Title :
A high temperature piezoelectric ceramic: (1-x)(Bi0.9La0.1)FeO3-xPbTiO3 crystalline solutions
Author :
Chen, Jianguo ; Qi, Yufa ; Shi, Guiyang ; Yu, Shengwen ; Cheng, Jinrong
Author_Institution :
Sch. of Mater. Sci. & Eng., Shanghai Univ., Shanghai, China
fDate :
9/1/2009 12:00:00 AM
Abstract :
(1-x)(Bi0.9La0.1)FeO3-xPbTiO3 (BLF-PT) crystalline solutions for x = 0.35, 0.37, 0.4, 0.43 and 0.45 have been prepared by the solid-state reaction method. The X-ray diffraction analysis shows that BLF-PT has a single perovskite phase with mixed tetragonal and rhombohedral phases between x = 0.4 and 0.43. The Curie temperature of BLF-PT for x = 0.4 attains 460degC, which is about 80degC higher than that of hard Pb(Zr,Ti)O3 ceramics. The remnant polarization and piezoelectric constant of BLF-PT for x = 0.4 reach 38 muC/cm2 and 112 pC/N, respectively. The planar coupling factor kp of BLF-PT for x = 0.4 remains stable at temperature increases of up to 360degC. The impedance spectroscopy study reveals that the high temperature conduction of BLF-PT may be attributed to the motion of oxygen vacancies within the material. Our results indicate that BLF-PT is a promising candidate for high temperature applications.
Keywords :
X-ray diffraction; bismuth compounds; dielectric polarisation; ferroelectric Curie temperature; ferroelectric ceramics; lanthanum compounds; lead compounds; piezoceramics; piezoelectricity; vacancies (crystal); Bi0.9La0.1FeO3-PbTiO3; Curie temperature; X-ray diffraction; crystalline solutions; high temperature piezoelectric ceramics; impedance spectroscopy; oxygen vacancies; piezoelectric constant; planar coupling factor; remnant polarization; rhombohedral phase; single perovskite phase; solid-state reaction method; temperature 360 degC; tetragonal phase; Ceramics; Conducting materials; Crystallization; Electrochemical impedance spectroscopy; Piezoelectric polarization; Solid state circuits; Temperature; X-ray diffraction;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2009.1255
