Enhanced piezoelectric, electrocaloric and energy storage properties at high temperature in lead-free Bi0.5(Na1-xKx)0.5TiO3 ceramics

Wang, Xiangjian; Gao, Hongcheng; Hao, Xihong; Lou, Xiaojie

doi:10.1016/j.ceramint.2018.11.100

Cited by 40 publications

(20 citation statements)

References 60 publications

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“…Modification of this composition by 0.5 wt% of La [22] facilitated improved ∆T (∆T = −2.6 • C at 50 kV/cm, 65 • C). A similar value in the same temperature range was obtained in 0.9NBT-0.1K1/2Bi1/2TiO3 [23]. ECE in NBT, doped with various lanthanides, is surprisingly sensitive to the choice of doping element [24], in particular for doping with 2 mol% Gd-reaching ∆T = 1.8 • C (90 kV/cm, 150 • C).…”

Section: Introductionsupporting

confidence: 78%

Electrocaloric Effect in (1−x)(0.8Na0.5Bi0.5TiO3-0.2BaTiO3)−xCaTiO3 Solid Solutions at High Electric Fields

et al. 2022

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Recently, promising results were obtained in studies of the electrocaloric effect in thin films. Therefore, research into this effect at high applied electric field values in bulk ferroelectrics is an important task for those scoping out materials that could be appropriate for cooling devices based on the electrocaloric effect. The present study addresses electrocaloric effect in (1−x)(0.8Na1/2Bi1/2TiO3-0.2BaTiO3)−xCaTiO3 solid solutions by the direct method in electric fields ranging from 0 up to 100 kV/cm and at temperatures of up to 150 °C. The choice of 0.8Na1/2Bi1/2TiO3-0.2BaTiO3 as the starting composition is motivated by high spontaneous polarization within the studied range of electric fields, while CaTiO3 is added to reduce depolarization temperature at, and below, room temperature. In the studied temperature range, the maximal value of electrocaloric effect with temperature change of ΔT = 1.0 °C was found in the composition with x = 0.050 at 100 °C, having significant contribution from the entropy jump at the first-order phase transition induced by an electric field. At increasing CaTiO3 concentration, the attainable ΔT decreases. Measurements of polarization current, which were taken simultaneously with ΔT measurements, allowed us to study differences between ΔT obtained by the direct and the indirect methods.

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Section: Introductionsupporting

confidence: 78%

Electrocaloric Effect in (1−x)(0.8Na0.5Bi0.5TiO3-0.2BaTiO3)−xCaTiO3 Solid Solutions at High Electric Fields

et al. 2022

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“…The porous effect can be an easy way for increasing the current conduction and dielectric loss and as consequently increase the coercive eld [17]. On the other hand it is worth to noting that the shape of grain boundary is completely changed from normal ferroelectric with cubic shape of grain of BKNT at Dielectric loss dependence temperature and frequency as well was studied for all compositions where all the present samples shown low value of dielectric loss compare to pure BNT at room temperature [19] which indicates that the BKNT-ST-BCT ceramics are a promising candidate for energy storage applications.…”

Section: Resultsmentioning

confidence: 99%

Intrinsic and extrinsic contributions in non-linearity dielectric response of (Bi0.5Na0.3K0.2)TiO3-(Ba0.8Ca0.2)TiO3 based SrTiO3 ceramics driven by Rayleigh model

Mahmoud

Babeer

2021

Preprint

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Pb-free ceramics of [(0.95-x)(Bi0.5Na0.3K0.2)TiO3-0.05(Ba0.8Ca0.2)TiO3 doped x(SrTiO3) (0.0 ≤ x ≤ 0.2) were prepared by solid solution technique. The effect of ST content on the crystal structure and morphology of the sintered ceramics were systemically investigated. Crossover phase transition from ferroelectric to relaxor accompanied by changes in the shape of grain morphology were observed by increasing ST-content. The phase crossover is caused by oxygen vacancies and 1attice distortion effect. The electrical properties for virgin and poled samples were investigated. All virgin samples belong (x ≤ 0.15) showed present ferroelectric to relaxor diffused phase transition however ST = 0.2, only relaxor to paraelectric phase transition was detected in whole range of temperature. The poled sample of ST = 0.2 showed present two phase transition similar to (ST ≤ 0.15) denote domain grow caused by domain wall displacement at high amplitude of electric field. The polarization response was studied under sub-switching cyclic of electric fie1ds at different temperatures. The non-linearity behavior showed both of ferroe1ectric and relaxor phase dominated by Rayleigh-type dynamic. The results suggest that in ferroelectric phase, the extrinsic contribution caused by domain wall motion is responsible for majority of dielectric contributions while in relaxor phase, the majority of dielectric contribution are comes from intrinsic contribution caused by lattice distortion effect. Corresponding author: abdelrazek.mahmoud@sci.svu.edu.eg

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“…The optimized maximum electrocaloric coefficient ∆T/∆E reaches to 0.28 Kmm/kV. The ECE result of the component x = 0.4 is better than some other BNT-based systems, such as BNT-BT and BNT-BKT [14,35]. In view of the low driving electric field of 5 kV/mm, enhanced ECE should be expected under higher loading.…”

Section: J T P Dt Dtmentioning

confidence: 92%

“…Under a driving electric field of 7 kV/mm, Zhang et al studied a small amount of LiNbO 3 modified 0.88(Na 1/2 Bi 1/2 )TiO 3 -0.12BaTiO 3 ceramics and obtained an improved ∆T = 1.71 K of ECE [13]. Wang et al incorporated (Bi 0.5 K 0.5 )TiO 3 (BKT) into BNT ceramics to prepare an optimized component achieving ∆T = 1.08 K of ECE [14]. There is an obvious reduction of phase transition temperature in their experiments, implying the FE-ER transition is a considerable direction for the purpose of acquiring high ECE.…”

Section: Introductionmentioning

confidence: 99%

Improved Non-Piezoelectric Electric Properties Based on La Modulated Ferroelectric-Ergodic Relaxor Transition in (Bi0.5Na0.5)TiO3-Ba(Ti, Zr)O3 Ceramics

Zhang

Xiao

et al. 2021

Materials

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The characteristic transition from ferroelectric (FE) to ergodic relaxor (ER) state in (Bi0.5Na0.5)TiO3 (BNT) based lead-free ceramics provides an efficient approach to bring a highly ordered phase back to a disordered one. It would be rational to utilize this transition to improve relevant non-piezoelectric properties based on domain decomposition. In this work, different La contents were introduced to 0.93(Bi0.5Na0.5)TiO3-0.07Ba(Ti0.945Zr0.055)O3 ceramics (BNT-BZT-xLa) to induce evolution of ergodic degree. The results reveal that with increasing La content, both the FE-ER transition temperature TF-R and depolarization temperature Td shift towards room temperature, implying a deepened ergodic degree. By modulation of ergodic degree, thermally stimulated depolarization current experiment shows a higher current density peak, and corresponding pyroelectric coefficient increases from 2.46 to 2.81 μC/(cm2∙°C) at Td. For refrigeration, the indirect measurement demonstrates the ΔT maximum increases from 1.1 K to 1.4 K, indicating an enhanced electrocaloric effect. Moreover, the optimized energy storage effect is observed after La doping. With appearance of “slimmer” P-E loops, both calculated recoverable energy storage density Wrec and storage efficiency η increase to 0.23 J/cm3 and 22.8%, respectively. These results denote La doping conduces to the improvement of non-piezoelectric properties of BNT-based ceramics in a certain range. Therefore, La doping should be an adopted modification strategy for lead-free ceramics used in areas like refrigerator and pulse capacitors.

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Enhanced piezoelectric, electrocaloric and energy storage properties at high temperature in lead-free Bi0.5(Na1-xKx)0.5TiO3 ceramics

Abstract: Enhanced piezoelectric, electrocaloric and energy storage properties at high temperature in lead-free Bi 0.5 (Na 1-x K x) 0.5 TiO 3 ceramics, Ceramics International,

Cited by 40 publications

References 60 publications

Electrocaloric Effect in (1−x)(0.8Na0.5Bi0.5TiO3-0.2BaTiO3)−xCaTiO3 Solid Solutions at High Electric Fields

Electrocaloric Effect in (1−x)(0.8Na0.5Bi0.5TiO3-0.2BaTiO3)−xCaTiO3 Solid Solutions at High Electric Fields

Intrinsic and extrinsic contributions in non-linearity dielectric response of (Bi0.5Na0.3K0.2)TiO3-(Ba0.8Ca0.2)TiO3 based SrTiO3 ceramics driven by Rayleigh model

Improved Non-Piezoelectric Electric Properties Based on La Modulated Ferroelectric-Ergodic Relaxor Transition in (Bi0.5Na0.5)TiO3-Ba(Ti, Zr)O3 Ceramics

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