Origin of superior hardening properties in KCuTa3O9-doped K0.5Na0.5NbO3 lead-free piezoelectric ceramics

Wang, Tao; He, Lihua; Deng, Yunlong; Zheng, Qiaoji; Li, Qiang; Jiang, Na; Xu, Cheng; Cao, Xingzhong; Lin, Dunmin

doi:10.1016/j.ceramint.2017.08.126

Cited by 21 publications

(2 citation statements)

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“…A similar behavior for higher amount of the impurity phase, has been observed in other ceramics systems, such as Mn‐doped BiFeO 3 and KCuTa 3 O 9 ‐modified KNN. [32] …”

Section: Resultsmentioning

confidence: 99%

“…A similar behavior for higher amount of the impurity phase, has been observed in other ceramics systems, such as Mndoped BiFeO 3 and KCuTa 3 O 9 -modified KNN. [32] Figure 5 shows the dielectric permittivity and losses of KNN-1MN and KNN-2MN as a function of the temperature for increasing frequency from 1 kHz. The low temperature (T1) dielectric anomaly corresponds to the orthorhombic to tetragonal (O-T) polymorphic phase transition, whereas the high temperature (T2) corresponds to the phase transition to the paraelectric cubic phase (T-C).…”

Section: Resultsmentioning

confidence: 99%

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MgNb₂O₆ Modified K_0.5Na_0.5NbO₃ Eco‐Piezoceramics: Scalable Processing, Structural Distortion and Complex Impedance at Resonance

et al. 2021

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In this work, piezoceramics of the lead‐free composition K 0.5 Na 0.5 NbO 3 with an increasing amount of MgNb 2 O 6 (0, 0.5, 1, 2 wt.%) were prepared through conventional solid‐state synthesis and sintered in air atmosphere at 1100 °C. The effect of magnesium niobate addition on structure, microstructure and piezoelectric properties was evaluated. The ceramics maintain the orthorhombic Amm2 phase for all compositions, while an orthorhombic Pbcm secondary phase was found for increasing the concentration of MgNb 2 O 6 . Our results show that densification of these ceramics can be significantly improved up to 94.9 % of theoretical density by adding a small amount of magnesium‐based oxide (1 wt.%). Scanning electron microscopy morphology of the 1 wt.% system reveals a well‐packed structure with homogeneous grain size of ∼2.72 μm. Dielectric and piezoelectric properties become optimal for 0.5–1.0 wt.% of MgNb 2 O 6 that shows, with respect to the unmodified composition, either higher piezoelectric coefficients, lower anisotropy and relatively low piezoelectric losses (d 33 =97 pC N −1 ; d 31 =−36.99 pC N −1 and g 31 =−14.04×10 −3 mV N −1 ; Q p (d 31 )=76 and Q p (g 31 )=69) or enhanced electromechanical coupling factors (k p =29.06 % and k 31 =17.25 %).

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“…A similar behavior for higher amount of the impurity phase, has been observed in other ceramics systems, such as Mn‐doped BiFeO 3 and KCuTa 3 O 9 ‐modified KNN. [32] …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

MgNb₂O₆ Modified K_0.5Na_0.5NbO₃ Eco‐Piezoceramics: Scalable Processing, Structural Distortion and Complex Impedance at Resonance

et al. 2021

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Enhanced Temperature Stability and Defect Mechanism of BNT‐Based Lead‐Free Piezoceramics Investigated by a Quenching Process

Liu

Thong

et al. 2018

Adv Elect Materials

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Because of the environmental concerns of eliminating lead from piezoelectric products, bismuth‐based perovskite is becoming one of the most potential candidates. However, its relatively low thermal depolarization temperature (Td) is still an imperative obstacle hindering implementation of this material for practical application. Here, an enhanced temperature stability of 0.94(Bi0.5Na0.5)TiO3‐0.06BaTiO3 (BNTBT6) piezoceramics is reported, which can be obtained by the effective quenching process. Quenching process enhances the depolarization temperature to 136 °C, which is 40 °C higher than that of normal sintered samples. By using X‐ray photoelectron spectroscopy and electron paramagnetic resonance methods, it is revealed that oxygen vacancy may exist in the quenched samples and consequently pins the domain walls, resulting in significant enhancement of depolarization temperature. Temperature‐dependent dielectric, piezoelectric, and ferroelectric behaviors are measured as criteria to evidence the enhanced temperature stability.

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Defect-relevant piezoelectric and ferroelectric properties in LiCuTa3O9-doped K0.5Na0.5NbO3 lead-free piezoceramics

Wang

Liao

Peng

et al. 2018

J Mater Sci: Mater Electron

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Origin of superior hardening properties in KCuTa3O9-doped K0.5Na0.5NbO3 lead-free piezoelectric ceramics

Cited by 21 publications

References 80 publications

MgNb₂O₆ Modified K_0.5Na_0.5NbO₃ Eco‐Piezoceramics: Scalable Processing, Structural Distortion and Complex Impedance at Resonance

MgNb₂O₆ Modified K_0.5Na_0.5NbO₃ Eco‐Piezoceramics: Scalable Processing, Structural Distortion and Complex Impedance at Resonance

Enhanced Temperature Stability and Defect Mechanism of BNT‐Based Lead‐Free Piezoceramics Investigated by a Quenching Process

Defect-relevant piezoelectric and ferroelectric properties in LiCuTa3O9-doped K0.5Na0.5NbO3 lead-free piezoceramics

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Origin of superior hardening properties in KCuTa3O9-doped K0.5Na0.5NbO3 lead-free piezoelectric ceramics

Cited by 21 publications

References 80 publications

MgNb2O6 Modified K0.5Na0.5NbO3 Eco‐Piezoceramics: Scalable Processing, Structural Distortion and Complex Impedance at Resonance

MgNb2O6 Modified K0.5Na0.5NbO3 Eco‐Piezoceramics: Scalable Processing, Structural Distortion and Complex Impedance at Resonance

Enhanced Temperature Stability and Defect Mechanism of BNT‐Based Lead‐Free Piezoceramics Investigated by a Quenching Process

Defect-relevant piezoelectric and ferroelectric properties in LiCuTa3O9-doped K0.5Na0.5NbO3 lead-free piezoceramics

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MgNb₂O₆ Modified K_0.5Na_0.5NbO₃ Eco‐Piezoceramics: Scalable Processing, Structural Distortion and Complex Impedance at Resonance

MgNb₂O₆ Modified K_0.5Na_0.5NbO₃ Eco‐Piezoceramics: Scalable Processing, Structural Distortion and Complex Impedance at Resonance