Effects of La concentration on the structural and dielectric properties of 0.57BiFeO3-0.43PbTiO3 crystalline solutions.
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.
Chen
Jianguo
J
Department of Material Science and Engineering, Shanghai University, Shanghai, 200072, PR China. chenjianguo@shu.edu.cn
Cheng
Jinrong
J
Yu
Shengwen
S
Jin
Dengren
D
Meng
Zhongyan
Z
D003461:Crystallography / Q000379:methods*; D017097:Electric Impedance; D007811:Lanthanum / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D008422:Materials Testing; D008968:Molecular Conformation; D012996:Solutions; D014025:Titanium / Q000737:chemistry*
D012996:Solutions; C481719:lead titanate; D007854:Lead; D007811:Lanthanum; D014025:Titanium