Large‐Amplitude piezoelectric properties of KNbO−3‐based lead‐free ferroelectric ceramics. Issue 3 (15th February 2013)

• Record Type: Journal Article
• Authors: Nagata, Hajime; Takenaka, Tadashi
• Is Part Of: Electronics and communications in Japan. Volume 96:Issue 3(2013:Mar.)
• Page Start: 53
• Page End: 58
• Publication Date: 2013-02-15
• Subjects: Electronics -- Periodicals; Telecommunication -- Periodicals; 621.6805
• DOI: 10.1002/ecj.10416
• Languages: English
• ISSNs: 1942-9533

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>High‐power piezoelectric characteristics of Mn‐ doped KNbO<sub>3</sub> (KN + MnCO<sub>3</sub> at <italic>x</italic> wt%, <italic>x</italic> = 0 to 0.8 wt%, KN‐Mn<italic>x</italic>) ceramics are reported for the first time in this paper. The mechanical quality factor <italic>Q</italic><sub>m</sub> of KN‐Mn<italic>x</italic> ceramics at small‐amplitude vibration increased with the Mn content, and the <italic>Q</italic><sub>m</sub> of KN‐Mn0.8 ceramic reached about 820. The maximum vibration speed <italic>v</italic><sub>o−p</sub>, about 2.3 ms, was obtained for KN‐Mn0.8 with <italic>Q</italic><sub>m</sub> = 820. <italic>Q</italic><sub>m</sub> for large‐amplitude vibration in KN‐Mn0.8 and Pb(Zr, Ti)O<sub>3</sub> (PZT)‐based ceramics (N6) decreased with increasing <italic>v</italic><sub>o−p</sub>. <italic>Q</italic><sub>m</sub> of KN‐Mn0.8 was smaller than that of N6 for small‐amplitude vibration. However, for large‐amplitude vibration at which <italic>v</italic><sub>o−p</sub> > 0.6 m/s, the <italic>Q</italic><sub>m</sub> value of KN‐Mn0.8 was larger than that of N6. These results indicate that KN‐based lead‐free piezoelectric ceramics possess superior mechanical stability for large‐amplitude vibration. This is a very good sign for high‐power piezoelectric applications. © 2013 Wiley Periodicals, Inc. Electron Comm Jpn, 96(3): 53–58, 2013; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/ecj.10416</p> </abstract>