Phase transition temperatures and piezoelectric properties of (Bi1/2Na1/2)TiO3-(Bi1/2K1/2)TiO3-BaTiO3 lead-free piezoelectric ceramics

被引:188
作者
Hiruma, Yuji [1 ]
Nagata, Hajime [1 ]
Takenaka, Tadashi [1 ]
机构
[1] Tokyo Univ Sci, Fac Sci & Technol, Dept Elect Engn, Noda, Chiba 2788510, Japan
来源
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2006年 / 45卷 / 9B期
关键词
lead-free piezoelectric ceramics; dielectric properties; piezoelectric properties; phase transition; (Bi1/2Na1/2)TiO3; (Bi1/2K1/2)TiO3;
D O I
10.1143/JJAP.45.7409
中图分类号
O59 [应用物理学];
学科分类号
摘要
The phase transition temperatures of x(Bi1/2Na1/2)TiO3-y(Bi1/2K1/2)TiO3-zBaTiO(3)) [x + y + z = 1, y : z = 2 : 1] [abbreviate to BNBK2:1(x)] ceramics were investigated using electrical measurements. We discussed the determination of the depolarization temperature, T-d, and defined the T-d for (Bi1/2Na1/2)TiO3 (BNT)-based solid solutions. We also determined the rhombohedral-tetragonal phase transition temperatures, TR-T, for BNBK2:1(x), and verified them using dielectric and piezoelectric measurements. It was demonstrated that TR-T corresponded with T-d at x = 0.94. The existence of an intermediate phase with ferroelectric and antiferroelectric properties at temperatures higher than the T-d around the morphotropic phase boundary (MPB) was also revealed.
引用
收藏
页码:7409 / 7412
页数:4
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