Composition dependence of phase structure and electrical properties in (0.98-x)K0.35Na0.65NbO3–0.02BaZrO3–xBi0.5Na0.5ZrO3 ternary ceramics

Tang, Xi; Chen, Tao; Liu, Yuhong; Zhang, Jianwei; Zhang, Ting; Wang, Guangchang; Zhou, Jifang

doi:10.1016/j.jallcom.2016.02.140

Cited by 21 publications

(5 citation statements)

References 29 publications

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“…The calculated value of γ is 1.62, further demonstrating a strong relaxor ferroelectric behavior for KNN/BMO solid‐solution films. That is to say, different from previous reports on the pure KNN materials, normal ferroelectric behavior transform to relaxor ferroelectrics for the solid‐solution films, which is due to the structural changes caused by the addition of BMO . Because of the difference in size and charge between A and B site ions in KNN/BMO solid‐solution films, the long‐range dipole interaction is destroyed, which leads to the formation of polar nano‐regions.…”

contrasting

confidence: 62%

High Energy Storage Efficiency with Fatigue Resistance and Thermal Stability in Lead‐Free Na_0.5K_0.5NbO₃/BiMnO₃ Solid‐Solution Films

Sun

Zhou

et al. 2017

Physica Rapid Research Ltrs

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The ferroelectric, leakage, dielectric, and energy storage properties of leadfree Na 0.5 K 0.5 NbO 3 /BiMnO 3 (KNN/BMO) solid-solution films are investigated. The strong ferroelectric relaxation behaviors of slim ferroelectricity with small remanent polarization and coercive field induce a high energystorage density and efficiency at room temperature. The energy density reaches 14.8 J cm À3 , even the efficiency is up to 79.79% under the applied electric field of 985.66 kV cm À1 . Moreover, the energy storage performances of KNN/BMO solid-solution films exhibit good thermal stability over a wide temperature range and high ferroelectric fatigue endurance after switching 10 6 bipole electrical cycles. KNN/BMO solid-solution films can replace leadbased films and other outstanding lead-free systems in the energy storage performance.As a key component of pulse power equipment, pulsed capacitors need to withstand a high discharge current in a short period of time and thousands of charge and discharge lifetimes. [1,2] Therefore, capacitor storage has become the focus of research because of its highest power, efficiency, few limited conditions, and simple structure. With the development of new pulse system toward high energy, miniaturization, the most effective way to improve the efficiency of pulsed system is adopted to improve the performances of capacitor materials. The typical dielectric materials including linear dielectric materials, ferroelectric materials, antiferroelectric materials, and relaxor ferroelectrics can meet the requirements for such materials. [3,4] Classically, energy storage density of dielectric capacitors is calculated according to the following formula [3] :where E and P are applied electric field and the corresponding polarization during charge process. During discharge process, applied electric field is gradually withdrawn from the maximum to zero, and recoverable energy storage density (W rec ) is released, which obeys the following equation:The loss energy density (W loss ¼ W -W rec ) is caused by hysteresis loss. Therefore, the energy storage efficiency (η) can be calculated by the equationAs discussed above, large polarization changes (i.e., slim hysteresis loops) and high breakdown electric fields are required to obtain high W rec . Thus, relaxor ferroelectrics (REF) are considered as promising materials for energy storage devices, due to their high saturation polarization (P s ), low remanent polarization (P r ), and ultrahigh storage efficiency η.Compared with bulk materials, films endow lower size, higher breakdown electrical field, and energy storage efficiency, which can be applied to microelectronic devices.Recently, more and more researchers have paid attention to Na 0.5 K 0.5 NbO 3 (KNN) lead-free ferroelectrics as substitutes for lead-based materials in energy storage due to environmental friendliness. Up to now, a great deal of research has focused on the energy storage of KNN-based ceramics. [5][6][7] However, little attention has been paid to the energy storage performances of...

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confidence: 62%

High Energy Storage Efficiency with Fatigue Resistance and Thermal Stability in Lead‐Free Na_0.5K_0.5NbO₃/BiMnO₃ Solid‐Solution Films

Sun

Zhou

et al. 2017

Physica Rapid Research Ltrs

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“…Therefore, the ceramics with x = 0.03 should possess a mixed phase boundary comprising R-O and O-T phase boundaries. [12] This phenomenon further extended to the ceramics with x = 0.04 that exhibited the similar XRD patterns to that of the ceramics with x = 0.03 ( Figure 1a). More importantly, due to the further reduction of T O-T and suppressed T R-O , both of them merged near the room temperature, resulting in a board T R-O&O-T of 25 ± 25 °C in the ceramics with x = 0.04 ( Figure 1b).…”

Section: Wwwadvelectronicmatdesupporting

confidence: 58%

Modifying Temperature Stability of (K,Na)NbO₃ Ceramics through Phase Boundary

Xiao

et al. 2018

Adv Elect Materials

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Particularly, unipolar strain and its temperature stability comparable to those of soft PZT-4 ceramics were reported in textured (K 0.44 Na 0.52 Li 0.04 )(Nb 0.84 Ta 0.10 Sb 0.06 )O 3 (LF4T) ceramics synthesized by the reactive template grain growth (RTGG) method. [6] Subsequent investigations focused on the improvement of both unipolar strain and its temperature stability using conventional sintering method due to high cost of RTGG. Vast studies strongly proved that phase boundary is an effective way to improve strain properties of KNN-based ceramics. [1] Particularly, the construction of new phase boundary by simultaneously shifting the rhombohedral-orthorhombic and orthorhombic-tetragonal phase transition temperature (e.g., T R-O and T O-T ) toward room temperature proved to enhance the piezoelectric properties of KNN-based ceramics. [1,7] Although the improved piezoelectricity can be guaranteed by means of phase boundaries, the related electrical properties still exhibited the strong temperature dependence due to the nature of polymorphic phase boundary that is different from the morphotropic phase boundary in PZT-based ceramics. [1,2,4,5] More importantly, the systematical investigations on how the phase boundaries affected the strain and its temperature stability is still missing, which could further promote the understanding of KNNbased ceramics.Recently, the temperature-insensitive dielectric properties were reported in SrZrO 3 -modified KNN-based ceramics, accompanying with small permittivity variation of ±15% (−65 to 201 °C). [8] Here, (0.99-x)(K 0.5 Na 0.5 )(Nb 0.965 Sb 0.035 )O 3 -0.01SrZrO 3 -x(Bi 0.5 Na 0.5 )ZrO 3 (x = 0-0.05) ceramics were chosen as an example to illustrate the effects of phase boundaries on the strain and its temperature stability. Through the study of temperature-dependent unipolar strain at different phase boundaries and similar phase boundary with different locations, effects of phase boundaries on strain and its temperature stability were illustrated. More importantly, the improved temperature stability of unipolar strain (S uni ) was observed in the ceramics (x = 0.03), e.g., high retention (≈95%) of S uni at T = 180 °C and low variation of 24% at T = 20-180 °C. The related physical mechanisms were discussed in detail. Results and DiscussionA typical perovskite structure without any other secondary phases was found in all samples ( Figure S1, Supporting Information).

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“…1(c). For an increasing tolerance factor t due to doping with larger A-site ions, Fig 1(d) [7,17], or a 3-phase PPT region near the convergent (composition) point of two phase boundaries [5,18], leading to greatly enhanced electromechanical properties. However, the major drawback of a discrete PPT or MPB region, whether it is a two-phase region or a three-phase one, is the lack of compositional stability of the enhanced properties.…”

Section: This Type Of Phase Transition Behavior Takes Place In Some Dmentioning

confidence: 99%

“…Electromechanical performance of ferroelectric ceramics has a close relationship with their phase structures [1][2][3][4][5][6][7][8]. The high d 33 piezoelecteic coefficients in PZT ceramics are results of the effect of a morphotropic phase boundary(MPB) created by a proper Zr/Ti atomic ratio [9,10].…”

Section: Introduction：mentioning

confidence: 99%

Creating adjoining polymorphic phase transition (PPT) regions in ferroelectric (Ba,Sr)(Zr,Ti)O3 ceramics

Cheng

Liu

et al. 2017

Journal of the European Ceramic Society

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In this work, we report the polymorphic phase transitions(PPT) in ferroelectric Ba 0.95 Sr 0.05 Zr x Ti (1-x) O 3 (BSZT, x=0.01~0.10) ceramics synthesized by using a solid-state reaction method. The doping elements and composition ratios were selected to create adjoining PPT phase boundaries near room temperature, hence to achieve a broadened peak of piezoelectric performance with respect to composition. The temperature-composition phase diagram was constructed and the effects of PPT on the electromechanical and ferroelectric properties of the ceramics were investigated. It was revealed that the two adjacent PPT regions at room temperature showed different characteristics in property enhancement. However, due to the proximity of the phase boundaries, Ba 0.95 Sr 0.05 Zr x Ti (1-x) O 3 ceramics in a fairly broad range of compositions (0.02≤x≤0.07) showed excellent piezoelectric properties, 1 Certain commercial equipment, instruments, or materials are identified in this paper to adequately specify the experimental procedure. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the materials or equipment identified are necessarily the best available for the purpose.

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Composition dependence of phase structure and electrical properties in (0.98-x)K0.35Na0.65NbO3–0.02BaZrO3–xBi0.5Na0.5ZrO3 ternary ceramics

Cited by 21 publications

References 29 publications

High Energy Storage Efficiency with Fatigue Resistance and Thermal Stability in Lead‐Free Na_0.5K_0.5NbO₃/BiMnO₃ Solid‐Solution Films

High Energy Storage Efficiency with Fatigue Resistance and Thermal Stability in Lead‐Free Na_0.5K_0.5NbO₃/BiMnO₃ Solid‐Solution Films

Modifying Temperature Stability of (K,Na)NbO₃ Ceramics through Phase Boundary

Creating adjoining polymorphic phase transition (PPT) regions in ferroelectric (Ba,Sr)(Zr,Ti)O3 ceramics

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Composition dependence of phase structure and electrical properties in (0.98-x)K0.35Na0.65NbO3–0.02BaZrO3–xBi0.5Na0.5ZrO3 ternary ceramics

Cited by 21 publications

References 29 publications

High Energy Storage Efficiency with Fatigue Resistance and Thermal Stability in Lead‐Free Na0.5K0.5NbO3/BiMnO3 Solid‐Solution Films

High Energy Storage Efficiency with Fatigue Resistance and Thermal Stability in Lead‐Free Na0.5K0.5NbO3/BiMnO3 Solid‐Solution Films

Modifying Temperature Stability of (K,Na)NbO3 Ceramics through Phase Boundary

Creating adjoining polymorphic phase transition (PPT) regions in ferroelectric (Ba,Sr)(Zr,Ti)O3 ceramics

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High Energy Storage Efficiency with Fatigue Resistance and Thermal Stability in Lead‐Free Na_0.5K_0.5NbO₃/BiMnO₃ Solid‐Solution Films

High Energy Storage Efficiency with Fatigue Resistance and Thermal Stability in Lead‐Free Na_0.5K_0.5NbO₃/BiMnO₃ Solid‐Solution Films

Modifying Temperature Stability of (K,Na)NbO₃ Ceramics through Phase Boundary