Relaxor transition and properties of Mn-doped SrxBa1−xNb2O6 ferroelectric ceramics

Zhao, Yingying; Wang, Jiping; Zhang, Lixue; Shi, Xiujing; Liu, Shujuan; Zhang, Dawei

doi:10.1016/j.ceramint.2016.07.120

Cited by 24 publications

(12 citation statements)

References 26 publications

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“…In agreement with the study of Yao et al [24], dielectric peak position does not shift significantly towards higher temperatures with increasing frequency, pointing to a normal ferroelectric with diffuse phase transition character rather than a ferroelectric relaxor. This is in contrast to what has been reported for Sr 0.6 Ba 0.4 Nb 2 O 6 ceramics, where a clear shift in the broad dielectric maximum to higher temperatures is reported [32,33]. The maximum value of our dielectric constant is smaller than that reported in Ref.…”

Section: Dielectric Propertiescontrasting

confidence: 99%

Electrocaloric effect of alkali co-substituted Sr0.6Ba0.4Nb2O6 ceramics

Kurnia

Emriadi

Mufti

et al. 2020

Journal of Alloys and Compounds

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We have investigated the electrocaloric properties of K + and Na + co-substituted Sr 0.6 Ba 0.4 Nb 2 O 6 (SBN) ceramics using the indirect method. Tetragonal tungsten bronze (K 0.5 Na 0.5 ) 2x (Sr 0.6 Ba 0.4 ) 5-x Nb 10 O 30 (KNSBN) with x = 0.24 was synthesized using dual-step sintering. Despite the low amount, K + and Na + co-substitution resulted in normal ferroelectric behaviour, showing no significant shift in the dielectric maximum temperature of 111°C with increasing frequency. Maximum electrocaloric temperature change (ΔT) of 0.3 K was observed at an electric field of 30 kV/cm (ΔE) yielding the largest electrocaloric responsivity (ΔT/ΔE) among SBN based ceramics. This relatively large value is in agreement with the larger pyroelectric coefficient of KNSBN compared to SBN based ceramics.

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Section: Dielectric Propertiescontrasting

confidence: 99%

Electrocaloric effect of alkali co-substituted Sr0.6Ba0.4Nb2O6 ceramics

Kurnia

Emriadi

Mufti

et al. 2020

Journal of Alloys and Compounds

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“…As a result, W rec increases to 5.895 J cm −3 with an enhancement of 50.69%, and 𝜂 is also improved to 85.37%. The achievement of optimized composition of Sr 0.425 La 0.1 □ 0.05 Ba 0.425 Nb 1.4 Ta 0.6 O 6 can also be supported by a systematical investigation on the [17,18,[22][23][24][27][28][29][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53] structure and properties of Sr 0.425 La 0.1 □ 0.05 Ba 0.425 Nb 2−x Ta x O 6 ceramics with different Ta 5+ concentrations, which is summarized in Figures S1-S4 (Supporting Information). A comparison of the ESP of our SLBNT ceramics and previously reported lead-free bulk ceramics are illustrated in Figure 2e.…”

Section: Figure 2amentioning

confidence: 86%

Superior Energy Density Achieved in Unfilled Tungsten Bronze Ferroelectrics via Multiscale Regulation Strategy

Peng

Liu

et al. 2023

Advanced Science

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The most promising candidates for energy storage capacitor application are relaxor ferroelectrics, among which, the perovskite structure ferroelectric ceramics have witnessed great development progress. However, less attention has been paid on tetragonal tungsten bronze structure (TTBS) ceramics because of their lower breakdown strength and polarization. Herein, a multiscale regulation strategy is proposed to tune the energy storage performances (ESP) of TTBS ceramics from grain, domain, and macroscopic scale. The enhanced relaxor behavior with dynamic polar nanodomains guarantees low remanent polarization, while the refined grains and enlarged bandgap ensure increased breakdown strength. Hence, excellent ESP is realized in unfilled TTBS Sr0.425La0.1□0.05Ba0.425Nb1.4Ta0.6O6 (SLBNT) ceramics with an ultrahigh recoverable energy density of 5.895 J cm−3 and a high efficiency of 85.37%. This achievement notably surpasses previous studies in TTBS ceramics and is comparable to that of perovskite components. Meanwhile, the energy density exhibits a wide temperature, frequency, and cycling fatigue stability. In addition, high power density (257.89 MW cm−3), especially the ultrafast discharge time (t0.9 = 16.4 ns) are achieved. The multiscale regulation strategy unlocks the energy storage potential of TTBS ceramics and thus highlights TTBS ceramics as promising candidates for energy storage, like perovskite structured ceramics.

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“…The samples are denoted as CS sample and SPS sample, respectively. The CS process was reported in a previous article [10] and the SBN60-2La samples in this work were sintered at 1350 • C for 4 h. For the SPS sample, the SBN60-2La powders were presintered by CS and then put into a graphite die with a diameter of 10 mm. In order to avoid contact between the powder and the die, a graphite foil was used in the SPS sintering process.…”

Section: Methodsmentioning

confidence: 99%

“…Sr ions occupy both the A1 site and the larger A2 site, whereas the larger Ba ions occupy the A2 site only. The smaller C site remains empty [10,11]. Moreover, SBN ceramics transition from normal ferroelectrics to relaxor ferroelectrics when the Sr/Ba increases [10].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Energy Storage Properties of La-Doped Sr0.6Ba0.4Nb2O6 Relaxor Ferroelectric Ceramics Prepared by Spark Plasma Sintering

et al. 2022

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In this work, La-doped Sr0.6Ba0.4Nb2O6 ferroelectric ceramics were fabricated by the conventional solid state reaction method (CS) and spark plasma sintering (SPS), respectively. The microstructure, phase structure, dielectric properties, relaxor behavior, ferroelectric and energy storage properties were investigated and compared to indicate the effects of spark plasma sintering on their performances. The results show that the grain shape changes from columnar to isometric crystal and the grain size decreases obviously after spark plasma sintering. The dielectric constant of the CS sample and the SPS sample both show a typical relaxor behavior with obvious frequency dispersion. The diffusion parameters (γ) of both CS sample and SPS sample are close to 2 and all the samples present slim polarization–electric (P-E) loops, which verify the relaxor behavior. Moreover, the breakdown strength, Eb, and discharge energy storage density, Wrec, of La-doped Sr0.6Ba0.4Nb2O6 ferroelectric ceramics prepared by SPS are improved significantly. This work provides guidance for improving the energy storage performance of ferroelectric ceramics with tungsten bronze structures by decreasing the grain size through adopting a different sintering method.

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Relaxor transition and properties of Mn-doped SrxBa1−xNb2O6 ferroelectric ceramics

Cited by 24 publications

References 26 publications

Electrocaloric effect of alkali co-substituted Sr0.6Ba0.4Nb2O6 ceramics

Electrocaloric effect of alkali co-substituted Sr0.6Ba0.4Nb2O6 ceramics

Superior Energy Density Achieved in Unfilled Tungsten Bronze Ferroelectrics via Multiscale Regulation Strategy

Enhanced Energy Storage Properties of La-Doped Sr0.6Ba0.4Nb2O6 Relaxor Ferroelectric Ceramics Prepared by Spark Plasma Sintering

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