Lead-Free KNbO<sub>3</sub>:<i>x</i>ZnO Composite Ceramics

Lv, Xiang; Li, Zhuoyun; Wu, Jiagang; Xiao, Dingquan; Zhu, Jianguo

doi:10.1021/acsami.6b11677

Cited by 35 publications

(13 citation statements)

References 34 publications

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“…Similar fluctuations can also be observed in other lead-free textured and composite ceramics. [39,47] On the one hand, grains and grain boundaries have different energy and tension, generating apparent fluctuations at grain boundary (see Figure 1f). On the other hand, the textured ceramics are subjected to high temperature for prolonged time, thus leading to the inevitable volatilization of Na, Bi, and O elements.…”

Section: Resultsmentioning

confidence: 99%

Giant Field‐Induced Strain with Low Hysteresis and Boosted Energy Storage Performance under Low Electric Field in (Bi_0.5Na_0.5)TiO₃‐Based Grain Orientation‐Controlled Ceramics

Bai

Zhao

Ding

et al. 2020

Adv Elect Materials

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Lead‐free dielectrics with both excellent strain behavior and superior energy‐storage feature are crucial toward providing desired performance for smart electrical devices, especially under harsh environmental conditions. Herein, it is demonstrated that giant strain response of ≈0.51% with small hysteresis of ≈29% and large recoverable energy density (≈1.6 J cm−3) under low electric field (120 kV cm−1), together with excellent stabilities against temperature, frequency, and cycling, can be simultaneously achieved in oriented (with 79.4% 〈00l〉 texture) (Bi0.5Na0.5)TiO3–BaTiO3–NaNbO3 (BNT–BT–NN) ceramics through integrating crystallographic texturing and domain engineering. Besides, a fast discharge rate of <0.1 µs along with good thermal endurance in a wide temperature range can also be acquired. It is uncovered by piezoelectric force microscopy measurements that the formation of oriented microstructure greatly promotes the domain switching and mobility, producing the considerably easy ergodic relaxor to ferroelectric phase transition with concurrently improved strain and energy storage properties in grain orientation controlled BNT–BT–NN ceramics. This study offers a feasible and propagable guidance, i.e., crystallographic texturing and domain engineering, to develop new lead‐free dielectrics for both actuators and capacitors.

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Section: Resultsmentioning

confidence: 99%

Giant Field‐Induced Strain with Low Hysteresis and Boosted Energy Storage Performance under Low Electric Field in (Bi_0.5Na_0.5)TiO₃‐Based Grain Orientation‐Controlled Ceramics

Bai

Zhao

Ding

et al. 2020

Adv Elect Materials

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“… 32 , 33 Similarly, incorporation of small amounts of additives like LaFeO 3 , BiFeO 3 , MnO 2 , and ZnO results in improved density and electrical properties of KNbO 3 . 34 − 37 …”

Section: Introductionmentioning

confidence: 99%

Development of Cuboidal KNbO₃@α-Fe₂O₃ Hybrid Nanostructures for Improved Photocatalytic and Photoelectrocatalytic Applications

et al. 2020

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Monophasic and hybrid nanostructures of KNbO 3 and α-Fe 2 O 3 have been prepared using a hydrothermal process for photoelectrocatalytic and photocatalytic applications. Powder X-ray diffraction studies showed the formation of KNbO 3 , α-Fe 2 O 3 , and KNbO 3 /α-Fe 2 O 3 with average grain sizes of 18.3, 11.5, and 26.1 nm and Brunauer–Emmett–Teller (BET) specific surface areas of 4, 100, and 20 m 2 /gm, respectively. Under simulated solar irradiation, the as-prepared heterostructure shows enhanced photoelectrocatalytic oxygen evolution reaction (OER) activity compared to pristine KNbO 3 and α-Fe 2 O 3 . Significant photocatalytic activity of as-synthesized KNbO 3 /α-Fe 2 O 3 heterostructure photocatalyst was obtained for removal of methylene blue organic dye under visible light, and the percentage activity was found to be 11, 49, and 89% for KNbO 3 , α-Fe 2 O 3 , and KNbO 3 /α-Fe 2 O 3 photocatalysts, respectively. The dielectric constant was found to be 250.2, 65.2, and 251.5 for KNbO 3 , α-Fe 2 O 3 , and KNbO 3 /α-Fe 2 O 3 heterostructure, respectively, at 50 °C and 500 kHz frequency.

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“…ZnO-Bi2O3-based ceramics have been significantly applied to electrical power systems and microelectronics due to their excellent non-ohmic characteristic [1][2][3][4][5][6]. In general, the conventional sintering (CS) for the preparation of ZnO-Bi2O3-based ceramic always requires a higher furnace temperature of 1200 ℃ and a longer sintering time of >2 h, which suffered from some disadvantages, such as time, cost and energy waste [7].…”

Section: Introductionmentioning

confidence: 99%

Flash Assisted Synthesis and Electrical Performance of MnO2-doped ZnO-Bi2O3-based Ceramics

Peng

Chen

Niu

et al. 2020

Preprint

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How to prepare high-performance ZnO-based varistor ceramics in a short time and at a low temperature remains a key challenge. Flash sintering method provides an effective approach to solve this challenge. Here, MnO2-doped ZnO-Bi2O3-based dense varistor composite ceramics were successfully prepared by the flash sintering method at the furnace temperature < 750 ℃ in 60 s under the DC electric field of 300 V⋅cm− 1. The effects of MnO2 on the onset of furnace temperature, specimen temperature, and specimen conductivity were systematically investigated in the flash sintering process. The results of flash sintering show that the onset of furnace temperature of ZnO-Bi2O3-based composite ceramic containing 0.5 mol% MnO2 is only 704 ℃, which is significantly lower than that of undoped ZnO-Bi2O3-based varistor ceramic. The measurement results of the electrical properties for all flash-sintered composite varistors ceramics show that the composite sample containing 0.5 mol% MnO2 has the best electrical performance parameters compared with the undoped ZnO-Bi2O3-based varistor ceramic. The flash-sintered ceramic containing 0.5 mol% MnO2 obtained the nonlinear coefficient of 18, the leakage current of 16.82 µA, and the dielectric constant of 1221 at 1 kHz.

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Lead-Free KNbO₃:xZnO Composite Ceramics

Cited by 35 publications

References 34 publications

Giant Field‐Induced Strain with Low Hysteresis and Boosted Energy Storage Performance under Low Electric Field in (Bi_0.5Na_0.5)TiO₃‐Based Grain Orientation‐Controlled Ceramics

Giant Field‐Induced Strain with Low Hysteresis and Boosted Energy Storage Performance under Low Electric Field in (Bi_0.5Na_0.5)TiO₃‐Based Grain Orientation‐Controlled Ceramics

Development of Cuboidal KNbO₃@α-Fe₂O₃ Hybrid Nanostructures for Improved Photocatalytic and Photoelectrocatalytic Applications

Flash Assisted Synthesis and Electrical Performance of MnO2-doped ZnO-Bi2O3-based Ceramics

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Lead-Free KNbO3:xZnO Composite Ceramics

Cited by 35 publications

References 34 publications

Giant Field‐Induced Strain with Low Hysteresis and Boosted Energy Storage Performance under Low Electric Field in (Bi0.5Na0.5)TiO3‐Based Grain Orientation‐Controlled Ceramics

Giant Field‐Induced Strain with Low Hysteresis and Boosted Energy Storage Performance under Low Electric Field in (Bi0.5Na0.5)TiO3‐Based Grain Orientation‐Controlled Ceramics

Development of Cuboidal KNbO3@α-Fe2O3 Hybrid Nanostructures for Improved Photocatalytic and Photoelectrocatalytic Applications

Flash Assisted Synthesis and Electrical Performance of MnO2-doped ZnO-Bi2O3-based Ceramics

Contact Info

Product

Resources

About

Lead-Free KNbO₃:xZnO Composite Ceramics

Giant Field‐Induced Strain with Low Hysteresis and Boosted Energy Storage Performance under Low Electric Field in (Bi_0.5Na_0.5)TiO₃‐Based Grain Orientation‐Controlled Ceramics

Giant Field‐Induced Strain with Low Hysteresis and Boosted Energy Storage Performance under Low Electric Field in (Bi_0.5Na_0.5)TiO₃‐Based Grain Orientation‐Controlled Ceramics

Development of Cuboidal KNbO₃@α-Fe₂O₃ Hybrid Nanostructures for Improved Photocatalytic and Photoelectrocatalytic Applications