NDLI: Lead-free piezoelectric ceramics based on perovskite structures

Content Provider	SpringerLink
Author	Takenaka, T. Nagata, H. Hiruma, Y. Yoshii, Y. Matumoto, K.
Copyright Year	2007
Abstract	The piezoelectric properties of a solid solution based on three components of bismuth sodium titanate (Bi$_{1/2}$Na$_{1/2}$)TiO$_{3}$ (BNT), bismuth potassium titanate, (Bi$_{1/2}$K$_{1/2}$)TiO$_{3}$ (BKT), and barium titanate, BaTiO$_{3}$ (BT), that is x(Bi$_{1/2}$Na$_{1/2}$)TiO$_{3}$−y(Bi$_{1/2}$K$_{1/2}$)TiO$_{3}$−zBaTiO$_{3}$, [ $$ x + y + z = 1 $$ , abbreviated as BNBKy:z(x)] and potassium niobate, KNbO$_{3}$ (KN) based ceramics, that is KN+MnCO$_{3}$ x wt.%, [abbreviated as KN−Mn x], were studied as a lead-free piezoelectric material. In the case of BNBK2:1 system, high piezoelectric properties were obtained near the MPB composition, and the highest electromechanical coupling factor, k $_{33}$ and piezoelectric constant, d $_{33}$, were 0.58 for BNBK2:1(0.89) and 181 pC/N for BNBK2:1(0.88). Nevertheless, the depolarization temperature, T $_{ d }$, shifts to lower temperature around the MPB compositions, and the T $_{ d }$’s of BNBK2:1(0.88–0.90) are only about 100 °C. On the tetragonal side, the T $_{ d }$ shifts to higher temperature with increasing the lattice anisotropy, c/a. As T $_{ d }$ higher than 200 °C was obtained in the range of x < 0.78, with a k $_{33}$ and d $_{33}$ for BNBK2:1(0.78) being 0.45 and 128 pC/N, respectively. In the case of Mn doped KN ceramics, dense and non deliquescence KN ceramic were successfully obtained via ordinary firing technique in air by optimizing the fabrication process. Mn doping for KN ceramics was effective to obtain full poling state easily under poling conditions of high temperature and high electric field. As a result, we obtained the excellent piezoelectric properties of k $_{33}$ = 0.507 for KN−Mn0.2.
Starting Page	259
Ending Page	265
Page Count	7
File Format	PDF
ISSN	13853449
Journal	Journal of Electroceramics
Volume Number	19
Issue Number	4
e-ISSN	15738663
Language	English
Publisher	Springer US
Publisher Date	2007-02-24
Publisher Place	Boston
Access Restriction	Subscribed
Subject Keyword	Lead-free piezoelectric ceramics Piezoelectric constant Electromechanical coupling factor Ferroelectric properties Depolarization temperature Crystallography Electrochemistry Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Methods Optical and Electronic Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Ceramics and Composites Mechanics of Materials Materials Chemistry Condensed Matter Physics Electrical and Electronic Engineering

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