School of Material Science and Engineering, Shanghai University, Shanghai, China.
IEEE Trans Ultrason Ferroelectr Freq Control. 2009 Sep;56(9):1820-5. doi: 10.1109/TUFFC.2009.1255.
(1-x)(Bi(0.9)La(0.1))FeO(3-x)PbTiO(3) (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 460 degrees C, which is about 80 degrees C higher than that of hard Pb(Zr,Ti)O(3) ceramics. The remnant polarization and piezoelectric constant of BLF-PT for x = 0.4 reach 38 microC/cm(2) and 112 pC/N, respectively. The planar coupling factor k(p) of BLF-PT for x = 0.4 remains stable at temperature increases of up to 360 degrees C. 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.
(1-x)(Bi(0.9)La(0.1))FeO(3-x)PbTiO(3) (BLF-PT) 晶体溶液，x = 0.35、0.37、0.4、0.43 和 0.45，通过固态反应法制备。X 射线衍射分析表明，BLF-PT 具有单一的钙钛矿相，在 x = 0.4 到 0.43 之间具有混合四方相和菱方相。x = 0.4 的 BLF-PT 的居里温度达到 460 摄氏度，比硬 Pb(Zr,Ti)O(3)陶瓷高约 80 摄氏度。x = 0.4 的 BLF-PT 的剩余极化强度和压电常数分别达到 38 μC/cm(2)和 112 pC/N。x = 0.4 的 BLF-PT 的平面耦合系数 k(p)在高达 360 摄氏度的温度升高下保持稳定。阻抗谱研究表明，BLF-PT 的高温传导可能归因于材料内部氧空位的运动。我们的结果表明，BLF-PT 是高温应用的有前途的候选材料。
