and breakdown strength in lead-free ceramics for high-performance energy storage applications

An effective strategy to simultaneously optimize polarization traits and breakdown strength in lead-free ceramics for high-performance energy storage applications

Enhanced electrical properties of (Bi0.5Na0.5)TiO3-modified BiFeO3-BaTiO3 lead-free ceramics

Enhanced electrical properties of (Bi0.5Na0.5)TiO3-modified BiFeO3-BaTiO3 lead-free ceramics

Outstanding comprehensive energy storage performance in BNT-based lead-free ceramics via synergistic optimization strategy

Outstanding comprehensive energy storage performance in BNT-based lead-free ceramics via synergistic optimization strategy

Origin of the enhanced piezoelectric properties in AlN-doped KNN-based lead-free ceramics

Origin of the enhanced piezoelectric properties in AlN-doped KNN-based lead-free ceramics

High-energy storage properties over a broad temperature range in La2O3-modified intermediate shell of BSZT-based lead-free ceramics

High-energy storage properties over a broad temperature range in La2O3-modified intermediate shell of BSZT-based lead-free ceramics

Participation of Polymer Materials in the Structure of Piezoelectric Composites.

This review explores the integration of polymer materials into piezoelectric composite structures, focusing on their application in sensor technologies, and wearable electronics. Piezoelectric composites combining ceramic phases like BaTiO3, KNN, or PZT with polymers such as PVDF exhibit significant potential due to their enhanced flexibility, processability, and electrical performance. The synergy between the high piezoelectric sensitivity of ceramics and the mechanical flexibility of polymers enables the development of advanced materials for biomedical devices, energy conversion, and smart infrastructure applications. This review discusses the evolution of lead-free ceramics, the challenges in improving polymer-ceramic interfaces, and innovations like 3D printing and surface functionalization, which enhance charge transfer and material durability. It also covers the effects of radiation on these materials, particularly in nuclear applications, and strategies to enhance radiation resistance. The review concludes that polymer materials play a critical role in advancing piezoelectric composite technologies by addressing environmental and functional challenges, paving the way for future innovations.