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Materials 2015, 8(11), 7423-7438; doi:10.3390/ma8115389

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

Murata Manufacturing Co., Ltd., Nagaokakyo, Kyoto 617-8555, Japan
These authors contributed equally to this work.
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Academic Editor: Lorena Pardo
Received: 29 September 2015 / Revised: 26 October 2015 / Accepted: 28 October 2015 / Published: 3 November 2015
(This article belongs to the Special Issue Piezoelectric Materials)
View Full-Text   |   Download PDF [3074 KB, uploaded 3 November 2015]   |  

Abstract

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. View Full-Text
Keywords: ferroelectric material; potassium sodium niobate; (K,Na)NbO3; piezoelectric actuator; base metal inner electrode; multilayer structure ferroelectric material; potassium sodium niobate; (K,Na)NbO3; piezoelectric actuator; base metal inner electrode; multilayer structure
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kawada, S.; Hayashi, H.; Ishii, H.; Kimura, M.; Ando, A.; Omiya, S.; Kubodera , N. Potassium Sodium Niobate-Based Lead-Free Piezoelectric Multilayer Ceramics Co-Fired with Nickel Electrodes. Materials 2015, 8, 7423-7438.

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