Chen Jianguo, Cheng Jinrong, Yu Shengwen, Jin Dengren, Meng Zhongyan
Department of Material Science and Engineering, Shanghai University, Shanghai, 200072, PR China.
IEEE Trans Ultrason Ferroelectr Freq Control. 2007 Dec;54(12):2637-40. doi: 10.1109/TUFFC.2007.591.
Crystalline solutions of 0.57(Bi(1-x)La(x))FeO(3)-0.43PbTiO(3) (BLF-PT) for x = 0, 0.1, 0.2, and 0.3 were fabricated by the traditional solid state reaction method. X-ray diffraction analysis revealed that the tetragonal torhombohedral phase transformation of BLF-PT occurred with an increase of the La content. The dielectric and ferroelectric properties of BLF-PT were investigated at room temperature for different La contents. BLF-PT revealed strong ferroelectric characteristics for the lower La composition, and transferred to relaxor ferroelectrics for x 0.2. The dielectric constant and remanent polarization were 1461 and 33.5 microC/cm(2), respectively, for BLF-PT of x = 0.2. The dielectric constant and polarization of BLF-PT were enhanced simultaneously with increasing La content. Our results demonstrate that BLF-PT is a competitive piezoelectric ceramic.
采用传统固相反应法制备了x = 0、0.1、0.2和0.3时的0.57(Bi(1 - x)La(x))FeO(3)-0.43PbTiO(3)（BLF-PT）晶体溶液。X射线衍射分析表明，随着La含量的增加，BLF-PT发生四方-菱面体相变。研究了不同La含量的BLF-PT在室温下的介电和铁电性能。低La组成的BLF-PT表现出强铁电特性，当x＞0.2时转变为弛豫铁电体。对于x = 0.2的BLF-PT，介电常数和剩余极化分别为1461和33.5 μC/cm²。随着La含量的增加，BLF-PT的介电常数和极化同时增强。我们的结果表明，BLF-PT是一种有竞争力的压电陶瓷。
