(BI1/2NA1/2)TIO3-BATIO3 SYSTEM FOR LEAD-FREE PIEZOELECTRIC CERAMICS
(BI1/2NA1/2)TIO3-BATIO3 SYSTEM FOR LEAD-FREE PIEZOELECTRIC CERAMICS
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DOI：
10.1143/jjap.30.2236
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发表时间：
1991-09-01
期刊：
影响因子：
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通讯作者：
SAKATA, K
中科院分区：
文献类型：
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作者：
TAKENAKA, T;MARUYAMA, K;SAKATA, K
研究了（Bi1/2Na1/2）TiO3 （BNT）基固溶体之一钡改性钛酸铋钠（Bi1/2Na1/2）1-xBax TiO3 （BNBT）作为一类新型无铅压电陶瓷的介电和压电性能。x射线数据表明，在x = 0.06约0.07处存在一个菱形(F(α))-四方（F(β)）的形态取向相边界（MPB），以及介电和压电性能。具有MPB成分的BNBT陶瓷具有较低的自由介电常数(epsilon(33)T/epsilon(0))，高机电耦合系数k(T)或k33，以及高机械强度，因此在高频超声应用中作为压电陶瓷或压电致动器材料具有优越的性能。
One of the (Bi1/2Na1/2)TiO3 (BNT)-based solid solutions, Ba-modified bismuth sodium titanate, (Bi1/2Na1/2)1-xBax TiO3 (BNBT), is studied for its dielectric and piezoelectric properties as a new group of lead-free piezoelectric ceramics. A rhombohedral (F(alpha))-tetragonal (F(beta)) morphotropic phase boundary (MPB) is shown to exist at x = 0.06 approximately 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, epsilon(33)T/epsilon(0), and a high electromechanical coupling factor, k(t) or k33, along with high mechanical strength.