A study on (K, Na) NbO<sub>3</sub>based multilayer piezoelectric ceramics micro speaker

Gao, Renlong; Chu, Xiangcheng; Huan, Yu; Sun, Yiming; Liu, Jiayi; Wang, Xiaohui; Li, Longtu

doi:10.1088/0964-1726/23/10/105018

Cited by 27 publications

(9 citation statements)

References 18 publications

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“…For instance, both of them are difficult to sinter because of the high volatility of the potassium component at sintering temperatures [126][127][128], while fine grains can be acquired after densification [129][130][131]. Besides, their wonderful ferroelectric and piezoelectric properties are attractive for many real applications [93,129,130,[132][133][134][135][136][137]. For examples, in the aspect of piezoelectric materials, a flat panel micro speaker was fabricated from co-fired multilayer KNN-based piezoceramics by Chu et al [134], and BKT-and KNN-based multilayer actuators were also constructed by Nagata et al [135] and Kim et al [136].…”

Section: Other Materialsmentioning

confidence: 99%

“…Besides, their wonderful ferroelectric and piezoelectric properties are attractive for many real applications [93,129,130,[132][133][134][135][136][137]. For examples, in the aspect of piezoelectric materials, a flat panel micro speaker was fabricated from co-fired multilayer KNN-based piezoceramics by Chu et al [134], and BKT-and KNN-based multilayer actuators were also constructed by Nagata et al [135] and Kim et al [136]. In the aspect of capacitor materials, Du and co-workers developed a series of novel energy storage dielectrics based on KNN for application of pulsed power electronics [129,130,138,139].…”

Section: Other Materialsmentioning

confidence: 99%

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Advances in lead‐free high‐temperature dielectric materials for ceramic capacitor application

Jia

Hou

Zheng

et al. 2018

IET Nanodielectrics

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Ceramic capacitors with upper operating temperatures far beyond 200°C are essential for high-temperature electronics used in deep oil drilling, aviation, automotive industry and so on. Recent advances in existing lead-free dielectrics for potential high-temperature capacitor applications are reviewed and grouped into three categories according to the parent component of the solid solution. Their desirable temperature stabilities were summarised comprehensively. However, there are still some limitations in the current research, such as achieving low loss in a wide temperature range and maintaining stable dielectric properties with different frequencies or at different voltages. Furthermore, the successful implementation of multilayer ceramic capacitors is one of the biggest challenges, which will have far-reaching impacts on the realisation of high-temperature capacitor application in the future.

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Section: Other Materialsmentioning

confidence: 99%

Section: Other Materialsmentioning

confidence: 99%

Advances in lead‐free high‐temperature dielectric materials for ceramic capacitor application

Jia

Hou

Zheng

et al. 2018

IET Nanodielectrics

View full text Add to dashboard Cite

show abstract

“…Furthermore, studies of multilayer KNN-based lead-free piezoelectric ceramics with silver-palladium electrodes have been reported [74,75]. Moreover, many studies on the application of KNN-based ceramics and improving the piezoelectric properties of KNN-based ceramics have been reported [76,77,78,79,80,81,82,83,84,85,86,87,88,89]. These activities indicate that a KNN-based multilayer ceramic structure is widely considered to be a good candidate for lead-free piezoelectric devices.…”

Section: Discussionmentioning

confidence: 99%

Potassium Sodium Niobate-Based Lead-Free Piezoelectric Multilayer Ceramics Co-Fired with Nickel Electrodes

et al. 2015

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Although lead-free piezoelectric ceramics have been extensively studied, many problems must still be overcome before they are suitable for practical use. One of the main problems is fabricating a multilayer structure, and one solution attracting growing interest is the use of lead-free multilayer piezoelectric ceramics. The paper reviews work that has been done by the authors on lead-free alkali niobate-based multilayer piezoelectric ceramics co-fired with nickel inner electrodes. Nickel inner electrodes have many advantages, such as high electromigration resistance, high interfacial strength with ceramics, and greater cost effectiveness than silver palladium inner electrodes. However, widely used lead zirconate titanate-based ceramics cannot be co-fired with nickel inner electrodes, and silver palladium inner electrodes are usually used for lead zirconate titanate-based piezoelectric ceramics. A possible alternative is lead-free ceramics co-fired with nickel inner electrodes. We have thus been developing lead-free alkali niobate-based multilayer ceramics co-fired with nickel inner electrodes. The normalized electric-field-induced thickness strain (Smax/Emax) of a representative alkali niobate-based multilayer ceramic structure with nickel inner electrodes was 360 pm/V, where Smax denotes the maximum strain and Emax denotes the maximum electric field. This value is about half that for the lead zirconate titanate-based ceramics that are widely used. However, a comparable value can be obtained by stacking more ceramic layers with smaller thicknesses. In the paper, the compositional design and process used to co-fire lead-free ceramics with nickel inner electrodes are introduced, and their piezoelectric properties and reliabilities are shown. Recent advances are introduced, and future development is discussed.

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“…In this regard, several complex electronic components have been replaced with piezoelectric materials. The development of acoustic components, which are essential parts of electronic products such as communication and information broadcasting equipment, is particularly gaining in attention [ 3 , 4 ]. Currently, commercialized dynamic speakers use magnetic diaphragms and coils, which limits their miniaturization; moreover, these current-driven systems consume significant amounts of power.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric Ceramics with High d33 Constants and Their Application to Film Speakers

Kim

Lee

2021

Materials

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A multilayer piezoelectric material was fabricated using piezoelectric materials with low-temperature sintering capabilities and high piezoelectric coefficients to develop a functionally superior piezoelectric speaker with a large-displacement deformation. A soft relaxor was utilized to prepare the component materials, with the optimized composition of the investigated piezoelectric ceramics represented by 0.2Pb((Zn0.8Ni0.2)13Nb23)O3−0.8Pb(Zr0.5Ti0.5)O3. Li2CO3 was added to assist the low-temperature sintering conducted at 875 °C, which yielded a multilayer piezoelectric material with superior properties (d33 = 500 pC N−1, kp = 0.63, g33 = 44 mV N−1). A multilayer piezoelectric actuator with a single-layer thickness of ~40 µm and dimensions of 12 × 16 mm2 was fabricated by tape casting the prepared green sheets. Finite element analysis revealed that the use of a PEEK film and a smaller silicone–rubber film as a composite in the diaphragm realized optimal frequency-response characteristics; the vibrations generated by the piezoelectric element were amplified. The optimal structure obtained via simulations was applied to fabricate an actual piezoelectric speaker with dimensions of 20 × 24 × 1 mm3. The actual measurements exhibited a sound pressure level of ~75 dB and a total harmonic distortion ≤15% in the audible frequency range (250–20,000 Hz) at an applied voltage of 5 Vp.

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A study on (K, Na) NbO₃based multilayer piezoelectric ceramics micro speaker

Cited by 27 publications

References 18 publications

Advances in lead‐free high‐temperature dielectric materials for ceramic capacitor application

Advances in lead‐free high‐temperature dielectric materials for ceramic capacitor application

Potassium Sodium Niobate-Based Lead-Free Piezoelectric Multilayer Ceramics Co-Fired with Nickel Electrodes

Piezoelectric Ceramics with High d33 Constants and Their Application to Film Speakers

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A study on (K, Na) NbO3based multilayer piezoelectric ceramics micro speaker

Cited by 27 publications

References 18 publications

Advances in lead‐free high‐temperature dielectric materials for ceramic capacitor application

Advances in lead‐free high‐temperature dielectric materials for ceramic capacitor application

Potassium Sodium Niobate-Based Lead-Free Piezoelectric Multilayer Ceramics Co-Fired with Nickel Electrodes

Piezoelectric Ceramics with High d33 Constants and Their Application to Film Speakers

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A study on (K, Na) NbO₃based multilayer piezoelectric ceramics micro speaker