Jpn. J. Appl. Phys. 30 (1991) pp. 2236-2239  |Next Article|  |Table of Contents|
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(Bi_1/2Na_1/2)TiO₃-BaTiO₃ System for Lead-Free Piezoelectric Ceramics

Tadashi Takenaka, Kei-ichi Maruyama and Koichiro Sakata

(Received May 27, 1991; accepted for publication July 20, 1991)

One of the (Bi_1/2Na_1/2)TiO₃ (BNT)-based solid solutions, Ba-modified bismuth sodium titanate, (Bi_1/2Na_1/2)_1-xBa_xTiO₃ (BNBT), is studied for its dielectric and piezoelectric properties as a new group of lead-free piezoelectric ceramics. A rhombohedral (F_α)-tetragonal (F_β) morphotropic phase boundary (MPB) is shown to exist at x=0.06∼0.07 by X-ray data, and dielectric and piezoelectric properties. BNBT ceramics with the MPB composition are superior as piezoelectric ceramics in high-frequency ultrasonic applications or as piezoelectric actuator materials because of a lower free permittivity, ε₃₃^T/ε₀, and a high electromechanical coupling factor, k_t or k₃₃, along with high mechanical strength.

URL: http://jjap.jsap.jp/link?JJAP/30/2236/
DOI: 10.1143/JJAP.30.2236
KEYWORDS:piezoelectric ceramics, lead-free, relaxor, bismuth sodium titanate, (Bi_1/2Na_1/2)TiO₃-based, mechanical strength

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